Revisiting a Simple Degree-Day Model for Integrating Satellite Data: Implementation of Swe-Sca Hystereses

Journal of Hydrology and Hydromechanics

Thirel Guillaume¹  Riboust Philippe²  Moine Nicolas Le²  Ribstein Pierre² 

[1] Hydrosystems and Bioprocesses Research Unit (HBAN), Irstea, 1 rue Pierre-Gilles de Gennes, CS 10030, 92761Antony Cedex, France;Sorbonne Universités, UPMC Univ., Paris 06, CNRS, EPHE, UMR 7619 Metis, 4 place Jussieu, 75005Paris, France;

关键词: snow model;    hysteresis parametrization;    modis snow cover area;    rainfall-runoff model;   

DOI  :  10.2478/johh-2018-0004

来源: DOAJ

【 摘 要 】

Conceptual degree-day snow models are often calibrated using runoff observations. This makes the snow models dependent on the rainfall-runoff model they are coupled with. Numerous studies have shown that using Snow Cover Area (SCA) remote sensing observation from MODIS satellites helps to better constrain parameters. The objective of this study was to calibrate the CemaNeige degree-day snow model with SCA and runoff observations. In order to calibrate the snow model with SCA observations, the original CemaNeige SCA formulation was revisited to take into account the hysteresis that exists between SCA and the snow water equivalent (SWE) during the accumulation and melt phases. Several parametrizations of the hysteresis between SWE and SCA were taken from land surface model literature. We showed that they improve the performances of SCA simulation without degrading the river runoff simulation. With this improvement, a new calibration method of the snow model was developed using jointly SCA and runoff observations. Further analysis showed that the CemaNeige calibrated parameter sets are more robust for simulating independent periods than parameter sets obtained from discharge calibration only. Calibrating the snow model using only SCA data gave mixed results, with similar performances as using median parameters from all watersheds calibration.

【 授权许可】

Unknown