000031190 001__ 31190
000031190 037__ $$aARTICLE--2015-017
000031190 041__ $$aEnglish
000031190 100__ $$aSavéan, M.
000031190 100__ $$aDelclaux, F.
000031190 100__ $$aChevallier, P.
000031190 100__ $$aWagnon, P.
000031190 100__ $$aGonga-Saholiariliva, N.
000031190 100__ $$aSharma, R.
000031190 100__ $$aNeppel, L.
000031190 100__ $$aArnaud, Y.
000031190 245__ $$aWater budget on the Dudh Koshi River (Nepal)
000031190 245__ $$bUncertainties on precipitation
000031190 260__ $$c2015
000031190 300__ $$a850-862
000031190 507__ $$aICIMOD staff, peerreviewed, KDLandS
000031190 520__ $$aAlthough vital for millions of inhabitants, Himalayan water resources remain currently poorly known, mainly because of uncertainties on hydro-meteorological measurements. In this study, the authors propose a new assessment of the water budget components of the Dudh Koshi River basin (3720km2, Eastern Nepal), taking into account the associated uncertainties. The water budget is studied through a cross analysis of field observations with the result of a daily hydrological conceptual distributed snow model. Both observed datasets of spatialized precipitations, interpolated with a co-kriging method, and of discharge, provided by the hydrological agency of Nepal, are completed by reanalysis data (NCEP/NCAR) for air temperature and potential evapotranspiration, as well as satellite snow products (MOD10A2) giving the dynamics of the snow cover area. According to the observation, the water budget on the basin is significantly unbalanced; it is attributed to a large underestimation of precipitation, typical of high mountain areas. By contrast, the water budget simulated by the modeling approach is well balanced; it is due to an unrealistic overestimation of the glacier melt volume. A reversing method led to assess the precipitation underestimation at around 80% of the annual amount. After the correction of the daily precipitation by this ratio, the simulated fluxes of rainfall, icemelt, and snowmelt gave 63%, 29%, and 8% of the annual discharge, respectively. This basin-wide precipitation correction is likely to change in respect to topographic or geographic parameters, or in respect to seasons, but due to an insufficient knowledge of the precipitation spatial variability, this could not be investigated here, although this may significantly change the respective proportions for rain, ice or snow melt. © 2015 Elsevier B.V.
000031190 653__ $$aCentral Himalaya
000031190 653__ $$aHydrological Distributed Snow Model
000031190 653__ $$aInput data reliability
000031190 653__ $$aPrecipitation
000031190 653__ $$aSnow cover area
000031190 653__ $$aWater budget in high mountains
000031190 773__ $$pJournal of Hydrology
000031190 773__ $$v531
000031190 8564_ $$uhttp://www.sciencedirect.com/science/article/pii/S0022169415008082$$yExternal link
000031190 8560_ $$fanil.jha@icimod.org
000031190 980__ $$aARTICLE