Linking basin-scale hydrology with climatic parameters in western Himalaya:Application of satellite data,temperature index modelling and in-situ observations  

作　　者：Smriti Srivastava MohdFarooq Azam Praveen Kumar Thakur 

机构地区：[1]The Wilkes Centre for Climate Science and Policy,University of Utah,Salt Lake City,USA [2]School of Environment,Society and Sustainability,University of Utah,Salt Lake City,USA [3]Department of Civil Engineering,Indian Institute of Technology Indore,India [4]Department of Water Resources,Indian Institute of Remote Sensing(IIRS),ISRO,Dehradun,India

出　　处：《Geoscience Frontiers》2024年第6期528-544,共17页地学前缘（英文版）

基　　金：the research grant from ISRO-RESPOND(ISRO/RES/4/690/21-22)and SERB(CRG/2020/004877)projects。

摘　　要：Due to limited spatial and temporal in-situ runoff data availability,Himalaya-Karakoram(HK)glaciohydrology has a significant knowledge gap between large-scale and small-scale runoff modelling studies.This study reconstructs longest basin-wide runoff series in Chandra-Bhaga Basin by applying a high-resolution glaciohydrological model SPHY(Spatial Processes in Hydrology)over 1950–2022.Two-tier model calibration is done using in-situ basin-wide runoff(1973–2006)and MODIS snow cover(2003–2018).Model validation is done against in-situ Chhota Shigri Glacier catchment-wide runoff(2010–2015).The modelled mean annual basin-wide runoff is 60.21±6.17 m^(3)/s over 1950–2022,with maximum runoff in summer-monsoon months,peaking in July(182.69 m^(3)/s).Glacier runoff(ice melt+snowmelt over glacier)contributes maximum(39%)followed by equal contributions from snowmelt runoff from non-glacierized basin area and baseflow(25%),while rainfall-runoff contributes minimum(11%)to total runoff.There is a significant volumetric increase by∼7%from pre-(59.17 m^(3)/s)to post-2000(63.47 m^(3)/s)mainly because of early onset of snowmelt post-2000 that resulted in a hydrograph shift by∼25 days earlier in spring.The glacier runoff is overestimated by 3%from RGI 7.0 inventory compared to different manually delineated inventories over 1950–2022,because of higher glacierized area from RGI 7.0.The precipitation shows a negative trend,but total runoff shows a positive trend due to positive trend of temperature that resulted in more glacier runoff and rainfall-runoff for basin over last 72 years.Basin-wide runoff is mainly governed by summer temperature which directly controls the amount of glacier and snowmelt runoffs and is supported by summer rainfall.This study highlights importance of basin-scale model calibration with in-situ data in large scale studies and stresses the need for in-situ observations in high-altitude Himalayan region.Basin-scale calibrated model parameters are transferable to glacier catchment scale within Chandr

关 键 词：HIMALAYA Glaciohydrological model Glacier runoff BASEFLOW Pre-and post-2000 Chandra-Bhaga Basin 

分 类 号：P314[天文地球—固体地球物理学]