Abstract
Results of extreme precipitation trend analysis, at different spatial and temporal scales, have become alarming since the last century, due to the global climate change. This work describes the impact of climate change on the distribution and trend of maximum daily rainfall in the Macta watershed. Monthly maximum rainfall data that were collected over 41 years (1970 to 2010) on 41 stations were used to validate the present research. The extreme values of rainfall maxima (200 to 264 mm/d) are located in the northeastern part of the basin during the spring season. From 1992 onwards, shifts are observed from monthly, seasonal in addition to significant annual trends. Monthly, seasonal, and annual rainfall maxima trend analyses were identified using three methods, which are Mayer’s adjustment method, Şen’s innovative method (2012), and the Bravais-Pearson test. The study found out a downward trend during the first period (1970–1992). On the other hand, the second period (1992–2010) revealed significant upward trends. Climate change affects all regions except the center part of the study basin.
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Introduction
The warming of the global climate system is unequivocal (IPCC 2007, 2013). Today, the questions, such as “Does the climate change”? “Will the earth warm up?”, no longer arise. Changes in weather and climate extremes impact and pose serious challenges for societies (CCSP 2008).
The analysis of extreme weather events related to climate change is one of the biggest challenges facing the scientific community because they have a major impact on the physical environment and the socio-economic sector (Kostopoulou and Jones 2005). Water resources, agriculture, ecosystems, forestry, health, insurance, and industry are some of the most studied sectors (Parry et al. 2004). The extreme climate associated with temperature and precipitation can also affect energy consumption, human comfort, and tourism (Henderson and Muller 1997; Weisse 1998; Subak et al. 2000).
Several studies have been done on extreme rainfall trends (Caloieroa et al. 2016; Carvalho et al. 2014; Keggenhoff et al. 2014; Westra et al. 2012; Brugnara et al. 2012; Lopez-Moreno et al. 2011; Shang et al. 2011). There is substantial empirical and climatological evidence that extremes of precipitation increased during the twentieth century and that this trend is expected to continue with global warming (Mannshardt-Shamseldin et al. 2010).
Understanding the spatial and temporal variability of extreme precipitation plays an important role in the management of water resources, particularly in flood mitigation and prevention. Knowledge of the distribution of spatio-temporal trends in extreme precipitation is crucial for hydrological flood control models using retention pond systems (Bellu et al. 2016) or surface water storage using rainwater harvesting systems (Terêncio et al. 2018; Terêncio et al. 2017). Sustainable protection-utilization plans must be implemented to ensure the sustainability of natural, historical, tourism, and cultural resources (Cetin et al. 2018a, b).
Recent years have seen a change in the rainfall pattern of daily rainfall in terms of frequency and intensity in some parts of the world. The findings of Min et al. (2011) and Westra et al. (2012) on extreme rainfall showed that nearly two-thirds of global rainfall stations have increasing trends. For instance, trends in annual maximum precipitation have increased in three regions studied in Brazil (Carvalho et al. 2014). Groisman et al. (2005), Sharad and Kumar (2012), and Sharad et al. (2017) have shown that the change observed in the rainfalls’ intense frequency evolution in the world is greater than that observed in annual totals. Studies on extreme rainfall in the Mediterranean basin do not all converge towards the same results. Kioutsioukis et al. (2010) analyzed the extreme rains in Greece over the period (1955–2002) and found a decrease in their intensities. Alpert et al. (2002) showed an increase in extreme daily rainfall in Italy, Spain, and Cyprus during the period (1951–1995) associated with a decrease in total annual rainfall. Martinez et al. (2007) analyzed the variability of daily rainfall in the Catalan region of north-eastern Spain over the period (1950–2000) and showed a downward trend in daily extreme rainfall number.
The analysis of the Gorakhpur resort in India with a long data series reported the highest 24-h precipitation (2001 to June 2013) with an alarming increase in intensity. These events can be associated with regional warming and signal of the climate change effects on the region (Pandey 2014). Keggenhoff et al. (2014) showed slightly increasing trends in extreme daily rainfall in Georgia during the period 1971–2010. For monthly rainfall, there was a decreasing trend in the Per River Basin in China (Deng et al. 2018) and in Mediterranean areas (Elouissi et al. 2016; Longobardi and Villani 2009).
Seasonal accumulations of intense precipitation have decreased significantly in north-central Algeria, northern Italy, parts of southern France and Spain, and northern Portugal. Some of these observations are reported in several works (Alpert et al. 2002; Klein Tank and Kônnen 2003; Brunetti et al. 2005; Kostopoulou and Jones 2005; Lopez-Moreno et al. 2011). Donat et al. (2014) indicated a different result, i.e., a significant increase in intense cumulative precipitation over northern Algeria. Tramblay et al. (2013) suggested no significant trend in seasonal accumulations of rainfalls intense in northern Morocco or more widely throughout the Maghreb. Shang et al. (2011) did not find a significant trend in the extreme rainfall records in northwestern Ethiopia.
During the 1990–1999 decade, which experienced a decrease in annual rainfall, floods became natural disasters resulting in numerous human casualties and extensive material damage in 1996 and 1998 in particular (Goula et al. 2007).
Like many continents in the world, Africa is experiencing the ravages of climate change, the mastery, and risk assessment of which depend in part on the knowledge and understanding of daily extreme rainfall (Ague and Afouda 2015).
Algeria, a Mediterranean country mostly located in semi-arid and arid zones, has always been confronted with droughts and extreme floods (Bekoussa et al. 2008; Meddi and Hubert 2003; Meddi et al. 2009), which constitute a real challenge to economic and social development. Algeria is among the countries at high climate change risk. It is ranked at as 59, with a World Risk Index (WRI) of 7.76% (United Nations University 2017). The WRI index is calculated based on natural factors, such as earthquakes, floods, and drought, on the country’s susceptibility to disaster, coping skills, and the strategy of adaptation.
In this context of divergent results of the works cited above, on the one hand, and the impact of climate change and meteorological hazard on the other hand, this study analyzes the maximum daily, seasonal, and annual precipitation (MDP) in the North West of Algeria. One objective of this paper is to map the monthly, seasonal, and annual maximum daily rainfall collected on 41 stations during the period 1970–2010 in the Macta watershed (North-West Algeria). Another objective is the study of rainfall maxima series in order to identify the trends.
Study area
The study area is located in the Macta watershed, northwestern Algeria. Its geographical position is between − 1.25° west and 0.60° east in longitude and between 34° and 36° north in latitude. The Macta is a basin that covers an area of 14,410 km2. It is limited in the north-west by the mountain ranges of Tessala, in the south by the highlands of Maalif, in the west by the plateaus of Telagh and in the east by the Saida Mountains (Djediai 1997). The Macta basin is bordered in the north by the Mediterranean Sea, to the south by the mountains of Saida (1201 m) and Daya Mountains (1356 m), and to the southwest by the mountains of Tlemcen, including the mountains of Beni Chougrane and the plain of Mohamadia (Meddi and Toumi 2013). The average annual rainfall is rather low, which varies from 206 mm on the southern part of the Beni Chougrane Mountains (Bouhnifia and Sfisef) to 380 mm on Saïda Mountains and the northwestern part of Sidi Bel Abbes and Tessala Mountains (Elouissi et al. 2017). However, the spatial variation of average rainfall is moderate (25%). The Macta watershed is drained by two major rivers, which are El-Hammam Wadi in the east and Wadi Mekkera (called Wadi Mebtouh downstream), in the west (Fig. 1).
Data and methods
Data
The daily maximum precipitation data (DMP) (in mm) were collected by the National Office of Meteorology at Oran (ONM) and the National Agency for Water Resources (ANRH). Stations with high gap rates were discarded; only the stations with a gap rate not exceeding 10% were selected (Meddi and Assani 2014). Thus, 41 stations that have been selected are spread over all regions of the Macta watershed (Fig. 2). The observation period of these time series is 41 years (1970–2010). The selected rainfall stations are symbolized numerically (for example, Ras El Ma: 110102, Mascara: 111429).
Control and homogeneity of the data
Standard methods for the detection of point or systematic anomalies in data series (in particular, the analysis of cumulative regression residues between a reference variable deemed reliable and the variable to be tested) cannot be applied here because of the extreme nature of the rainfall variables (monthly daily maxima). Nevertheless, the graphical adjustment of the maximum annual rainfall to a statistic distribution of extreme events can at least visually prejudge the reliability of the data by the erroneous values (Berolo and Laborde 2003).
Adjustment of daily maximum precipitation to a probability distribution
The Gumbel distribution has long been the most used model for estimating quintiles. Koutsoyiannis (2004) showed that the application of Gumbel’s law can lead to a poor estimate of risk by underestimating the greatest extreme values of rainfall, especially when the series have a few decades of data and cannot have the same distribution as the actual one. Thus, many researchers prefer the generalized extreme values (GEV) law to Gumbel’s law for modeling maximum annual rainfall (Wilks and Cember 1993; Chaouche et al. 2002; Koutsoyiannis 2004; Onibon et al. 2004). The difference between quantiles estimated by the Gumbel law and the quantiles by the GEV law is considerable and can be two to three times larger (Muller 2006).
The extreme value theory has been used for the development of methods describing the behavior of extreme values, that is to say the points farthest from the mean. The widespread distribution of the extreme value-GEV shows great descriptive and predictive abilities to capture the asymmetry and kurtosis common to the data, without any prior constraints. It is robust in estimating quantiles of distribution and makes predictions on the return level (Mannshardt-Shamseldin et al. 2010; Zalina et al. 2002; Alentorn and Markose 2005).
The distribution function of the Jenkinson (1955) GEV law is expressed by Eq. (1):
where μ, σ > 0, and ξ are the location, scale, and shape parameters, respectively.
Figure 3 shows an example of extreme rainfall adjustment to the GEV law.
Description of the data
After detecting outliers (anomalies) and filling gaps, Fig. 4 shows the evolution of the annual extreme precipitation of the 41 stations of the Macta watershed during the period (1970–2010).
The statistical parameters of maximum annual rainfall are shown in Table 1.
According to Table 1, the maximum daily extreme rainfall values vary between 118.3 mm/day (Ras El Ma station: 110102) located south of the basin and 263.7 mm/day (Nesmoth MF station: 111418) located at East of the basin.
The variability of extreme rainfall is important. It is minimum (maximum) that appears at the Matemore (Trois Rivières) station with station number 111405 (111516) with a coefficient of variation of 27% (48%). The variation in the standard deviation varies between 21.5 (Matemore: 111405) and 50.8 (Nesmoth MF: 111418).
The analysis of Fig. 4 shows that the majority of the 41 stations converge to minimum values closer to the medians of the series. So, there is a dispersion of the annual maxima values at the beginning and the end of the time series, hence, the possible existence of a breaking in these series. The detection of a break in the series makes it possible to highlight the evolution of the rainfall regime in the study region (Meddi et al. 2009). The minimum value of the cumulated maximum rainfall of the 41 stations corresponds to the year 1992, the probable date of climate change. Blanchet et al. (2018) identified this approximation of values for annual rainfall maxima between 1980 and 1990 in southern France, with 1985 as the most likely.
The innovative method of Şen (2012) and Mayer’s is to split the time series into two equal periods, but as we suspect the existence of a break in these series, we then cut these series into two unequal periods following this suspicious year (1992): period I (1970–1992) with n = 23 years and period II (1992–2010) with n = 19 years.
Study of maximum daily precipitation trends
Nowadays, the effects of global climate change have been remarkably perceived, and thus, the determination of precipitation trends has become crucial for water source planning and the engineering phases of future projects.
Several methods are used for trend detection including Bravais-Pearson r, Spearman rho (SMR), Mann-Kendall tau (MK), Sen method (1968), innovative method of Şen (2012), and the test of cumulative rank difference (CRD) (Onyutha 2015).
The analysis adopted in this article is inspired by three methods: Mayer’s adjustment method, Şen’s innovative method (Şen 2012), and the Pearson-Bravais test. It consists of the following steps:
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1.
Cut the time series of daily maximum precipitation (monthly, seasonal, and annual) in two (02) periods: period I and period II.
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2.
Correlate daily rainfall maxima over time (years) for both periods I and II.
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3.
For each period, estimate extreme rainfall trends by calculating the Bravais-Pearson correlation coefficient (r) and the regression slope (a). The correlation coefficient r is between − 1 and + 1 (Armatte 2001). The linear correlation coefficient between two characters X and Y (denoted r) is calculated by means of Eq. (2).
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If r tends to 1, there is a strong positive linear correlation between x and y.
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If r tends to 0, there is no linear correlation between x and y; they are independent.
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If r tends to − 1, there is a strong negative linear correlation between x and y.
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4.
Test the significance of the Bravais-Pearson r coefficient by the Student’s test at the significance level α. Statistical measures of trend involve testing the null hypothesis, H0 (that there is no trend) against the alternative hypothesis, H1 (that there is a trend). For a level of significance α, the correlation coefficients r were evaluated following the Student’s t distribution. If the magnitude of the coefficient r is significantly greater (lower) than zero, the alternative hypothesis must be accepted. The positive or negative trend is indicated by the sign of the slope (Helsel and Hirsch 1993). The statistic of the Student’s test is calculated by Eq. 3.
The critical value (rejection of the null hypothesis) of a unilateral risk test α is given as
The trend of each series is determined by the classification of Westmacott and Burn (1997) (see Table 2):
Results and discussions
Mapping maximum daily precipitation
The purpose of the map plot is to represent the spatio-temporal variability of MDP during the period 1970–2010. The density of rain gauges is never sufficient to reflect the variability of precipitation at a fine spatial scale (Laborde 1984; Weisse 1998). Mapping makes it possible to evaluate the spatial variability of possible future results from descriptive statistics (Berthelot 2008). It is also possible to specialize punctual information.
The geostatistical approach (Kriging) was adopted after identifying the space structure based on the values measured in the stations (Hevesi et al. 1992).
Kriging is a stochastic method of spatial interpolation that estimate the value (s) of the regionalizd variable under study sampled by a combination of data at the point measures while taking into account the distance and degree of variation between them (Baillargeon 2005). It is a linear unbiased estimation method and minimizes the estimation variance (Lawin et al. 2012).
It was used in this study the ordinary Kriging which is the more frequently used (Gratton 2002).
The first step is to build the experimental variogram and estimate its model. The second step is to use the model variogram for determine the weights of the samples that will be used for Kriging.
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(a)
Monthly maxima maps
Figure 5 shows the maps of daily rainfall maxima for the 12 months:
- The months January and February are characterized by a homogeneous distribution of extreme rainfall over the whole basin, which varies between 40 and 150 mm/day. Only a small area in the eastern part is marked by heavy rain, up to 230 mm/day.
- For the months March and April, the heaviest extreme rainfalls tilt towards the west of the basin (220 mm/day). The rest of the basin preserves the trend compared to previous months.
- The month of May has the same distribution as the two previous months except that the intensity of the rainfall is distinguished by its peak (263.7 mm/day at the station Nesmoth HF (111418) for the year 1970).
- The months of June, July, and August show a homogeneous distribution of low daily rainfall maxima ranging from 10 to 100 mm/day. Higher values (up to 160 mm/day) begin to appear in the south of the basin during the month of September.
- For the months of October, November, and December, extreme rainfall increases in intensity (100 mm/day to 240 mm/day) throughout the basin with high values in the center and north.
(b)Seasonal maxima maps
The following interpretations can be made as for the seasonal maxima series:
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In the summer, the daily rainfall maxima map (Fig. 6) shows a homogeneous distribution of rainfall ranging from 10 to 100 mm/day.
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The autumn season (Fig. 6) is characterized by an increasing trend of extreme values especially in the center of the basin (100 mm/day to 220 mm/day).
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In winter, the highest values move north and east with the same intensity of autumn (100 mm/day to 220 mm/day).
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In the spring, the highest values of extreme rainfall (263.7 mm/day) occur east of the watershed.
(c)Annual maxima map
The values of daily extreme rainfall maxima fluctuate annually between 100 and 264 mm/day. The lowest rainfall of annual maxima occurs mainly in the south of the Macta Basin (Fig. 7) despite their geographical locations with maximum watershed altitudes. For example, the stations Ras El Ma (110102) and Ain El Hadjar (111103) with respective altitudes of 1105 m and 1097 m recorded daily maximum rainfall of magnitudes 100 mm/day to 160 mm/day. On the other hand, the highest rainfall of annual maxima is distributed in the North and East of the basin with minimum altitudes. For example, the station Marais de Sirat (111616), which is next to the Mediterranean Sea with only 30 m of altitude, records a maximum daily rain of 220 to 240 mm/day. The Nesmoth MF (111418) station at 930 m altitude recorded a maximum daily rainfall of 250 mm/day. Maximum daily rainfall values between 180 and 264 mm/day occupy 2/3 of the basin.
A linear regression was established between annual rainfall maxima and altitude, which resulted in an insignificant correlation.
Temporal variation of trends
The temporal analysis of the trends of the daily rainfall maxima of the Macta watershed over two periods (1970–1992 and 1992–2010) was carried out on a monthly, seasonal, and annual scale. Table 3 presents the trend categories according to the values of r, the series size n, and α value (Westmacott classification).
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(a)
Monthly trends
The methodological approach cited above was applied in our Macta watershed study on extreme monthly, seasonal, and annual precipitation. Two graphical adjustments are obtained for the two periods I (in blue) and II (in red) with correlation coefficients (r) and slopes of the adjustment lines (a) as shown in Fig. 8.
The results obtained for the monthly maximum daily precipitation trends are shown in Table 4.
The comparison between the two periods I and II allows to deduce that the 7 months of February, March, April, June, July, August, and September do not show perceptible changes. Climate change has affected exclusively the months of January, May, October, November, and December.
The remaining 5-month trends have shifted from non-trend or moderate decline (period I) to strong or moderate growth (period II).
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(b)
Seasonal trends
Figure 9 presents the trends of daily extreme rainfall maxima recorded during the four seasons of the year.
The winter and spring seasons (Table 5) have shifted from the sharp decline (period I) to the high growth (period II). Autumn switches from non-trend (period I in blue) to strong growth (period II in red). Summer maintains the no trend case both periods. In general, 3/4 or (75%) of seasons are affected by climate change.
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(c)
Annual trend
The analysis of the annual trend of maximum daily rainfall is shown in Fig. 10.
Climate change appears clearly as in Table 6, where the shift from the sharp decline (period I) to the high growth (period II) has been noted.
Spatial variation of trends
The same scientific approach was applied in space on 41 rainfall stations in the Macta watershed for maximum annual rainfall extremes. The results are presented in Table 7.
Figure 11 shows the spatial variation in annual maximum precipitation trends for the 41 stations during the two periods:
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1.
Period I (1970–1992): Here, 14 stations have a strongly decreasing trend (SDT) and 4 stations have a moderate decreasing trend (MDT) (Table 7). About 44% of the stations have decreasing trends in the north and east of the basin (Fig. 11a). On the other hand, 23 stations (56%) show no significant trend (NST) and are located in the center and south parts of the study area.
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2.
Period II (1992–2010): This period is characterized by a totally opposite situation to the first, that is to say that the significant upward trend appears in 26 stations (63%), divided between moderate (MIT) and strong (SIT) (see Fig. 11b). The growing stations are distributed over all regions of the basin. About 37% of the stations show no significant trend (NST) and they are in the center of the basin.
In Fig. 11, we find that Pearson’s correlation coefficients r move upward from the first to the second period. This situation is in perfect agreement with Fig. 7, which presents the distribution of the annual maxima of daily extreme rainfall. This implies the predominance of the trends of the second period on the first one.
The results of this study detect significantly increasing trends in extreme monthly, seasonal, and annual precipitation. Paradoxically, Elouissi et al. (2016) detected a decreasing trend of total precipitation in the same watershed during the period 1970–2011.
These results converge with the work of several authors (Caloieroa et al. 2016; Brugnara et al. 2012; Alpert et al. 2002; Brunetti et al. 2001), who detected a paradoxical increase in the extreme precipitation records, despite a decrease in totals, in different areas of the Mediterranean basin.
Faced with different behavior of the extreme rains in the Mediterranean basin, we reiterate the suggestion of Reiser and Kutiel (2011) who propose a detailed regional analysis.
Conclusion
The purpose of this study is to analyze the time series of daily maximum precipitation, to map and to detect significant trends. The study was conducted in the Macta watershed, and the following points are significant for consideration in any future project in the study area.
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(a)
The spatiotemporal distribution of daily extreme rainfall maxima releases values ranging from 118.3 to 264 mm/day. Their locations in the basin switch from 1 month to the next. The most extreme season is spring with 263.7 mm/day rainfall. The most extreme values are located in the North and East of the basin. The coefficients of variation vary between 27 and 48%.
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(b)
Among all years, 1992 was detected as a break-up date with the shift in monthly, seasonal, and annual trends from decline to significant growth.
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(c)
The first period (1970–1992) is characterized by a significant decrease in the trend in the months of March, April, May, and December. The winter and spring seasons show significantly decreasing trend. Annually, 18 stations (44%) have significantly decreasing trends and they are located in the North and East of the basin. On the other hand, 23 stations (56%) have no significant trend. None of the stations has shown a growing trend.
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(d)
The second period (1992–2010) shows a situation opposite to the first one. It implies significant growth in 5 months (January, May, October, November, and December) trends and three seasons (winter, spring, and autumn). It is obvious that the climate change affects all regions except the center of the basin. Annually, 63% of the stations have significantly increasing trends in the north, east, and even south of the watershed.
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The authors thank the National Water Resources Agency (ANRH) for the availability of data. The authors thank Professor Zohair Chentouf (King Saud University (KSA)) for his linguistic advice.
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Benzater, B., Elouissi, A., Benaricha, B. et al. Spatio-temporal trends in daily maximum rainfall in northwestern Algeria (Macta watershed case, Algeria). Arab J Geosci 12, 370 (2019). https://doi.org/10.1007/s12517-019-4488-8
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DOI: https://doi.org/10.1007/s12517-019-4488-8