区域尺度分布式水文模拟的时空分辨率

Study on Spatiotemporal Resolution for the Regional Distributed Hydrological Simulation

基于数据实验,就区域尺度分布式水文模拟中时空分辨率匹配问题进行讨论,就分布式水文建模中时空分辨率匹配问题提出建议。结果表明:低分辨率高程数据在区域水文要素空间离散过程中,导致边界错位、高程趋于集中、坡度变缓、河网稀疏失真等不良后果,在区域水文模拟研究中,应根据不同时间尺度对应的科学计算需求,选择适宜的空间分辨率数据进行模型平台构建。

As the key factors of hydrological simulation, the spatiotemporal resolutions based on one modeling framework are very important and complex during the modeling. To the current hot research field of distributed hydrological resolution, this paper makes some conclusions based on the experimental data, the temporal and spatial resolutions in the distributed hydrological resolution are discussed, and some suggestions are put forward. Data experiment results reveal that the low spatial resolution brings about some inaccurate results, such as the false drainage basin boundaries, centralized elevations, mitigated slopes and low river density during the hydrological modeling. Furthermore, the spatial processing precision of hydrological factors is closely related to the scale of electronic data. Many factors are needed in calculating the hydrological process at regional scale. Therefore, the feasible spatial resolution should be selected according to the scientific issues related to different temporal scales during the hydrological modeling.