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INTERANTIONAL JOURNAL OF SCIENTIFIC RESEARCH IN ENGINEERING AND MANAGEMENT, 2022

Landslides are one of the most damaging disastrous phenomena that frequently lead to serious prob... more Landslides are one of the most damaging disastrous phenomena that frequently lead to serious problems in hilly areas. Various impacts of landslides have increased in past decades due to the rapid growth of urbanization in the developing world. Kodagu district, a part of Western Ghat Region is a sensitive topography with a series of ridges and susceptible to frequent landslide occurrences and experienced ever known earthslides and mudslides along with floods affecting 19 casualties in the year 2018, majority of the landslide are occurred in the Madikeri taluk. High intensity and continuous monsoon seasonal rainfall is the common triggering factor. Remote sensing data and multiple weighted overlay analysis using GIS is carried out for the different thematic layers of lithology, geomorphology, lulc, slope, aspect, drainage density, soil, and rainfall are assigned ranking and weightages to delineate landslide susceptible zones. Cumulative rainfall of each 500mm interval is assigned high...

The quantitative analysis of drainage system is an important aspect of characterization of waters... more The quantitative analysis of drainage system is an important aspect of characterization of watersheds. Using watershed as a basin unit in morphometric analysis is the most logical choice because all hydrological and geomorphic processes occur within the watershed. The Budigere Amanikere watershed a tributary of Dakshina Pinakini River has been selected for case illustration. Geoinformatics module consisting of ArcGIS 10.3v and Cartosat-1 Digital Elevation Model (DEM) version 1 of resolution 1 arc Sec (*32 m) data obtained from Bhuvan is effectively used. Sheet and gully erosion are identified in parts of the study area. Slope in the watershed indicating moderate to least runoff and negligible soil loss condition. Third and fourth-order sub-watershed analysis is carried out. Mean bifurcation ratio (R b) 3.6 specify there is no dominant influence of geology and structures, low drainage density (D d) 1.12 and low stream frequency (F s) 1.17 implies highly infiltration subsoil material and low runoff, infiltration number (I f)1.3 implies higher infiltration capacity, coarse drainage texture (T) 3.40 shows high permeable subsoil, length of overland flow (L g) 0.45 indicates under very less structural disturbances, less runoff conditions, constant of channel maintenance (C) 0.9 indicates higher permeability of subsoil, elongation ratio (R e) 0.58, circularity ratio (R c) 0.75 and form factor (R f) 0.26 signifies sub-circular to more elongated basin with high infiltration with low runoff. It was observed from the hypsometric curves and hypsometric integral values of the watershed along with their sub basins that the drainage system is attaining a mature stage of geomorphic development. Additionally, Hypsometric curve and hypsometric integral value proves that the infiltration capacity is high as well as runoff is low in the watershed. Thus, these mor-mometric analyses can be used as an estimator of erosion status of watersheds leading to prioritization for taking up soil and water conservation measures. Keywords Morphometry Á Cartosat-1DEM Á Budigere Amanikere watershed Á Dakshina Pinakini Á Hypsometric curve and hypsometric integral and RS and GIS

Ramesh Rainfall studies are of utmost utility for understanding nature & hence the behaviour of c... more Ramesh Rainfall studies are of utmost utility for understanding nature & hence the behaviour of climate changes. Time series is a set of observations taken at specified times usually at equal interval. The inherent variability displayed by many hydrological time series usually mask trends and periodic patterns. This situation has often led to " something " the original time series so that the effects of random variations are reduced and trends or cyclical patterns enhanced. Thus a set of data depending on time is called a Time series. Here, Rainfall series represent the time series. The time series analysis is helpful to compare the actual performance and analyse the cause of variations. By comparing different time series we can draw important conclusion. Graphical method implies in increasing trend for pre-monsoon, southwest monsoon, northeast monsoon and annually.Geo-informatics module consists of GIS mapping for Location map, Geomorphology map and Season wise Rainfall maps are generated. Autocorrelation indicates the periodicity observed as 37,16 & 6 years (PM), 12, 37 & 16 years (SWM), 8, 18 & 6 years (NEM) and 16, 22 & 8 years (Annual) respectively. Power spectral depicts the cyclicity of 37, 4 & 3 years (PM), 2, 4& 2 years (SWM), 3, 7 & 2 years (NEM) and 2, 4 & 2 years (Annual) respectively. Moving average displays prominent positive correlation coefficients at lags of 18 to 42 years in PM & SWM and 12 to 24 years in NEM & Annual. The southwest and southeast parts of the study area experience the heavy rainfall whereas the least rainfall areas are the northern parts of the study area.The short term and long term cyclicity observed in Autocorrelation, power spectrum and Moving Average. Spatial variation of rainfall for the three seasons and annual has been studied Copy Right, IJAR, 2014,. All rights reserved

From three different sources viz. survey of India topographic map (1:50,000), CartoDEM (10 mts) a... more From three different sources viz. survey of India topographic map (1:50,000), CartoDEM (10 mts) and Aster GDEM (30 mts) morphometric parameters are derived and evaluated. Manually digitized the drainage network from toposheets and extracted drainage network system from CartoDEM and Aster GDEM using ArcGIS 10.2 software. Basic, derived and shape parameters are considered for basin analysis. The mean bifurcation ratio of the given basin for CartoDEM & Aster GDEM are having nearby values and also indicates some sort of geological control, high stream frequency (Fs) is indicative of high relief and low infiltration capacity of the bedrock pointing towards the increase in stream population with respect to increase in drainage density, low drainage density (Dd) leads to coarse drainage texture, value of Lg for topographic, CartoDEM and Aster GDEM data indicating very fine texture & fine texture respectively. From the shape parameters the Kumudvathi watershed indicates it is sub-circular and elongated. The results from the high resolution data will have the nearby values and less of % variation, whereas in low resolution data % of variation is more and will not meet criteria.

Groundwater is an essential resource contributing overall annum supply considerably. Conversely, ... more Groundwater is an essential resource contributing overall annum supply considerably. Conversely, over-exploitation in rapid growing cities like Bangalore has depleted groundwater availability without proper management. Assessment the potential zones by the weighted overlay techniques with the help of remotely sensed existing different land parameters from Landsat ETM+ Images (Bands 1 to 7)like Geology, Geomorphology, Slope, land use and/or land cover and Lineaments processed in GIS techniques for groundwater recharge is very much necessary towards maintaining the water quality and it points to organizing proper groundwater management. The study area has been classified into five categories from very poor at urbanized areas and excellent in the parts of pediplain agricultural. Excellent potential zone surrounds an area of 1107 km2, good potential zone holds for an area of 2253 km2, moderate potential zone of 78 km2, poor potential zone of 215 km2 at villages and very poor potential zone of 230 km2 at urbanized areas. The study area holds majority of good potential zones and helps to increase the groundwater levels by artificial structures.

INTERANTIONAL JOURNAL OF SCIENTIFIC RESEARCH IN ENGINEERING AND MANAGEMENT, 2022