Implications of digital elevation models on habitat analysis of Golden Mahseer in the Upper Ganga Basin,India  

作　　者：J.P.Nale G.K.Pakhale 

机构地区：[1]Department of Civil Engineering,Indian Institute of Technology,Delhi,India

出　　处：《Water Biology and Security》2024年第4期44-54,共11页水生生物与安全（英文）

摘　　要：Aquatic habitat analysis is crucial in determining the relationship between river flow and habitat availability for aquatic species.This helps in identifying the environmental flow requirements of rivers.However,conducting habitat analysis in Indian rivers is challenging because of the unavailability of reliable and high-resolution terrain data.To address this challenge,a study was conducted to explore the possibilities of using Digital Elevation Models(DEMs)to extract required hydraulic data and to evaluate their accuracies.The extracted data were coupled with ecological data of a keystone fish species,namely Golden Mahseer(Tor putitora),to develop habitat analysis models for the Upper Ganga Basin(UGB)in India.The study adopted a hierarchical three-step approach for evaluating the accuracy and performance of DEMs as surrogate data sources.Firstly,cross sections at selected sites in the UGB were extracted from three different DEMs(SRTM,ASTER,and CARTOSAT)and evaluated against surveyed cross-section data with turning point tests and correlation coefficients.These data were then used to establish hydraulic and habitat analysis models.Four parameters(top width,flow cross-sectional area,hydraulic mean depth,and wetted perimeter)were evaluated using five error estimators to determine the accuracy and performance of hydraulic modelling.Finally,the hydraulic parameters were coupled with ecological requirements to develop a habitat model for different life stages of Golden Mahseer,namely fingerling,juvenile,and adult stages.We found that the SRTM predictions were better than those of the other DEMs,indicating its suitability to replicate channel geometry with higher accuracy,thus better predicting hydraulic parameters at all flow ranges.In habitat area estimation for adult Golden Mahseer,all the DEMs performed reasonably well(within±20%)within the flow range of 100 m3/s,which covers the low to average flow season.Beyond this flow range,ASTER and CARTOSAT resulted in considerable underestimations,averaging 22%and 54%,res

关 键 词：DEM Environmental flows(E-flows) Golden mahseer Habitat modelling Hydraulic modelling 

分 类 号：S92[农业科学—渔业资源]