| Cite this article: | 黄泽群,廖春花,陈玉贵,等.新水文地理数据集的研究与应用——以洞庭湖水系为例[J].灌溉排水学报,0,():-. |
| huangzequn,liaochunhua,chenyugui,et al.新水文地理数据集的研究与应用——以洞庭湖水系为例[J].灌溉排水学报,0,():-. |
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| DOI： |
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| Research and Application of A New Hydrographic Datasets: A Case Study in Dongting River Basin |
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huangzequn1, liaochunhua1, chenyugui1, zhaoenrong2, chenweitian3, luohongmei1, xieruiheng1
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1.Hunan Meteorological Service Center;2.Hunan Meteorological Observatory;3.School of Atmospheric Science, Sun Yat-sen University
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| Abstract: |
| Abstract:【Objective】The high-resolution hydrographic datasets have significantly influence on hydrological simulation, such as runoff in flood inundation modeling.【Method】In this study, we derived a new raster hydrography map (flow direction, flow accumulation, drainage area and flow distance etc.) in Dongting river basin from MERIT DEM data (~90m) which is a latest released digital elevation model.【Result】The new hydrographic databases show some big difference in terms of DEM, flow direction, river network structure and river length compared to the traditional databases (HydroSHEDS). The results of the hydrological model show that the daily and monthly Nash coefficients of the MERIT datasets are 0.41 and 0.52, respectively, which are better than HydroSHEDS.【Conclusion】The MERIT can more realistically reflect the location of the river in the study area and provide for many applications to reduce uncertainties. The new hydrography map has been applied to the surface rainfall forecast system and flood and drought disaster prevention platform, which will be available for academic research and education purpose. |
| Key words: DEM; flow direction; river network; drainage area; hydrometeorological services |
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