Morphometric analyses of Neyyar River Basin, southern Kerala, India

Abstract

The natural behaviour of the earth's surface is proceeding through morphometric analyses and its environmental aspects. Different aspects of morphometric analyses depends upon geological transformation of earth surface. The structure of landscape determines the river flow from upper to lower elevation. The morphometric studies of river integrates the new geo morphological features with the climatic factors such as rainfall, temperature, atmospheric pressure and wind. The drainage map is prepared using the toposheets, delineating the streams and watershed boundary. The strahler method classifies the stream orders for this sophisticated morphometric analyses. The quantitative morphometric analysis carried out in Neyyar sub-watershed includes Network analysis; Basin geometry; Texture analysis and Relief characteristics. The relief characteristics were used to generate the hypsometric curve which exhibit the monadnock and reliefs of coastal morphology. Drainage, Drainage Density, Geomorphology, Landuse/Landcover, and Slope were prepared using Geographic Information Systems (GIS). The present study concludes the influence of the parameters and thematic data in understanding the geomorphological problems and stating a sustainable development of water resources in Neyyar sub-watershed.

Variation in species assemblages due to micro-topography and flow regime govern vegetation carbon stock in seasonal floodplain wetlands

“…We attribute these to the variations in the wetland microtopographic characteristics such as depth, width, and crosssectional area in the sampling stations across the wetland. Several other studies have also inferred that the topographic characteristics of aquatic ecosystems are among the significant determinants of flow variation (Wetzel 2001;Camila de Sousa et al 2011;Yunus et al 2003;Singh et al 2014;Pandi et al 2017;Soni 2017;Prabhakaran and Raj 2018), which in turn create heterogeneous micro-environments within wetlands.…”

Determination of Parameters for Watershed delineation using various satellite derived Digital Elevation Models and its accuracy

“…In the recent past, many watershed drainage network extraction studies have been prepared using various DEMs. (Samal et al, 2015), (Kaliraj et al, 2015), (Al-Saady et al, 2016), (Dinagara Pandi et al, 2017) in their exploration, the ASTER DEM and topographic sheets were used for morphometric analysis. From their inference, the ASTER DEM is a sufficient source for watershed drainage morphological study (Sreedevi et al, 2009), (Ansari et al, 2012), (Patel et al, 2013), (Prabu & Baskaran, 2013), (P. Singh et al, 2014), and (Samal et al, 2015) used DEMs derived from SRTM 90m resolution DEM and along with topo sheets for extraction drainage network.…”

A catchment scale assessment of water balance components: a case study of Chittar catchment in South India

“…The catchment boundary and slope maps are delineated from Aster-GDEM. The slope affects both runoff and in ltration, and so affecting WBCs(Dinagara et al 2017b). The study area considered for this paper; the percentage of slope varies from 0 to 18 %.…”