Morphometric Analysis of Shalmala River Sub-Basin Dharwad District
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Vol 11, Issue 4 , April/ 2020 ISSN NO: 0377-9254 MORPHOMETRIC ANALYSIS OF SHALMALA RIVER SUB- BASIN DHARWAD DISTRICT, KARNATAKA, USING RS AND GIS TECHNIQUES Chandrashekhar Kalyani1, Swanand A. Ajgaonkar2 and Manjunatha S3* 1Research Scholar, 2Research Scholar, 3Associate Professor 1,2,3 Department of Geology, Karnatak University’s of Karnatak Science College, Dharwad, India Abstract— In the present study an attempt has characteristics of the Shalmala river sub-basin, been made to evaluate the morphometric Karnataka, which is located between latitudes 15⁰ analysis of the Shalmala river sub-basin by 06' 21.6" to 15⁰ 24' 50.4" and longitudes 75⁰ 00' using Remote Sensing (RS) and Geographic 3.6" to 75⁰ 11' 49.2" and fall in parts of Survey of Information System (GIS) techniques. The study India toposheet numbers 48M/3 and 48M/4 area is delineated by Arc GIS v10.4 software as (1:50,000 scale). The sub-basin covers an area of per ASTER-DEM. Morphometric parameters 363.39Km² (Figure 1). The elevation ranges from like linear, areal and relief aspects of the basin 498m to 772m above mean sea level (MSL) and have been evaluated. The study revealed that, receives 772mm of an average annual rainfall and the drainage pattern of the study area is sub- annual average temperature is around 24.3⁰C. dendritic to dendritic. The highest stream order Geologically, the Shalmala river sub-basin is is fifth order. The drainage density (Dd) of the covered by Sedimentary rocks such as greywacke, area is 1.583 Km⁻¹ indicates the area comprises argillites and banded ferruginous quartzite. The of highly permeable subsurface material. The present study constitutes metamorphic formation mean bifurcation ratio of the present area is like Quartz mica-schist of Chitradurga group of 4.69, suggests that the area is not affected by Archean age. At some places, dolerite dyke cuts structural disturbances. The relief ratio of the across the bedding planes. study area is 0.00786 which indicates gentle slope and comparatively higher infiltration. The Shalmala river sub-basin comprises sufficient number of lineaments for the groundwater recharge. Keywords— Dharwad, Digital Elevation Model, GIS, Karnataka, Morphometric analysis, Remote sensing, Shalmala River 1. INTRODUCTION Morphometry is the operation of measurement and mathematical analysis of the configuration of the earth’s surface, shape and dimensions of the landforms [1], [2], [3], [4] and [5]. The study helps to understand channel network, ground slope, structural control, geologic and geomorphic of a drainage basin [6]. Remote sensing and geographical information system (RS-GIS) techniques are in trend for assessing various morphometric and hypsometric parameters of the drainage basin/watershed [7], [8], [9], [10], [11], Fig. 1 Location map of the Shalmala river sub- [12] and [13]. Recently, researchers carried out basin morphometric analysis using RS and GIS techniques [14], [15], [16], [17], [18], [19], [20], 2. METHODOLOGY The morphometry analysis of Shalmala river [21], [22], [23], [24], [25], [26]. Hence, the present sub-basin has been carried out by using Arc-GIS study is carried out on morphometric www. jespublication.com Page No:882 Vol No, Issue No, Month / Year ISSN NO: 0377-9254 software v10.4. Georeferencing, digitization and Rl = Lu/Lu-1 delineating the entire study area has been done with Where, NRSC standards. The drainage system is extracted Rl=Stream length by using Advanced Spaceborne Thermal Emission ratio Steam Length and Reflection Radiometer-Digital Elevation 04 Lu=Total steam Ratio (Rl) Model (ASTER-DEM) data (30m resolution) length of order ‘u’ (Figure 2). Lu-1=Total steam The morphometric parameters like linear length of its lower aspects, areal aspects and relief aspects were order calculated using the formulas (Table 1) given by Rb = Nu/Nu+1 the Strahler, Horton and Schumm [6], [27] and Where, [28]. Rb=Bifurcation ratio Nu=Total number Bifurcation 05 of stream segments Ratio (Rb) of order ‘u’ Nu+1=Total number of segments of the next higher order Dd=Lu/A Where, Dd=Drainage Drainage density 06 Density (Dd) Lu=Total length of streams A=Area of the basin Rt = Nu/P Fig. 2 Digital Elevation Model (DEM) of the study Where, area Rt=Drainage texture Drainage Table I. Formulae adopted for computation of 07 Nu=Total no. of texture (Rt) morphometric parameters. streams of all orders Sl. Morphometric P=Perimeter of the Formulae No. parameters basin Steam Order Hierarchical Re= 01 (U) rank (2√(A⁄π))/Lb Steam Length Length of the Where, 02 Re=Elongation (Lu) steam Elongation 08 ratio Lsm = Lu/Nu Ratio (Re) Where, A=Area of Lsm=Mean stream watershed length Lb=Basin Length Mean Steam 03 Lu=Total steam π =3.14 Length (Lsm) length of order ‘u’ Nu=Total number Where, Circulatory Rc=Circulatory of stream segments 09 of order ‘u’ Ratio (Rc) ratio A=Area of sub- basin www. jespublication.com Page No:883 Vol No, Issue No, Month / Year ISSN NO: 0377-9254 P=Perimeter of number sub-basin Dd=Drainage π=3.14 density Bh=Basin relief Fs=Nu/A Where, Fs=Stream Stream frequency 10 Frequency (Fs) Nu=Total number 3. RESULTS AND DISCUSSIONS of all streams 3.1. LINEAR ASPECTS A=Area of sub- basin A linear aspect of morphometric studies includes Ff=A/Lb² following parameters (Table 2). Where, Stream order is a hierarchy of tributaries as Form Factor Ff=Form factor proposed by Strahler [6]. The current area is the 11 (Ff) A=Area of a sub- fifth order drainage basin (Figure 3). basin The number of stream segments in each order is Lb=Basin Length known as stream number (Nu). Horton [27] stated, Lo=1/Dd*2 the number of stream segments forms an inverse Where, geometric relationship against the order. It is Length of Lo=Length of calculated that, the total stream numbers of 12 Overland Flow overland flow different orders from the study area is 586. The (Lo) Dd=Drainage stream numbers of the first stream order in the density present study area is 457, for second stream order Cm=1/Dd is 100, for third stream order is 22, for fourth order Where, is 6 and for fifth order is 1 respectively (Table 2). Constant Cm=Constant Hence, the large number of streams in the basin Channel 13 channel indicates that the topography is still rugged and Maintenance maintenance streams are rapidly cutting their channels. (Cm) Dd=Drainage The stream length has been carried out as per the density law proposed by Horton [27]. The maximum steam length (Lu) of the study area is 287.575 Km and Bh = H – h average stream length is 115.065 Km. The stream Where, length of various orders is presented in the Table 2. Bh=Basin relief Basin relief The mean stream length (Lsm) is a 14 Vertical distance (Bh) characteristic property associated with basin between the surface [6], [27]. It can be determined by dividing highest & lowest the total stream length of all orders by the total points number of stream segments. The mean stream Rh = Bh/Lb length of the study area is varying from 0.629 Km Where, Relief ratio to 20.768 Km with an average 06.714 Km (Table 15 Rh=Relief ratio (Rh) 2). Topography and slope cause the variation of its Bh=Basin relief value. Lb=Basin length The stream length ratio (Rl) of the study area Rr = Bh/P ranges between 0.483 to 0.610 (Table 2). Change in Where, stream length indicates late youth stage of Relative relief Rr=Relative relief 16 geomorphic development [29], [30], [31]. (Rr) Bh=Basin relief Bifurcation ratio (Rb) is a dimensionless P=Perimeter of property and shows the degree of integration basin prevailing between streams of various orders in a Rn = Dd*Bh Ruggedness drainage basin. Bifurcation ratio of the Shalmala 17 Where, number (Rn) river sub-basin varies from 3.666 to 6 with a mean Rn=Ruggedness www. jespublication.com Page No:884 Vol No, Issue No, Month / Year ISSN NO: 0377-9254 of 4.69 (Table 2), which indicates that the area is permeable sub-soil material under the dense not much affected by structural disturbances. vegetative cover and low relief. Drainage density of the present study area is 1.583 Km⁻¹ (Table 3), suggesting low drainage density (Figure 4). Fig. 3 Stream orders of the Shalmala river sub- basin. Fig. 4 Drainage density of the Shalmala river sub- Table II. Results of linear aspects of Shalmala river basin. sub-basin. Mea Drainage texture is the ratio of total number of n Strea stream segments to the perimeter area. It depends Strea Strea Strea strea m upon the meteorological, geological and climate m m Bifurcati m m lengt aspects [32], [33]. According to Smith [32] Numb Lengt on ratio Orde lengt h classification, the drainage texture of the study area er h (Lu) (Rb) r (U) h ratio is 4.327 Km⁻¹ (Table 3), indicates moderate (Nu) Km (Lsm (Rl) drainage texture. ) Km Horton [8] stated that the basin elongation ratio is 287.5 0.62 1 457 - - varies between 0.6 to 1.0 associated with a wide 75 9 variety of climate and geology. A circular basin is 140.0 1.40 0.48 2 100 4.57 more effective in discharge than elongated basin 84 0 7 [31]. In the study area the elongation ratio is 0.61 085.5 0.61 3 22 3.88 4.545 (Table 3), represents elongated shape. 24 0 041.3 6.89 0.48 4 06 3.666 Circulatory ratio is influenced by the length of 74 5 3 the streams, frequency of streams and slope of the 020.7 20.7 0.50 5 01 6 basin.