Research of grid size issue on applying TOPMODEL in Chaohe catchment
Estimation of the topography index is a key problem for TOPMODEL modeling performance. Besides the calculation method, the distribution of topographic index is closely linked to the DEM scale. The paper analyzed the change of the topographic index with different grid scale (ranging from 50 m to 600 m at 50 m intervals) and applied the methodology on a medium-size watershed-Chaohe catchment of 5340 square kilometers. The TOPMODEL was used to simulate daily hydrological process and to study the impact of DEM scale on topographic index and rainfall-runoff simulation. The results show that the distribution of the topographic index is very sensitive to the DEM scale. The area percentage of high topographic index increases with the DEM scale, which result in more accurate simulation of runoff during drought period with DEM scale larger than 300 m. On the other hand, more accurate simulation of the flood peak coincides with poorer simulation of daily discharge with the same grid scale.
topographic indez TOPMODEL Hydrological model scale study
Qinge LIU Xiaohui LEI Yu TIAN Yunzhong JIANG Jun XIA
Center for Water Resources and Environment,Sun Yat-sen University,Guangzhou 510275,China Guangdong T China Institute of Water Resource and Hydropower Research,No.20 Chegongzhuang West Road,Haidian Dist Key Lab.of Water Cycle& Related Surface Processes,Institute of Geographical Sciences and Natural Res
国际会议
The Four Conference of Asia Pacific Association of Hydrology and Water Resources(亚太地区水文水资源协会第4届科学大会)
北京
英文
74-79
2008-11-03（万方平台首次上网日期，不代表论文的发表时间）