Abstract
Archaeological sites in Upper Egypt, especially Edfu Temple, are considered a wealth of human civilization and are irreplaceable. Deterioration of archaeological sites due to environmental changes in Edfu city include disintegration and exfoliation of stones, dissolution of building materials, loss of moral paintings, crystallization of salts in walls and columns, stone bleeding, destruction of wall paintings and texts, decreasing of durability of monumental stones, and discolouring. Recently, the archaeological field has received a lot of interest from Remote Sensing (RS) and Geographic Information Systems (GIS) users to observe the impact of environmental changes on archaeological sites during long periods. CORONA, LANDSAT, and SENTINEL-2A satellite images are our tools in detecting the changes around the study area and creating innovative solutions. Results from the analysis conducted suggest that most of the environmental changes in the study area are caused by uncontrolled urban sprawling and rising groundwater levels due to agricultural and urban expansion. The proximity of agricultural lands to archaeological areas has also affected the rise in groundwater levels. This has also played an important role in the transfer of chemical contaminants with the leaking water of soil to these archaeological sites, resulting in the growth of salt crystals. In this research, the environmental hazards and their effects are being observed for the archaeological sites of Edfu city (Upper Egypt). A comprehensive analysis has been conducted for the Horus Temple considering its building material, soil characteristics and environmental setting. Finally, we have created some models to protect the archaeological sites from environmental changes by the integration of remote sensing and GIS techniques.
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1 Introduction
Many years ago; Egypt was rich in movable cultural items such as artifacts, as well as immovable cultural heritage monuments such as historical and artistic sites. Like many of the developing countries in Africa; urban sprawling and agricultural expansion are a real phenomenon in Egypt. The increasing danger to the temples around the banks of the Nile due to increasing groundwater rises as a result of agricultural and urban expansion [1,2,3]. The Nile Valley of Egypt is one of the oldest agricultural areas in the world and has been under continuous cultivation for at least 5000 years [4,5,6,7]. These lands became completely too permanent irrigation after the building of the High Dam, where water is available at any time during the year, generating two or three crops each year [8, 9]. The protection of cultural heritage sites is a significant issue specifically for lands subject to a long period of human activity, possibly adversely influencing heritage properties and their environment thus degrading or altering the historical landscape and archaeological features.
The hydrological and hydrochemical analysis of groundwater alongside the historical and archaeological research studies are important applications in studying cultural heritage management and the effect of groundwater on archaeological sites [10,11,12,13,14,15,16,17,18,19,20,21,22,23,24]. Remote sensing indices, hydrogeological settings, and spatial autocorrelation analysis are considered effective methods of detecting the environmental changes around archaeological areas. Finally, the integration of remote sensing and geographic information system techniques will allow us to establish some of the archaeological sites’ protection models [25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42].
Remote Sensing (RS) and Geographic Information System (GIS) allows cultural resource managers, historians, planners, and engineers to catalogue and assess the organizational and structural patterns of such sites, and determine sustainable tourism and urban development options within their regions [43,44,45,46] Early remote sensing applications in archaeology started in the 1920s [47]. In archaeology, aerial photography was primarily used to view features on the surface of the earth, which is difficult if not impossible to visualize from ground level [48]. Today the remote sensing technique is used as an operational technique for the identification of archaeological surface and underground remains [49, 50] as well as for the documentation, monitoring, and preservation of cultural heritage sites [53].
Change detection of the environmental is a dynamic method related to landscape change driving forces such as the environment, geography, and many others that affect the archaeological sites on multiple spatial and temporal scales. Understanding and analysing these driving forces and their interrelationships are a major topic. Also, the temporal components of spatial urbanization and rising groundwater levels can be more simply identified through GIS and remote sensing models [54]. In particular, the availability of low-cost, high-resolution satellite images permits the acquisition of data covering large areas, including the same areas over multiple periods up to a recent perspective of the landscape. On the other hand, the development of these techniques has advanced archaeological site documentation in a rapidly urbanizing system, investigating the looting process and supporting guide archaeological preservation works [55]. Remote sensing offers a trusted significant source of information, and methods are being developed for small and large-scale operational detecting of environmental problems [56]. However, additional in situ samples and reference field spectra can aid in finding new techniques and test not only the accuracy of the final image analysis output [57]. The scientific satellite radar data for archaeological studies was possible owing to increased availability started in the early 1990s of Synthetic Aperture Radar (SAR) imagery in the Remote Sensing Agencies [58]. Together with surface surveys, remote sensing data can collaborate to form a better image of the present and prehistoric landscape cultural heritage locations [59]. Nowadays, Optical, radar data, and GIS techniques are used to develop zoned archaeological hazard maps that will guide planners and developers regarding the importance of archaeological remains across the cities and where building activity should be strictly regulated or allowed [60].
Spatial analysis and geographic information system techniques are important techniques that can be used for predictive models in preventive archaeology. Each of these techniques can play a major role in archaeological studies in the Decision Support System (DSS) and in providing useful data to reduce archaeological risks. In this research, the main aim of the study is to identify various causes of deterioration, and the factors and mechanisms affecting the Horus Temple from the different groundwater effects.
1.1 Study area
On the west bank of the Nile, Edfu city is situated in Upper Egypt about 100 km south of Luxor [61]. Its large temple (Horus) from the Ptolemaic age (about 300–30 BC) is dedicated to the falcon-headed god Horus, making it a famous city [62]. The temple is considered to be one of the most impressive holy buildings and the best-preserved temple of Egyptian antiquity. The construction activities started in about 237 BC and ended in 57 BC, after one hundred eighty years [63, 64] (Fig. 1a, b, c).
1.2 The archaeological description of the temple
The Temple is dedicated to Horus, the Behdetite [65], a falcon god who is usually worshiped as a man with the head of a falcon [66]. The temple is important because it’s large and well-preserved [67]. The inscriptions that cover the walls of Edfu Temple are considered the most valuable sources on Ptolemaic Egypt; they offer a wealth of information, mainly about religion, also administration, political history, and other topics [68]. The Edfu inscriptions transmit ideas that come from the oldest epochs of Pharaonic history [69]. Furthermore, the temple inscriptions can be taken as a compendium of the Egyptian lifestyle [70, 71]. Three main phases are observed in the temple building, the original nucleus, itself a complete temple with a hypostyle hall [72], two other halls, a sanctuary, numerous side chapels and the third, the forecourt foundations, the stone enclosure wall, and the pylons. However, until 57 B.C, the decoration of the temple does not appear to have been completed, and the great doors of the pylon were not hung [73]. The whole temple took about 180 years to complete. This impressive building lay within a vast enclosure oriented from south to north. Before the Pylon, there were originally two masts and an obelisk which no longer exists now. Over the main door and between the wings of the Pylon was the Balcony of the Falcon, reached between the Forecourt by stairs in the eastern side of the Pylon [74]. With a colonnade of thirty-two columns to south, east, and west, and with two doors in each of its east and west walls, the Forecourt was a vast uncovered court. On the north side of the Forecourt lay the Pronaos or Outer Hypostyle, the great court as it was most commonly called. It was both higher and wider than the rest of the temple to the north of it and contained twelve enormous columns. The south wall was composed of a screen wall, about half the height of the hall, with three engaged columns on either side of the entrance [75, 76]. The north wall of the Central Hall was occupied by the facade of the Sanctuary and the doors of the corridor that surround it. The sanctuary or Holy of Holies was surrounded by the sanctuary, and separated from it by a corridor [77, 78], (Fig. 2a and b).
1.3 Problem definition
The most important temple site deterioration factors are the Nile flow, agricultural drainage, low-level location, and surrounding urban sewage. Most of the historical structures (Pharaonic, Greco Roman, and Islamic periods) have been dependent on the limestone as an essential building material for long periods in Lower and Upper Egypt. Many of the limestone monuments have suffered serious damage due to various deterioration factors in Egypt [79] (Fig. 3). Also, the geological setting is one of the top deterioration factors in the study area that include four stratigraphic formations (Edfu, Esna shale, Armant and Issawia Formations) (Fig. 4a). The temple belonged to the Cretaceous period [80] and was built on a hill of silt and clay, the study area was situated through the alluvial plains of the Nile, surrounded by dense plateaus covered by Eocene calcareous and Paleocene shale (Fig. 4b, c).
Egypt is one of the arid zones of North Africa with two main freshwater systems; the River Nile and groundwater [81]. The groundwater system in the study area is highly influenced by the irrigation system, unplanned urban sprawling and the Nile flow. Groundwater quality around the Horus temple is characterized by a high salinity index [82]. Also, soil characteristics are an important factor that must be studied to detect the groundwater effects on the temple structure, also the types of salts in the soil and their proportions to decide how these components pose a danger to the archaeological remains. On the other hand, we can derive the effect of water suction pressure migrating through the building foundations (estimated by 4–5 m from ground surface) by capillary rising (defined by 12.30%), and the evaporation rate on the wall surface according to the dominating relative humidity, and air temperature [83].
2 Material and method
2.1 Data collection
To study the groundwater flow and direction and their impact on the temple site, we have collected the geological map with scale 1; 500 [84] hydrogeological map with scale1:100:000 [85, 86] and Digital Elevation Model extracted from Shuttle Radar Topography Missio (SRTM) to detect the watershed and drinage water system in the study area. Also, we have downloaded and analyzed satellite images from the USGS Earth Explorer and GLCF (Corona (May 1968), Landsat TM (May 1983), Landsat TM (May 1992), Orbview-3 (May 2004) and Sentinel-2A (May 2019)) (Table 1) to detect urban and agriculture expansion.
3 Methodology
The hydrological, geological maps analysis and satellite images interpretation were carried out with ArcGIS 10.1 and ENVI 5.1 software to detect the changes in the urban and agriculture areas—based on past and immediate data. The layer stacking, dark subtract, geometric correction, unsupervised classification, supervised classification, post-supervised classifications techniques were carried out using Envi software. Digital Elevation Model of the studied area was generated from the elevation points and the vector contour line (obtained from topographic map scale 1:50,000) using Arc Map V.9.3 software. The main aim of using the topographic maps, or the SRTM DEM data in such case, was to detect the most appropriate areas to put the pumps that will work to collect the groundwater around the archaeological areas. That’s because the topographic maps have the contour lines and the high spots layers that help the researchers in detecting the most significant areas (high or low elevated areas). So, according to the extracted digital data from the topographic maps, we can choose the optimal points for the pump-lines that will collect the groundwater around the archaeological areas. The 2D Elevation model and the watershed have been carried out by Soil & Water Assessment Tool (SWAT) model. Spatial distribution was analysed by Getis-Ord and Hot Spot statistic using Arc GIS software. Recently, many studies have used these tools to detect the amount of urban, agriculture, sprawling areas around the frost and archaeological areas to protect these areas [87,88,89,90]. For the present study; the available raster data were firstly converted into vector polygon data to make use of statistical analysis available for vector data. The extracted data were put in separate shapefile layer. The final step is to detect the Getis-ord and Hot spot statistics for all the included vector layers including; agriculture and urban areas through using the Getis-Ord statistic tool, and the Hot Spot tool in ArcGIS software. The calculating of Getis-Ord GI* can be given according to the following statistical equations [91].
where \({\mathrm{x}}_{\mathrm{i}}\) is the attribute value for feature \({\mathrm{j}}_{,}{\mathrm{w}}_{\mathrm{ij}}\) is the spatial weight between feature \(\mathrm{i}\) and \(\mathrm{j},\mathrm{n}\) is equal to the total number of features and:
The \({\mathrm{G}}_{\mathrm{i}}^{*}\) statistic is a % -score so no further calculations are required.
Band indices techniques have been derived using the built-up and vegetation expressions.The Normalized Difference Built-up Index (NDBI) method enabled to map the built-up and bare land in the study area, according to the following equations [92]:
We also used the Normalized Difference Vegetation Index (NDVI) method to determine whether or not the target being measured includes live green vegetation. The NDVI index depends on the combination of the bands 3 and 4 in TM, and 4, 8 in Sentinel 2, as in the following formula [93].
4 Results and discussions
According to the Digital Elevation Model (2D and 3D) and SWAT analysis tool, the temple is situated between 88 and 91 m elevation. It's observed that the direction of the inclination from the southeastern to the northwestern side. Also, the temple is situated inside a basin, and this situation indicated that one of the reasons for rising the groundwater level in the temple area (Fig. 5). To clarify hydrological impacts on the archaeological sites must study hydrochemistry of groundwater and their impact on the temple-bearing soil and archaeological building materials. Figure 6 shows the strategy to study the effect of groundwater levels rising in the temple area. This strategy will support the preservation and protection plan for the study area.
4.1 Hydrological impacts on the archaeological sites
There are various environmental factors that might impact archaeological sites. Hydrological processes are considered one of these factors which influence the contained soil and can lead to land deterioration. In the present study, the impacts of hydrological processes, represented by groundwater chemical characteristics, on bearing soil and building material of Edfu archaeological site were investigated. Deterioration of groundwater quality (e.g. high levels of salinity) can lead to soil salinization and corruption of the temple building materials. In the upcoming sections, the evaluation of hydrological processes and their impacts on soil and buildings on Edfu template will be discussed.
4.1.1 Hydrochemical properties of groundwater
Groundwater hydrochemical properties include characteristics of groundwater aquifers, groundwater resources, and their chemical and physical compositions.
Groundwater aquifers in the study area are represented by two hydrologically connected aquifers which are the semi-confined aquifer, and the unconfined aquifer which covers the lower range of the Nile River [94, 95]. The semi-confined aquifer consists of two layers, the upper layer of the clay–silt, which is characterized by its low permeability and reaches between 0.4 and 1 m/day and an average thickness of 8 m. As for the lower layer, it is sand and gravel. The thickness of this layer is 150 m. This layer is the main groundwater aquifer in the Nile Valley. The depths of groundwater in the aquifer vary between 3 and 100 m and the thickness of the aquifer layers is between 25 and 60 m. The volume of water drawn annually from the underground aquifer is about 602,456 cubic meters, so the study area is one of the largest areas in the exploitation of groundwater [96, 97].
Groundwater resources come not only from the Nile River, but also from fossil sources various resources include irrigation water, agricultural drainage, and wastewater [98]. The proximity of the Edfu Temple to the Nile River and the construction of the High Dam raised the groundwater level, where large amounts of water were stored behind the dam, leaking from it and leaching into the main underground aquifer, and in turn leaking irrigation water into the soil [99].
Those who have studied the Egyptian monuments [100,101,102,103,104] report that the danger threatening the archaeological buildings is the salts transferred from the groundwater to the soil supporting the monuments and the most lethal salts discovered in this groundwater are: Sodium Chloride, Sodium Sulfate, Sodium Nitrate, Sodium Carbonate and the hydrogen ion concentrations (pH) (Table 2).
Twenty-three samples from underground wells in various locations in the study area were collected and analyzed. The samples were stored in well dried clean plastic bottles which were filled with water; leave no air in, to avoid change in the partial pressure of CO2. The bottles were labeled with waterproof markers and then they were brought directly to the laboratory for analysis. Sodium contents were determined using flame photometer technique. Other cations were measured using a spectrophotometer. Chloride and sulphate concentrations were determined calorimetrically and bicarbonate concentration was determined by titration method. The concentration of trace elements (Fe+ + , Mn ++) was determined using a spectrophotometer. It was found that Potassium, Carbonate, Chlorides, hydrogen ion concentrations (pH) and Electrical Conductivity (EC) were greater than the World Health Organization standards for safety [105] (Table 3). There is also a relationship between the Total Dissolved Solids (TDS) in groundwater and pH [106]. An increase in the pH of groundwater indicates an increase in the percentage of their salt content.
4.1.2 Groundwater impact on the temple-bearing soil
The characteristics of the soil bearing the monuments were studied (mechanical and chemical analysis) to identify the types and sources of salts in the soil and how these salts represent a danger to the archaeological buildings.
Ten samples of the temple-bearing soil were collected from the soil profiles and the mechanical analysis by sieve method showed that the average percentage of coarse grain size (very coarse sand, coarse sand, and medium-coarse sand) was about 40.35% total samples sizes. As for fine sand, it reaches 6.63% and clay reaches about 54.2% which suggests the temple-bearing soil is vulnerable and could cause the temple to fall [107].
Four soil samples were obtained for the chemical analysis (Dissolved salts). Based on the results, the soil analyzed contains a high proportion of soluble salts in water, which in turn leads to soil fragility and disassembly, especially when exposed to rain or a rise in groundwater. Calcium sulfate salt is present in soil samples because the soil was infused with a large proportion of calcium-containing gypsum, which is a low-harm element when compared to rapidly dissolved sodium chloride salts in water, which cause deterioration of archaeological buildings. Dissolved salts in the soil represent a real danger to archaeological buildings, and the higher the salt content in the soil, the greater the risk to the archaeological buildings above this soil. The most important sources of salts found in the soil are chemical fertilizers, salts resulting from the improper use of the materials used for the restoration of monuments and from the decomposition of plants and fungi in the soil [108].
4.1.3 Groundwater effect on the archaeological building material
Limestone is considered the major material of archaeological buildings, whether Pharaonic, Greek, Roman, Coptic or Islamic and is largely due to the abundance of limestone in the study area (11 limestone quarries in Sohag Governorate) [109]. Limestone is affected by the surrounding environmental conditions, which appears in the body of the wall, and the colors in drawings and inscriptions [110].
Mineral composition of limestone is mainly calcium carbonate with a small percentage of magnesium, silica, shale, and iron. It is considered the best limestone in a building contains a small percentage of fossils [111]. Some of the minerals inside the rock lead to the formation of low-soluble salt compounds in water such as limestone, which originally consists of calcite and dolomite (calcium carbonate or magnesium carbonate) but they turn into high-soluble salt compounds when connected to water (rainwater or groundwater) and this represents a geomorphological threat to the monuments, although its effect appears in the long term.
4.1.3.1 Change detection (Landuse/landcover)
Five satellite images were downloaded at different times from the same area (May 1968, 1983, 2002, 2004, and 2019) to detecting urban encroachment and changes in the vegetation value in the same agriculture season of the year. The classified images of the five dates were used to calculate differences in the areas cover and observe the changes that occurred in the span of data. In more detail, the analysis of Corona, Landsat TM 4, 5, Orbview-3, and Sentinel-2A imagery revealed that the urban area increased by about 261.8 m2 from 1968 to 1983. However, the urban area also increased by about 231.6 m2 from 1983 to 1992. In the same direction, the urban area increased also about 138.7 m2 from 1992 to 2004, and finally, the built-up area increased by about 1.532.6 m2 from 2004 to 2019 (Table 4). These changes proved that urban sprawling presented the main direction in the chronology of the changes. The biggest change in the built-up area occurred in the urban area around the temple (Fig. 7a, and b).
On the other hand, the spatial distribution by Getis-Ord statistic and Hot Spot analysis tools showed a Hot Spot area in 1968 present in the east-northern side from the temple. This means that the danger from the built-up area wasn’t high. Later, the Hot Spot transferred from the temple to the northern and eastern sides in 1992. This means that the development in the built-up area became more dangerous. In the next era, 2004, the Hot spot area presented directly beside the temple. A new stage is highly affected by the greatest risk that appeared in 2019 when the Hot Spot area surrounded the temple from all sides (Fig. 8a, b, c, d, and e, respectively).
The result of the built-up (Fig. 9a, and b), and the vegetation indices (Fig. 10a, and b), proved that the changes between the 1984 and 2019 images in the built-up area focused around the temple area in the north-eastern side, were enormous.
5 Recommendation
Besides the high risk of digging around the temple walls, the ancient method for collecting the groundwater will lead to movement and change in the environment status under the temple which would cause a lot of problems for the archaeological builds. The groundwater table will become lower. The total effect will be that the risk of salinisation will increase. Groundwater is always moving forcibly by gravity from recharge to discharge areas. Groundwater movement in most areas is slow—a few feet per year but in more permeable zones such as channels in the limestone, movement can be as much as several feet per day (https://www.pubs.usgs.gov/gip/gwruralhomeowner/) (Fig. 11).
Remote sensing models can be used to detect and decrease the environmental risks around the archaeological sites according to UNESCO rules. UNESCO gave some suggestions that can use around the heritage sites to protect these sites and to create perfect archaeological map include the service regions around these sites. Also, some researchers put some new recommendations for protecting cultural heritage sites such as some engineering systems [112,113,114]. The suggested model includes three boundaries around the temple to examine the current building near the temple. It is believed that the right approach to handling the situation is the application of the concept of “biosphere reserves “ as proposed and adopted by the UNESCO Man and Biosphere Program (MAB). This objective can be made by a “Zonation System” in the Edfu area that applies different management policies to different zones. Generally, the definition of the Zonation system is the system that composite from some areas that can put around the heritage sites for protecting against the environmental risk such as groundwater, urban or agriculture sprawling etc., We have many and many environmental status, so we have the opportunity to change the buffer line distances. On the other hand, we have many kinds of heritage sites, so the same situation as the environmental status. For example, in Egypt we have many archaeological sites in North (Irrigated area), South (Irrigated and desert areas). So, according to the environmental setting, we can choose the distance between the buffer zones. But generally, we have not standard distance for every kind of the environmental setting. UNESCO has identified the buffer zone around the archaeological sites to be 100 m. Generally, the buffer zone is identified on basis of the surrounding activities considering the anthropogenic and environmental conditions. Edfu Template is surrounded by built-up and agricultural areas, thus the buffer zone is proposed to be decreased from 100 to 50 m with stiff control to minimize the impact the might result from the activities in these regions. The first area is sited between the archaeological temple and core area (monitoring). The second area is between the buffer zone and core area including research, education, and training station and human settlements. Finally, the third area is between the buffer zone and transition zone (tourism and recreation) (Fig. 12).
The surrounding area of the temple is affected by agricultural drainage and built-up sewage. The GIS model is created to implement the subsurface drainage system around the temple. This model proposes collecting groundwater by choosing some points as trenches (Fig. 13). The suggested points will collect the water slowly; this water will be collected by the pump line connected finally with the water recycling station (Fig. 14).
6 Conclusion
In this study, multisource satellite images, hydrogeological and geological data set were used and operationally applied for investigating the environmental risks around Edfu Temple. Results of the present study showed that urban sprawl on account of the agricultural lands represent the main source inducing the environmental degradation in the areas surrounding the archaeological sites. Both of them strongly influence the distribution in the levels of groundwater which are considered the main causes of the deterioration process affecting the Temple. Processing of multi-temporal satellite imagery provided the necessary information on anthropogenic and natural activities around the archaeological sites which helps to sustain these resources. The joint analyses of the outputs from the diverse disciplines along with in situ investigations provide the current environmental conditions and their interrelationships with the temple deterioration. For mitigation measures, the present study adopted an integrated approach based on remotely sensed data processing, archaeological, hydrological and geological analyses to propose practical innovative solutions to conserve the historic sites.
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A.Megahed, H. Hydrological and archaeological studies to detect the deterioration of Edfu temple in Upper Egypt due to environmental changes during the last five decades. SN Appl. Sci. 2, 1952 (2020). https://doi.org/10.1007/s42452-020-03560-x
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DOI: https://doi.org/10.1007/s42452-020-03560-x