Lijiang flood characteristics and implication of karst storage through Muskingum flood routing via HEC-HMS, S. China

Abstract We analyzed the characteristics of main karstic/non-karst reaches Lijiang River to uncover causes behind different flood behaviors by providing a better understanding formation. Having 63 years rainfall-runoff data and applying HEC-HMS model, geo/hydrological features were investigated. The available reservoir capacity karts (ARCK) was included through soil moisture accounting loss assess its impact. In particular, expected instantaneous peak discharge rates/times found largely imbalanced with generated unit hydrographs. Moreover, significant gaps among floods’ for subbasins in terms required modifications (2–4 times larger mid-upstream, respectively) mainly associated unique karst structure initial condition due various ARCK rainy/dry seasons. Besides, notable dissimilarities between wedge/prism storage volumes hydrograph’s wave traveling/receding time observed owing geomorphological conditions. Although contribution rates drivers formation cannot be quantitively modeled, based on our results emerged play substantial role forecasted results, comparatively. Our suggest that since varies, taking it into account (as abstraction) more reliable estimation. This underpinned which unmodified simulations had qualified rate 52% accuracy average increased 67.5% after inclusion. work adds body evidence illustrating hydrology, ignoring situational circumstances modeling might lead inaccuracies forecasting such dynamic watersheds.