Abstract
The current study has been derived to understand morphometric parameters to pledge the reduction in the proclaimed drought influence for climate change. Watershed prioritization has been studied using the geographical information system and remote sensing techniques for soil erosion and water preservation measure at Plio–Pleistocene elevated tract in Bangladesh. Secondary data, i.e., SRTM DEM and the topographical sheets, have been used for the drainage network identification. Seventeen watersheds of fifth order and three watersheds of sixth order are selected for the whole study. Sixteen basic morphometric parameters that are categorized as areal, linear and relief aspects have been used for the study area. The study area comprises sixth stream order that has been obtained using a stream threshold value of 100-m length. Morphometric analysis is suitable for water and soil conservation practice where groundwater and relevant data sets are not available. For the categorization and correlation of the morphometric parameters, principal component analysis (PCA) has been used in the present study. PCA analysis is more suitable, well-known and widely used method for its simplicity to choose more influencing parameters (correlated parameters) that are responsible for watershed prioritization. Strongly correlated components (Dd, Rc, Re and Rb) are used for the compound parameter (Cp) and final priority (Rp) calculation. Low Cp value is suitable for water and soil conservation measure. Therefore, the corresponding low Cp has been taken as one for final priority ranking (Rp) purpose, then second lowest value as two, and so on.
Highlights
High inhabitant’s dilation, mercurial urbanization, climate change along with the jerky frequency, less vigor of rainfall make water management and storage plans difficult, but there is a compelling need for the appraisal of water resources for livelihood and economics all over the world (Singh et al 2014)
PCAbased analyses results (Table 10) reveal that parameters that have a strong correlation later are used for watershed prioritization after calculating the compound parameter (Cp) and priority rank (Rp) values (Table 12)
GIS- and RS-based morphometric studies were conducted to select watershed for water and soil conservation measures at the Plio–Pleistocene elevated tract in Bangladesh
Summary
High inhabitant’s dilation, mercurial urbanization, climate change along with the jerky frequency, less vigor of rainfall make water management and storage plans difficult, but there is a compelling need for the appraisal of water resources for livelihood and economics all over the world (Singh et al 2014). Different techniques are available for morphometric analysis, viz. Arc Hydro Tool, Ilwis, Basin 4, Arc GIS, HEC-GeoRAS, etc These softwares are used nowadays for automatic watershed extraction from digital elevation model (DEM). Javed et al (2011)and Puno and Puno (2019) have carried out watershed prioritization using morphometric analysis and land use/land cover (LULC) parameters. Watershed prioritization for soil erosion and water preservation purpose using the morphometric study. Three types of soil layer, namely clay (covering 93% area), marsh clay and peat Watershed character and their management require knowledge of topography, drainage network, water divide, channel length, geomorphological and geological setup of an area (Sreedevi et al 2013). Morphometric study will help for water resource management for this region
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