GIS based quantitative morphometric analysis and its consequences: a case study from Shanur River Basin, Maharashtra India

Abstract

A morphometric analysis of Shanur basin has been carried out using geoprocessing techniques in GIS. These techniques are found relevant for the extraction of river basin and its drainage networks. The extracted drainage network was classified according to Strahler's system of classification and it reveals that the terrain exhibits dendritic to sub-dendritic drainage pattern. Hence, from the study, it is concluded that remote sensing data (SRTM-DEM data of 30 m resolution) coupled with geoprocessing techniques prove to be a competent tool used in morphometric analysis and evaluation of linear, slope, areal and relief aspects of morphometric parameters. The combined outcomes have established the topographical and even recent developmental situations in basin. It will also change the setup of the region. It therefore needs to analyze high level parameters of drainage and environment for suitable planning and management of water resource developmental plan and land resource development plan. The Shanur drainage basin is sprawled over an area of 281.33 km². The slope of the basin varies from 1 to 10 %, and the slope variation is chiefly controlled by the local geology and erosion cycles. The main stream length ratio of the basin is 14.92 indicating that the study area is elongated with moderate relief and steep slopes. The morphometric parameters of the stream have been analyzed and calculated by applying standard methods and techniques viz. Horton (Trans Am Geophys Union 13:350-361, 1945 ), Miller (A quantitative geomorphologic study of drainage basin characteristics in the clinch mountain area, Virginia and Tennessee Columbia University, Department of Geology, Technical Report, No. 3, Contract N6 ONR 271-300, 1953 ), and Strahler (Handbook of applied hydrology, McGraw Hill Book Company, New York, 1964 ). GIS based on analysis of all morphometric parameters and the erosional development of the area by the streams has been progressed well beyond maturity and lithology is an influence in the drainage development. These studies are very useful for planning of rainwater harvesting and watershed management.

Appl Water Sci (2017) 7:861871 DOI 10.1007/s13201-015-0298-7

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GIS based quantitative morphometric analysis and its consequences: a case study from Shanur River Basin, Maharashtra India

Chaitanya B. Pande1 Kanak Moharir1

Received: 23 August 2014 / Accepted: 3 June 2015 / Published online: 23 June 2015 The Author(s) 2015. This article is published with open access at Springerlink.com

Abstract A morphometric analysis of Shanur basin has been carried out using geoprocessing techniques in GIS. These techniques are found relevant for the extraction of river basin and its drainage networks. The extracted drainage network was classied according to Strahlers system of classication and it reveals that the terrain exhibits dendritic to sub-dendritic drainage pattern. Hence, from the study, it is concluded that remote sensing data (SRTMDEM data of 30 m resolution) coupled with geoprocessing techniques prove to be a competent tool used in morphometric analysis and evaluation of linear, slope, areal and relief aspects of morphometric parameters. The combined outcomes have established the topographical and even recent developmental situations in basin. It will also change the setup of the region. It therefore needs to analyze high level parameters of drainage and environment for suitable planning and management of water resource developmental plan and land resource development plan. The Shanur drainage basin is sprawled over an area of 281.33 km2. The slope of the basin varies from 1 to 10 %, and the slope variation is chiey controlled by the local geology and erosion cycles. The main stream length ratio of the basin is 14.92 indicating that the study area is elongated with moderate relief and steep slopes. The morphometric parameters of the stream have been analyzed and calculated by applying standard methods and techniques viz. Horton (Trans Am Geophys Union 13:350361, 1945), Miller (A quantitative geomorphologic study of drainage basin characteristics in the clinch mountain area, Virginia and Tennessee Columbia University, Department of Geology, Technical Report, No. 3, Contract N6 ONR 271300, 1953),

and Strahler (Handbook of applied hydrology, McGraw Hill Book Company, New York, 1964). GIS based on analysis of all morphometric parameters and the erosional development of the area by the streams has been progressed well beyond maturity and lithology is an inuence in the drainage development. These studies are very useful for planning of rain-water harvesting and watershed management.

Keywords Morphometric analysis Digital elevation

model Slope map Geographical information system

Geoprocessing

Introduction

Morphometry is dened as the measurement and mathematical analysis of the conguration of the Earths surface, and the shape and dimensions of its landforms. The development of a drainage system over space and time is inuenced by several variables such as geology, structural components, geomorphology, soil and vegetation of an area through which it ows. Morphometric analysis of river basin provides a quantitative description of the drainage system, which is an important aspect of the characterization of basins (Strahler 1964). It is important in any hydrological investigation like assessment of groundwater potential, groundwater management, basin management and environmental assessment.

Various hydrological phenomena is correlated with the physiographic characteristics of a drainage basin such as size, shape, slope of the drainage area, drainage density, size and length of the contributories, etc. (Rastogi and Sharma 1976; Magesh et al. 2012). The dynamic nature of runoff is controlled by the geomorphologic structure of the catchment area and the induced runoff is very sensitive towards the

& Chaitanya B. Pande [email protected]

1 Department of Geoinformatics, Shir Shivaji College, Akola444001, Maharashtra, India

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morphometric characteristics of the contributing area (Rudraiah et al. 2008). The morphometric analysis is performed through measurement of linear, aerial, relief, gradient of channel network and contributing ground slope of the basin (Nautiyal 1994; Nag and Chakraborty 2003; Magesh et al. 2012). In India, National Institute of Hydrology (1993) hydro-geomorphological studies of various basins has been carried out and their analyses are based on linear, aerial and relief aspects using different mathematical equations. Various morphometric parameters such as drainage pattern, stream order, bifurcation ratio, drainage density and other linear aspects are studied using remote sensing technique and topographical map (Mesa 2006; Zwnnitz 1932). The surface runoff and ow intensity of the drainage system is estimated using the geomorphic features associated with morphometric parameters (Ozdemir and Bird 2009). Pioneer work on basin morphometry has been carried out by Horton (1932, 1945), Miller (1953), Smith (1950), and Strahler (1964). Application of remote sensing provides a reliable source for the preparation of various thematic layers for morphometric analysis. The digital elevation data is used for generating the elevation model of a landscape to any extent. The resolution of the image may vary with respect to the satellite sensors. The

processed DEM is used for generating the stream network and other supporting layers (Magesh et al. 2011; Moharir and Pande 2014). Geographical information systems (GIS) have been used for assessing various basin parameters, providing exible environment and powerful tool for determination, interpretation and analysis of spatial information related to river basins. Geology, relief and climate are the primary determinants of a running water ecosystem functioning at the basin scale (John Wilson et al. 2012). Thus, detailed study of morphometric analysis of a basin is great help in understanding the inuence of drainage morphometry on land-forms and their characteristics. The present study area describes the process to calculate the various morphometric parameters of Shanur River Basin in Akola and Amravati districts using remote sensing and GIS techniques.

Study area

The Shanur River Basin is situated in Akola and Amravati Districts of Maharashtra, India. It lies between 20 4003600N latitude and 76 4601100E longitude covered by survey of

India toposheets no. 55 H/5 and 55 H/9 on 1:50,000 Scale

Fig. 1 Location map of study area

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in (Fig. 1). The study area is covers 281.33 km2. It has

continental type climate classied as sub-tropical and sub-humid with average annual rainfall of 1200 mm.

The study area is delineated river basin boundary and stream network of basin from SRTM data. The extracted basin and stream network are projected to the regional projection (WGS 1984 UTM Zone 43N).

Methodology

The present work is based on morphometric analysis of Shanur River Basin for development of water and soil conservation measures. The morphometric conditions has were study with the help of DEM data (30 m resolution) and SOI topographical maps (1:50,000). The drainage map (Fig. 2) of the study area is prepared using Geocoded FCC of bands 2, 3 and 4 of IRS- LISS-III satellite images in March, 2014 and SOI toposheets on 1:50,000 scale with sufcient ground truth. The Shanur River Basin is

delineated with the help of Arc GIS 10 software. Direct measurements of geometric characteristics (e.g., area and perimeter of the basin, length and number of streams) are automatically obtained from GIS software. The various morphometric parameters such as area, perimeter, stream order, stream length, stream number, bifurcation ratio, drainage density, stream frequency, drainage texture, length of basin, form factor, circulatory ratio and elongation ratio, etc., is computed based on the formula suggested by (Horton 1945; Miller 1953; Schumm 1956; Strahler 1964) given in Tables 1, 2 and 3. Each morphometric characteristic is considered as a single parameter and knowledge based weightage has been assigned by considering its role in soil erosion. Each parameter has been given a rank as per morphometric result. For linear aspect, high weightage has been given for high values, and aerial aspect is assigned low weightage for high values. The drainage basin characteristics help in interpreting and understanding the interrelated relief and slope properties. The compound parameter values are calculated and the basin with lowest compound weight has been given highest priority. The nal priority classication has been specied into three major classes, i.e., high priority, moderate priority and poor priority. The high priority indicates need of reclamation

Table 1 Stream order, streams number, and bifurcation ratios of Shanur River Basin

Su Nu Rb Nu-r Rb 9 Nu-r Rbwm

I 144 4.39

II 33 4.36 177 771.72

III 7 4.71 40 188.4

IV 2 3.5 9 31.5

Total 186 12.57 226 991.62

Mean 3.14a

Su stream order, Nu number of streams, Rb bifurcation ratios, Nu-r number of stream used in the ratio, Rbwm weighted mean bifurcation ratio

a Rbm Mean bifurcation ratioTable 2 Stream length and stream length ratio in Shanur River Basin

Su Lu Lu/Su Lur Lur-r Lur 9 Lur-r Luwm

I 151.71 1.03 1.94

II 71.93 2.18 0.17 223.64 38.02

III 47.38 6.77 3.1 119.31 369.86 IV 58.81 29.4 4.34 106.91 463.99

Total 329.83 39.38 7.61 449.86 871.87

Mean 1.90a

Su stream order, Lu stream length, Lur stream length ratio, Lur-r stream length used in the ratio, Luwm weighted mean stream length ratio

a Lurm Mean stream length ratio

Fig. 2 Stream order map of study area

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Table 3 Result of morphometric analysis of Shanur River Basin

1 Stream order (Su) Hierarchical rank Strahler (1952) 142 1st order stream (Suf) Suf = N1 Strahler (1952) 1443 Stream number (Nu) Nu = N1 ? N2 ? Nn Horton (1945) 1864 Stream length (Lu) Kms Lu = L1 ? L2Ln Strahler (1964) 329.835 Stream length ratio (Lur) Strahler (1964) 0.174.346 Mean stream length ratio (Lurm) Horton (1945) 1.907 Weighted mean stream length ratio (Luwm) Horton (1945) 1.948 Bifurcation ratio (Rb) Strahler (1964) 3.5-4.719 Mean bifurcation ratio (Rbm) Strahler (1964) 3.1410 Weighted mean bifurcation ratio (Rb) Strahler (1953) 1.9411 Main channel length (C1) km. GIS software analysis 14.9212 Valley length (VI) Kms GIS software analysis 43.8813 Minimum aerial distance (Adm) Kms GIS software analysis 38.4214 Channel index (Ci) Ci = Cl/Adm (H and TS) Miller (1968) 0.3815 Valley index (Vi) Vi = Vl/Adm (TS) Miller (1968) 1.1416 Rho coefcient (q) q = Lur/Rb Horton (1945) 0.3117 Basin area (A) Sq Kms GIS software analysis Schumm(1956) 281.3318 Basin length (Lb) Kms GIS software analysis Schumm(1956) 43.8819 Drainage density (Dd) Dd = Lu-A Horton (1945) 1.17

process and action plan for soil and water conservations and ood management.

Morphometric analysis

The present study integrated the use of remote sensing and GIS techniques in morphometric analysis, and the results of morphometric parameters determined are briey described and discussed. The study of basin morphometry attempts to relate basin and stream network geometries to the transmission of water and sediment through the basin. The size of a drainage basin acts upon the amount of water yield, the length, shape and relief, affect the rate at which water is discharged from the basin. The morphometric analysis is carried out with respect to the parameters like stream order, stream length, bifurcation ratio, stream length ratio, basin length, drainage density, stream frequency, elongation ratio, circularity ratio, form factor, and relief ratio using mathematical formulae given in Tables 1, 2 and the results given in Table 3.

Results and discussion

The morphometric parameters of Shanur River Basin have been examined and the results are given below. The total study area is 281.33 km2. The drainage pattern is dendritic

in nature and it is inclined by the general topography of the area.

Drainage network

Stream order (Su)

The concept of stream order was introduced by Horton in 1932. Stream ordering is a widely applied method for stream classication in a river basin. Stream ordering is dened as a measure of the position of a stream in the hierarchy of tributaries (Leopold et al. 1964) and the streams of Shanur River Basin have been demarcated according to the Strahlers system of stream ordering. The stream order and the total number of stream segments in each order for the basin are shown in Table 1. Based on the Strahler (1964) system of stream ordering, the basin has been designated as a fourth-order basin in Fig. 2. In the present investigation, maximum frequency is observed in the rst-order streams (Table 1). More number of rst-order streams is observed in the hilly region of the study area, which point towards terrain density and compacted nature of the bedrock lithology. Moreover, the presence of large number of streams in the basin indicates that the topography is still undergoing erosion, and at the same time, less number of streams indicates mature topography. The calculated result matched with Strahler (1964), which described that the total number of streams gradually decreases as the stream order increases.

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Bifurcation ratio (Rb)

The term bifurcation ratio (Rb) was introduced by Horton in (1932). Rb is related to the branching pattern of a drainage network and is dened as the ratio of the number of streams of any given order to the number of streams in the next higher order in a drainage basin (Schumm 1956). It is a dimensionless property and shows the degree of integration prevailing between streams of various orders in a drainage basin. Rb shows a small range of variation for different regions or for different environments except those where the powerful geological control dominates. The Rb for the Shanur River Basin varies from 3.5 to 4.71 (Table 1) with a mean Rb of 3.14. The mean bifurcation ratio (Rbm) characteristically ranges between 3.0 and 5.0 for a basin when the inuence of geological structures on the drainage network is negligible (Verstappen 1983). The analysis showed that the Rb is not same for all orders.

Geological and lithological development of the drainage basin may be the reason for these variations (Strahler 1964). Low Rb value indicates poor structural disturbance and the drainage patterns have not been distorted (Strahler 1964), whereas the high Rb value indicates value of Rb is also indicative of the shape of the basin. An elongated basin is likely to have high Rb, whereas a circular basin is likely to have a low Rb. In the present study area, total bifurcation ratio is 12.57 and mean is 3.14.

Weighted mean bifurcation ratio (Rbwm)

To arrive at a more representative bifurcation number,

Strahler (1953) used a weighted mean bifurcation ratio obtained by multiplying the bifurcation ratio for each successive pair of orders by the total numbers of streams involved in the ratio and taking the mean of the sum of these values. Schumm (1956) has used this method to determine the weighted mean bifurcation ratio of the value of 4.39 of the drainage (Table 1).

Stream number (Nu)

With the help of GIS, the ve streams of different orders and the total numbers of streams in the basin are counted independently (Table 1). Generally, the number of streams gradually decreases as the stream order increases, the variation in order and size of tributary basins largely depends on physiographic and structural condition of the region. The 186 stream segments are recognized in Shanur River Basin (Table 1). That is very large runoff drainage pattern identify in the study area. All of this morphometric parameters use in developed watershed management and also identify runoff zone, ground water recharge zone and storage. High values of rst-order streams indicate that

there is a possibility of unexpected ash ood after heavy rainfall in the down streams (Chitra et al. 2011).

Stream length (Lu)

Generally, the total length of stream segments is the maximum in rst-order streams and decreases with an increase in the stream order. Streams with relatively short lengths are representative of areas with steep slopes and ner texture, whereas longer lengths of stream are generally indicative of low gradients (Strahler 1964). Stream length is calculated from mouth of a river to drainage with help of Arc GIS-10 software. This has been computed based on the law proposed by Hortons law for all the river basin of the study area. The total stream length of the Shanur River Basin is 329.83. Usually, the total length of stream segments in rst-order streams is maximum and it increases as the stream order increases. The study computed the stream length based on the low proposed by Horton (1945) in Table 2.

Mean stream length (Lum)

Mean stream length is characteristic property related to the drainage network components of a drainage network and its contributing Mahesh basin area surfaces (Strahler 1964). It is obtained by dividing the total length of stream of an order by total number of segments. The Lsm values differ with respect to different basins, basins, as they are directly proportional to the size and topography of the basin. Strahler (1964) indicated that the Lsm is a characteristic property related to the size of drainage network and its associated surfaces.

Stream length ratio (Lurm)

Stream length ratio is the ratio of the mean length of one order to the next lower order of the stream segments. The stream length ratio between the streams of different orders of the study area shows changes in basin. This change might be attributed to variation in slope and topography, indicating the late, youth stage of geomorphic development in the streams of the study area. Horton (1945) states that the length ratio is the ratio of the mean (Lur) of segments of order (So) to mean length of segments of the next lower order (Lu-1), which tends to be constant throughout the successive orders of a basin. His law of stream lengths states that the mean stream lengths of stream segments of each of the successive orders of a watershed tend to approximate a direct geometric sequence in which the rst term (stream length) is the average length of segments of the rst order. Changes of stream length ratio from one order to another order indicate their late youth stage of geomorphic development.

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Fig. 3 Drainage density map of study area

Basin length (Lb)

The basin length (Lb) is the longest length of the basin from the head waters to the point of conuence (Gregory and

Walling 1973). The Shanur River Basin originates from the Western Ghats at an altitude of about 785 m above mean sea level and drains into the Arabian Sea. The basin length determines the shape of the basin. High basin length indicates elongated basin. The Lb of the basin is 43.88 km (Table 3).

Channel index (Ci) and valley index (Vi)

The river channel is divided into number of segments for determination of sinuosity parameter. The measurement of channel length, valley length, and shortest distance between the source, and mouth of the river (Adm), i.e., air

lengths are used for calculation of Channel index and valley index in (Table 3).

Basin area (A)

The area of the river basin is another important parameter like the length of the stream drainage. Schumm (1956) established an interesting relation between the total basin areas and the total stream lengths, which are supported by the contributing areas. The basin area is computed 281.33 km2 with the help of Arc GIS-10 software in Table 3.

Rho coefcient (q)

The Rho coefcient is an important parameter relating drainage density to physiographic development of a

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Fig. 4 Slope map of study area

watershed which facilitate evaluation of storage capacity of drainage network and hence, a determinant of ultimate degree of drainage development in a given watershed Horton (1945). The climatic, geologic, biologic, geomorphologic, and anthropogenic factors determine the changes in this parameter. Rho value of the Shanur River basin is0.31 as shown in Table 3. This suggests higher hydrologic storage during decrease of effects of erosion during elevated discharge.

Drainage density (Dd)

Drainage density (Dd) is one of the important indicators of the landform element and provides a numerical measurement of landscape dissection and runoff potential (Chorley

1969). Dd is dened as the total stream length in a given basin to the total area of the basin (Strahler 1964) (Fig. 3).

Slope

The slope of a terrain to the amount of inclination of physical feature, landform is the horizontal surface. Slope analysis is an important parameter in morphometric studies. The slope elements, in turn are controlled by climate-morphogenic processes in areas having rock of varying resistance. According to Burrough (1986), it is the maximum rate of change in value from each cell to its neighbors is identied as slope grid. The present of slope exhibited by Shanur River Basin varies from 1 to 10 %. The slope map of the Shanur Basin is shown in Fig. 4. The higher slope

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Fig. 5 Flow direction map of study area

gradient in the study area is contributed by the hilly Western Ghats. Higher slope gradient results in rapid runoff with potential soil loss or erosion in Fig. 4.

Flow direction

Flow direction map of Shanur River Basin is prepared by using the DEM dataset. Water ows in the direction of the steepest downhill gradient. In DEM dataset, every pixel is potentially surrounded by eight neighboring pixels. The slope in each of these eight neighboring locations and the value at the pixels are being examined. The present study area ow direction value is 1249 calculated by DEM data.

This difference in elevation is then divided by the center to center distance between directions of water ow. The ow direction at every point throughout delineating watersheds was determined. The analysis reveals that the ow direction is mostly towards eastern side as seen in Fig. 5 (Figs. 6, 7).

Final prioritization

The Stream order wise prioritization of river basin total values are calculated individual and then cumulative values often by using total values of morphometric parameter. After that, weighted value is assigned to each of the stream

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Fig. 6 Aspect map of study area

Fig. 7 Topographic model of study area

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Table 4 Morphometric parameters using prioritization of the stream

Stream number Bifurcation ratio (Rb) Stream length Lu/Su Rank

1 10 8 1 I

2 6 4 7 II

3 5 5 6 III

4 9 3 7 IV

according to the deferent morphometric aspects. Then total weighted values of each streams order wise have been calculated and then stream rst priority and nal prioritization class is made Table 4 class was made (Fig. 8).

Conclusion

The present study area proved that the GIS and RS technique used for computation and analysis of various morphometric parameters of the basin and helps to understand various terrain parameters such as nature of the bedrock,

inltration capacity, surface runoff, etc. The Shanur River is well drained in nature with the stream order varying from 1 to 4. The basin is dominated by lower order streams and the total length of stream segments. Stream frequency and drainage density is the prime criterion for the morphometric classication of drainage basins, which certainly control the runoff pattern, sediment yield, and other hydrological parameters of the drainage basin. The detailed study shows 19 morphometric parameters that have been calculated with the help of Arc GIS-10 software. The bifurcation ratio ranges is 3.54.71 and the total bifurcation ratio is 12.57. The quantitative analysis of linear, relief and aerial parameters using GIS and RS techniques is found to be of immense utility in river basin evaluation, basin prioritization for soil and water conservation and natural resource management. The bifurcation ratio in the basin indicates normal basin category and the presence of moderate drainage density suggesting that, it is moderate permeable subsoil and coarse drainage texture. The morphometric analysis of the drainage network of the basin

Fig. 8 Prioritization classes map of study area

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show dendritic to sub-dendritic drainage patterns with moderate drainage texture. The variation in stream length ratio might be due to change in slope and topography. The morphometric analysis is carried out in 4 stream order of Shanur River Basin using GIS and RS techniques for determining the linear aspects such as stream order, bifurcation ratio, stream length and Lu/Su. The difference in stream length ratio might be due to changes in slope and topography. The basin is having moderate to high relief of the terrain and elongated in shape. The higher drainage density indicates that the sub-basin is impermeable subsoil and sparse vegetation cover. The Channel index (Ci),

Valley index (Vi), Rho coefcient (q) and minimum aerial distance (Adm) Kms values are 0.38, 1.14, 0.31, and 38.42, respectively, indicating that the Shanur River Basin is elongated in shape, with high discharge of runoff and impermeable subsoil condition. Remote sensing and GIS techniques have best efcient tool in drainage delineation. The conventional methods of morphometric analysis are time-consuming and error prone, while use of GIS method allows for more reliable and accurate estimation of similar parameters of Shanur River Basin. The rst and second stream order is a high priority stream and is prone to comparatively higher erosion and soil loss. Geological eld verication also agrees with the present morphological-based prioritization. Hence, appropriate soil erosion control measures are required in this basin to conserve the land from further erosion.

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