Identification and calibration of snow parameters for a distributed conceptual hydrological model using the MODIS snow cover images
Abstract
Snow cover maps have been proven to provide the potential in hydrologic applications of assessing the snow resources, while they only give the spatial extent of the snow cover. In recent years, numerous studies have demonstrated the high accuracy of the Moderate Resolution Imaging Spectroradiometer (MODIS) snow cover images.
In this study, the MODIS (collection 6) snow cover images were applied to calibrate the distributed HBV hydrological model with 6 versions of snow-melt modules. This application was carried out in a small headwater basin of Austria. The basin was gridded into 341 elevation pixels with 1 km resolution. The 6 versions of snow-melt modules were 1) original degree day factor (DDF) method with one permanent factor; 2) DDF monthly temporally changed with clear-sky solar radiation (RAD); 3) DDF hourly temporally changed with RAD; 4) DDF spatially changed with annual RAD; 5) DDF spatially and monthly temporally changed with RAD; 6) DDF spatially and hourly temporally changed with RAD. All the relations between the DDF and RAD were linearized as two parameters in the snow-melt module. All the parameters in the snow-melt module were calibrated and validated with two approaches, single objective optimization (against gauged discharge at outlet) and multi-objective optimization (against gauged discharge at outlet and MODIS snow cover images). Results showed that using the MODIS snow cover images in the calibration could improve the accuracy of the snow modelling with earlier start of snow melt. The DDF spatially and monthly temporally changed with RAD had better performance in both single and multiple objective calibration and validation, followed by the DDF monthly temporally changed with RAD and the DDF spatially and hourly temporally changed with RAD.- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2018
- Bibcode:
- 2018AGUFM.H33I2203T
- Keywords:
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- 1836 Hydrological cycles and budgets;
- HYDROLOGYDE: 1840 Hydrometeorology;
- HYDROLOGYDE: 1848 Monitoring networks;
- HYDROLOGYDE: 1855 Remote sensing;
- HYDROLOGY