Abstract
Conventional statistical methods for estimating recurrent intervals of the flood are less reliable due to the unavailability of recorded discharge data for a longer period. It can only be possible through palaeohydrological analysis along with sedimentological and geomorphic investigations. In the palaeohydrological study, palaeodischarge is calculated using slackwater deposits (SWD). These are the natural records of overbank megaflood deposits. In the present study, the SWD remain preserved in a natural levee section of the lower Ramganga river catchment wherein seven discrete megaflood events were identified. According to the calculated palaeodischarge stage (top elevation of each slackwater deposits layer), the palaeofloods events were reconstructed. The palaeodischarge of these floods was estimated which ranged from 2664.72 m3/s to 4121.46 m3/s. From recorded discharge data, the flood frequency was calculated by using Log Pearson type III distribution. The grain size analysis was carried out through the Malvern Mastersizer-S analyser. The slackwater deposits were differentiated clearly with slope clastic deposits by the grain size distribution.
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3.1 Introduction
Flood frequency analysis (FFA) using historical or gauging discharge records is considered as quite insufficient for the precise estimation of flood frequency and its magnitude. The longest gauging records (usually much less than 100 years) are also too short to provide trustworthy prediction for extreme flood events. Therefore, in order to understand the flood behaviour of any channel it is necessary to receive long-term records of the floods. It can only be possible from the sedimentary archives preserved in the flood plain region (Yang et al. 2000). The palaeoflood data provides long-term natural records of the flood histories (Baker 2008). By using this data, palaeoflood hydrological estimation can be made a long with sedimentological and geomorphological investigations. The flood frequency, magnitude and recurrent interval of mega floods spanned over the decades to thousands of years preserved as palaeoflood deposits can improve the FFA by enhanced fitting of the probability functions (Webb et al. 1988; Thorndycraft et al. 2003; Benito et al. 2004).
The palaeoflood hydrology is the interdisciplinary science of reconstructing past flood events (Baker 1987, 2008). It plays an important role in the temporal analysis of flood and channel response to palaeoenvironmental change, planning for mitigation of flood hazard and protection of hydraulic engineering construction (Zha et al. 2009a, 2015; Zhou et al. 2016). According to Baker and Kochel (1988), ‘Palaeoflood hydrology combines a multidisciplinary approach (stratigraphy, sedimentology, geomorphology and hydraulics) in the study of past or ancient floods, to decipher, quantitatively, past flood discharges, extending the record of extreme floods from centuries to thousands of years’. Benito and Thorndycraft (2005) opined that in the palaeofloods study, the term palaeo has promoted to common fallacy that it is only used for estimating very old floods that occurred in the geological period. However, most of the palaeoflood hydrological analyses encompasses the study of prehistoric, historic or modern floods in ungauged basins. This study has been popularized widely around the world since the past four decades because of long-term natural records of high magnitude floods that provide better insight on the following issues: (i) risk assessment of extreme flood events; (ii) determination of extreme limit of flood magnitude; (iii) channel responses of flood in various hydroclimatic settings; (iv) assessing the sustainability of floodwater in dry climatic region (Knox 2000; Benito et al. 2003; Benito and Thorndycraft 2005; Baker 2006; Zha et al. 2009b).
The techniques for palaeohydrological analysis do not incorporate the direct measurement or observation of the flood. Instead, by applying numerous flood-induced marks on the landscape which are derived from channel features associated with floods or flood deposits, various indirect indices can be implied. These indices are applied to measure the palaeoflood, e.g., flood velocity, discharge and flood stage levels (Stokes et al. 2012). It is very useful for ungauged drainage systems or where the documentation of systematic records is short or not properly maintained.
Over the past four decades, the palaeoflood slackwater deposits (SWD) have been utilized as a robust tool for palaeohydrological research. This study has been successfully conducted in the United States (Baker 1983; Ely and Baker 1985; Enzel et al. 1994; O’connor et al. 1986, 1994; Wang and Leigh 2012; Greenbaum et al. 2014); Spain (Benito et al. 1998, 2003) China (Yang et al. 2000; Huang et al. 2012; Fan et al. 2015; Li et al. 2015; Zha et al. 2015; Mao et al. 2016) and in India (Kale et al. 1994, 1997, 2000, 2003, 2010; Sridhar 2007).
Although slackwater deposits are found in all climatic conditions at different geomorphic settings, most specifically its presence is marked in the arid and semi-arid region (Baker and Kochel 1988; O’Connor et al. 1994; Baker 2006). The rivers located in these regions are often experienced with very high rainfall for a short span of time. The heavy torrential rainfall generates a high flood situation, accompanied by heavy sediment load coming from the unconsolidated and uncovered sediment deposits (Hirschboeck 1988). During high flood situations, the sediment loads were deposited at or near the channel margin. These deposits were reworked by the channel with the passage of time. The rainfall, runoff, bioturbation, human and animal interference also cause damage to the primary sedimentary deposits. Apart from the arid and semi-arid regions, the SWDs are quite well preserved in the tropical region also (Ely et al. 1996; Kale et al. 2003, 2010; Kale 2008). It has been found that low to medium magnitude overbank flood deposits are more susceptible for undercutting and subsequent flow. Only the deposits of megaflood events remain in situ and probably preserved for a longer period (Ely et al. 1996).
According to Kale (2008), there is a low to moderately low chance of getting palaeoflood slackwater deposits in the Gangetic Plain region. This region is heavily populated and large-scale agricultural practices are going on since ~5000 years near the river. Apart from that, the incidence of high magnitude flow causes frequent channel migration which brings inconsistencies in the successive records of flood deposits. In spite of such hindrances, if the researchers conduct a thorough field survey along the probable locations specifically in the Western Gangetic plain region, they may definitely get the well-preserved SWD data (Mukherjee 2019). The rivers located in the Western Gangetic plain region are incisional in nature and less dynamic than the Eastern Gangetic plain rivers (Sinha et al. 2005). In the incised channel, the flood deposits can be easily traced than the aggrading channel. Besides, there is a preponderance of partly confined channels in the western Gangetic plain region from where one can archive recurrent flood deposits. In the present study, palaeodischarge has been estimated on the lower Ramganga river, located in the Western Gangetic plain. The uncontrolled and unscientific growth of the human population in this river catchment has increasingly been posing the risk of flood on the human habitation as well as in the infrastructural development. Therefore, palaeoflood hydrological analysis can be fruitful for flood assessment, risk analysis, flood plain planning and management. The aims of the present study are as follows:
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i.
to describe and quantify extreme flood events using historical flood data;
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ii.
to discuss pedo-stratigraphic characteristics of palaeoflood slackwater deposits;
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iii.
to reconstruct extreme flood events using stratigraphic records of palaeoflood slackwater deposits;
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iv.
to estimate palaeoflood peak discharge by employing slope-area method.
3.2 Study Reach
The Ramganga river catchment is located in the Lesser and Outer Himalayas as well as in the Western Gangetic plain (Fig. 3.1). It drains an area of 30,635.1 km2 (Mukherjee et al. 2017). The river originates from the Lesser Himalaya, near Gairsen, Uttarakhand. After flowing ~167.91 km in the Himalayas, the Ramganga river debouches the Western Gangetic plain. The total length of this river is ~649.11 km and it is a right-bank tributary of the Ganga river. The present study reach is located in Western Gangetic Plain locally known as Rohilkhand Plain. The study area is comprised of quaternary alluvium, namely: (i) Varanasi older alluvium (ii) Ramganga terrace alluvium and (iii) Ramganga recent alluvium, (Khan and Rawat 1992; Khan et al. 2016).
The Varanasi older alluvium is found in upland interfluves surface, sandy alluvial ridges, and older terrace surface (Fig. 3.2). The older and dissected terrace plain, inactive floodplains are composed by the Ramganga terrace alluvium and the Ramganga recent alluvium closely corresponds with active and younger floodplains (Mukherjee et al. 2017). The lower reach of the Ramganga river is unconstrained as a result of that frequent channel migrations are more common. The channel pattern alternates between meandering to partly braided types. At several places, high-curvature meandering channels are observed. The river is also characterized by higher stream power (Sinha et al. 2005; Mukherjee 2019). The fluvial regime of this river is largely controlled by the monsoon climate. This river catchment receives more than 80% of annual rainfall in the monsoon season (June to September). During this period, large floods are more common in the lower reaches of the catchment area (Fig. 3.3). Because of higher stream power, presence of easily erodable bank materials and fragile foundation of the natural levees, the floods become extremely hazardous in this study reach.
3.3 Database and Methodology
The present analysis has been done by using extreme flood discharge data and palaeoflood slackwater deposits (Fig. 3.4). The sources of data collection are given in Table 3.1.
3.3.1 Flood Frequency Analysis by Log-Pearson Type III Distribution
For flood frequency analysis, the annual extreme discharge value was taken into consideration. The Log Pearson III distribution was used to estimate probable extreme flood frequencies of the Ramganga river. This measure is extensively applied for FFA to the major tropical rivers as it fits most appropriately to estimate flood peaks. This method involves first converting the variate into logarithmic form and then analyzing the transformed data (Subramanya 2013). Mukherjee and Bilas (2019) assessed the flood frequency of the lower Ramganga river by applying Gumbel’s, Log-Pearson Type III, and Weibul’s method, where it has been found that the Log-Pearson Type III is the most appropriate measure for FFA.
For calculating flood frequency of the lower Ramganga river by using Log-Pearson Type III distribution, the following steps were followed.
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(i).
At first, all the annual maximum flood discharge value was transformed into logarithms by using Eq. 3.1:
$$Y=log x$$(3.1) -
(ii).
Then, the mean (\(\overline{y })\), standard deviation (\({{\varvec{\sigma}}}_{{\varvec{y}}}),\) and skewness coefficient (\({C}_{s}\)) of y series were estimated as
$$\overline{y }= \frac{1}{n}\sum {y}_{i}$$(3.2)$${\sigma }_{y}=\boldsymbol{ }\sqrt{\sum (y- \overline{y }{{)}^{2}}/(N-1)}$$(3.3)$${C}_{s}\boldsymbol{ }\boldsymbol{ }=\boldsymbol{ }\frac{N\sum {(y-\overline{y })}^{3}}{\left(N-1\right)\left(N-2\right)({{\sigma }_{y})}^{3}}$$(3.4) -
(iii).
The logarithms of extreme flood discharge were computed using the equation
$$5{Y}_{T }=\overline{y }+ {K}_{T}{\sigma }_{y}$$(3.5)The frequency factor \({K}_{T}\) is a frequency factor that is a product of the return period and skewness coefficient
$${K}_{T}=f({C}_{s},T)$$(3.6) -
(iv)
After calculating \({y}_{T}\) by Eq. (3.5), the extreme flood discharge value was obtained by antilogarithm of \({Y}_{T}\) is
$${X}_{T}=antilog \left({y}_{T}\right)$$(3.7)
3.3.2 Palaeoflood Hydrological Investigations
For palaeohydrological estimates of the lower Ramganga river, the methodological steps instructed by Benito and Thorndycraft (2005) were followed, which includes the following:
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(i)
For selecting suitable sites for palaeoflood slackwater deposits, a detailed study of topographical maps and satellite images of the lower Ramganga river catchment was carried out.
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(ii)
On the basis of that study, the most suitable sites of SWD were marked. A detailed field survey was conducted on those sites for identifying the presence of stratigraphic layers of slackwater deposits or other flood indicators.
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(iii)
The most prominent site was identified on a natural levee section where pedological and stratigraphic characteristics remain well preserved. The stratigraphic descriptions were made on the identified palaeoflood slackwater deposits.
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(iv)
The samples of flood deposits were collected for sedimentological analysis.
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(v)
A topographic survey was conducted on the selected SWD site and river reaches.
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(vi)
Estimation of hydraulic variables and palaeodischarge was carried out on the selected site.
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(vii)
A comparison was made with available historical or gauging records of the flood discharge
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(viii)
Flood frequency analysis was done.
In the present study, a geomorphic and sedimentological investigations were carried out in order to identify palaeoflood stage and estimate the frequency and magnitude of past megaflood events. In this study, the main objective of the fieldwork was to identify the palaeoflood stage (PFS). Then the PFS was converted into palaeoflood peak discharge. The reconstruction of PFS is dependent on the evolution, thickness, and attitude of the palaeoflood slackwater deposits (SWD) (Li et al. 2015). Basically, the top of the slackwater deposits can be extrapolated to estimate the PFS. Various river scientists used the elevation of the endpoints of palaeoflood SWD, which is in contact with the upper slope as PFS (Yang et al. 2000; Zha et al. 2009b; Wang et al. 2014).
The palaeodischarge was calculated by using slackwater deposits. These deposits were identified on the field based on several sedimentological criteria: (i) sediment deposits consisting silt, and silty-sand; (ii) abrupt vertical change in sediment grain size, colour, texture, and structure; (iii) clear division between successive stratigraphic layers; (iv) clay cap over the bed; (v) bioturbation which indicates exposure of sediment surface; (vi) existence of anthropogenic remains; (vii) presence of slope wash with angular clastic alluvial deposits between stratigraphic layers (Baker and Kochel 1988; Kale et al. 2000; Benito et al. 2003; Benito and Thorndycraft 2005; Thorndycraft et al. 2005; Sridhar 2007; Zhang et al. 2013, 2015).
After extensive field investigation, the most prominent SWD was found near Rampur Bajhera village in the Hardoi district of Uttar Pradesh (Fig. 3.5). Here a well-developed natural levee is present whose deposits did not get disturbed by burrowing animals or by anthropogenic activities. The natural levee Sect. (27̊ 29′26″, 79̊ 43′00″) has ~3.5 m elevation above the normal level of Ramganga. After observing the multi-temporal satellites and topographical maps it becomes evident that the region has remained relatively stable for the past 100 years. The stratigraphic records that remain preserved at the natural levee section were measured accurately. For palaeohydraulic investigation, the cross-section was measured in the field by using theodolite.
The palaeopeak discharge was reconstructed by using the slope area method of streamflow measurement (Manning, 1889). It was calculated as
where Q = Palaeoflood peak discharge (m3/s),
n = Manning’s n value or roughness value,
A = Cross-sectional area of the stream at the flood stage,
R = Hydraulic radius,
S = Water surface slope.
3.3.3 Grain Size Measurement
The sediment samples collected from a stratigraphic layer of the natural levee were measured using the Krumbein and Pettijohn (1938) standard pipette method. The size of the sand, silt and clay particles were measured using a Malvern Mastersizer-S analyser. But before that CaCO3 and organic matter contents were removed from the collected samples by providing pre-treatment with 10% HCl and 10% H2O2 solution.
3.4 Result and Discussion
3.4.1 Hydrological Characteristics
The Ramganga river is a spring-fed river and most of its tributary channels are either spring or groundwater fed. Hence, a majority of the water discharge of Ramganga and its tributary channels derives from the monsoon rainfall (Mukherjee and Bilas 2019). The monthly average discharge data (2003–2012) of Lower Ramganga river at Dabri gauging station (27° 53′ 1″ N and 79° 54′ 44″E) has been plotted in Fig. 3.6. It depicts the typical monsoon discharge of a river. It starts to rise from July and reaches a maximum in September and then declines from October. Every year, July to October is designated as the period of higher water discharge and it reaches an extreme level in August and September.
3.4.2 Estimation of Probable Flood Discharge and Flood Recurrence Interval
The flood frequency analysis is a statistical technique used to understand flood behaviour of any river. On the basis of that flood, forecasting can be made for a longer time period. This analysis involves the use of peak annual discharge to calculate probable flood discharge and its recurrent interval. The average of the observed peak discharge data is 1603.05 m3/s and the standard deviation (SD) is 383.11 m3/s. For Log-Pearson type III distribution, the mean and SD values of peak discharge are 3.193 and 0.105, respectively. For Log-Pearson III methods, frequency factor (\({K}_{T}\)) has been used for measuring the peak flow. The calculation of various parameters for peak flow measurements at various recurrent intervals has been given in Table 3.2. It shows 2128.54 m3/s for 10 years recurrent intervals, 2739.7 m3/s for 100 years, and 3295.51 m3/s for every 1000 years recurrent intervals.
3.4.3 Estimation of Palaeohydraulic Flood Discharge Using Slack Water Deposits
For palaeoflood studies, the palaeodischarges of the basin have been calculated by marking the palaeostage indicators (PFS) (Baker et al. 1979). Flood exceeding a certain threshold has been registered through sedimentary records or other ‘palaeostage indicators erosional landforms (stripped soils, flood scarps, high flow channels), and high-water marks (e.g., drift wood, tree impact scarps, silt lines)’ (Benito et al. 2003). The slackwater deposits (SWD) are formed by the material brought by flood and vertically accrete overbank. The top elevation of each slackwater deposit is considered as a palaeostage (Kochel and Baker 1982; Baker et al. 1983; Baker 1989). During the period of flood, fine-grained suspended sediments accumulate rapidly in a vertical sequence, where an abrupt drop of flow velocity occurs. When such a phenomenon occurs at the recurrent interval, a series of subsequent stratigraphic layers of slackwater deposits have been formed. These layers are generally separated by slope clastic deposits.
In the natural levee section, seven major palaeoflood events were recorded (Figs. 3.7 and 3.8). The PFS of each palaeoflood event was measured. Along with that, channel cross-sectional area, wetted perimeter, river gradient and hydraulic radius of the channel on both sections were measured most accurately. By using the slope-area method, the maximum palaeoflood discharge was estimated as 4121.46 m3/s whereas the minimum value was recorded as 2664.72 m3/s (Table 3.3).
3.4.4 Stratigraphy and Grain Size Analysis of Slackwater Deposits
In the natural levee section, total of 17 stratigraphic layers are observed. The pedo-stratigraphic descriptions have been given in Table 3.4. Out of which seven layers are designated as palaeoflood slackwater deposits. These layers are clearly visible and distinguishable from other layers. The colour of these deposits varies from yellow to orange. The concentration of silt to silty sand particles is higher, parallel to wavy laminations are found.
The grain size analysis was done in order to differentiate slackwater deposits from other sediments, to identify the proportion of sandy silt and clay deposits and also to distinguish the nature of their frequency distribution and degree of sorting. In the present stratigraphic section, all of the palaeoflood slackwater deposits are characterized by a higher degree of silty-sand concentration and they are well sorted (Table 3.5). The mean grain size of these deposits is ranged between 28.10 µm and 39.71 µm. The deposits of silty sand to coarse sand are predominantly higher in B2, B4 and D2 slackwater deposit layers. It demonstrates high energy flow and vertical accretion of the larger particles. The concentration of the coarser and unconsolidated materials is relatively higher in the upper stratigraphic section. The palaeosols are characterized by clay to clayey-silt deposits. On the other hand, in the recent soil deposits coarser silt and sand deposits predominate. The mean grain size increases in the upper section. The largest concentration of the clay and clayey-silt is found in the lowermost part of the stratigraphic section. Apart from that, the concentration of such materials is higher in B3, B5 and D3 layers,0 which are lying just above the layers of slackwater deposits. It depicts the period of low magnitude flood deposits. The values of kurtosis reveal that all of the deposits are characterized by platykurtic distribution. Its value increases in the upper layer deposits. All of the sediment distributions are positively skewed.
3.4.5 Accuracy Assessment
Based on present-day channel geometry and flood stage indicator the peak discharge of the 2011 megaflood has been estimated by applying the slope area method, i.e., 4396.81 m3/s. The extreme flood discharge recorded as 4650.78 m3/s in Dabri gauging site on 23 August 2011. On that day, the water level reached 138.515 m. It is considered that such magnitude of flood has never been experienced since the past 100 years (Mukherjee 2019). This gauging station of the lower Ramganga river, lying ~1.80 km upstream of the present surveyed section. The gauging record of extreme discharge of the 2011 flood closely corresponds to the present estimation.
3.5 Conclusion
The research on the palaeohydrological events has been carried out for temporal analysis of extreme flood behaviour in terms of its magnitude and recurrent interval and also to explain channel responses to such extreme floods in a particular reach of the river catchment. This kind of research might be very effective for floodplain planning and flood risk management, because if we know the extreme flood magnitudes, the flood inundation zone can be designated. On the basis of that long-term effective measures for flood adaptation and community resilience can be made. In the present paper, the magnitude and frequency of palaeofloods and historical flood events were reconstructed using palaeoflood slackwater deposits combined with a hydrographic survey, sedimentological analysis and instrumental records of floods.
The hydrological characteristics of the Ramgangariver are largely governed by the monsoon climate. For flood frequency analysis, annual peak discharge data has been used. To observe the chance of peak discharge of a certain magnitude of flood for lower Ramganga river Log-Pearson III distribution has been attempted. For 10–50 years of the recurrent interval of the flood, the peak discharge ranged from 2128.54 m3/s to 2565.34 m3/s for Log-Pearson III. Whereas for 100 years, it is estimated as 2739.70 m3/s. A careful investigation for palaeoflood study was carried out in the alluvial reaches of the lower Ramganga in a ~3.5 m natural levee section (near Rampur Bajhera village, Hordoi district, UP). The study was based on identifying and marking Slack water deposits. On the basis of seven available SWD layers, palaeostage was measured on the field. By applying these palaeostage data, the palaeodischarges were extrapolated by using the slope-area method. The estimated palaeo peak discharge is ranged from 2664.72 m3/s to 4121.46 m3/s. The accuracy of the discharge estimation is dependent on the stability of the channel geometry over time. Such conditions may exist in stable bedrock confined channel reach. In the alluvial plain region, the instability of the channel is inherent, therefore, the possibility of uncertainty in the palaeodischarge may significantly arise. Although in the Western Gangetic plain region, partly confined channels are widely observed, where due to local resistance the river course remains stable over the period of time. If one can explore those places and trace out the palaeoflood deposits, the reconstruction of palaeohydraulic discharge and the time of flood occurrence would be possible. This kind of research will help to understand the nature and intensity of the past flood event accurately than the analysis of historical or gauging data. Hence, on the basis of palaeodischarge data, the future predictions can be made more efficiently.
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Mukherjee, R. (2022). Palaeohydrologic Estimates of Flood Discharge of Lower Ramganga River Catchment of Ganga Basin, India, Using Slackwater Deposits. In: Pradhan, B., Shit, P.K., Bhunia, G.S., Adhikary, P.P., Pourghasemi, H.R. (eds) Spatial Modelling of Flood Risk and Flood Hazards. GIScience and Geo-environmental Modelling. Springer, Cham. https://doi.org/10.1007/978-3-030-94544-2_3
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