首页|Linking basin-scale hydrology with climatic parameters in western Himalaya:Application of satellite data,temperature index modelling and in-situ observations
Linking basin-scale hydrology with climatic parameters in western Himalaya:Application of satellite data,temperature index modelling and in-situ observations
扫码查看
点击上方二维码区域，可以放大扫码查看
原文链接
万方数据
维普
Due to limited spatial and temporal in-situ runoff data availability,Himalaya-Karakoram(HK)glaciohy-drology 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 m3/s over 1950-2022,with maxi-mum runoff in summer-monsoon months,peaking in July(182.69 m3/s).Glacier runoff(ice melt+snowmelt over glacier)contributes maximum(39％)followed by equal contributions from snow-melt runoff from non-glacierized basin area and baseflow(25％),while rainfall-runoff contributes mini-mum(11％)to total runoff.There is a significant volumetric increase by～7％from pre-(59.17 m3/s)to post-2000(63.47 m3/s)mainly because of early onset of snowmelt post-2000 that resulted in a hydro-graph 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 Chandra-Bhaga Basin,showing the model robustness at a small catchment scale.
万方数据
维普
