摘要
应用数字高程流域水系模型,通过子流域和网格2种空间离散方式,采用传统的子流域法、雨量插值子流域法、逐个网格法3种雨量数据输入处理方法,分别作日流量模拟与洪水过程模拟,模拟过程与实测水文过程相比较表明:日模中3种雨量处理方法计算精度相当,次模中逐个网格法优于传统子流域法和雨量插值子流域法;降雨空间分布不均匀性考虑得越充分,水文过程模拟精度越高。
The Digital Elevation Drainage Network Model is used for the determination of raster flow vectors, the
delineation of subcatchments, and the extraction of river network from the digital elevation model data. On the basis
of two ways of spatial discretization: grid and subcatchment, three methods are applied to processing precipitation data
as the input of hydrological model, so as to analyze the effect of spatial precipitation heterogeneity on runoff process.
The first is the conventional subcatchment method by taking directly rain -gauge data measured within the
subcatchment as the input of the subcatchment. The second is modified subcatchment method by interpolating rain-
gauge data to each grid, then averaging rain values over all grids within a subcatchment as the input of the
subcatchment. The third is one-grid by one-grid method by taking rain value interpolated to a grid element as the
input of that element. Those three methods are utilized for the simulation of daily runoff and flood discharge,
respectively. A case study in the Baohe catchment shows that three methods make little difference in the computation
of daily discharge, while the one-grid by one-grid method performs better than the conventional subcatchment and the
modified subcatchment methods in flood discharge modeling in terms of model efficiency coefficient. The conclusion
can be drawn that the more sufficiently the spatial rain heterogeneity is taken into consideration, the higher the
accuracy of flood modeling is.
出处
《水文》
CSCD
北大核心
2004年第2期1-6,共6页
Journal of China Hydrology
基金
国家重点基础研究发展规划(973计划)资助项目(2001CB309404)
国家自然科学基金(40171016)
关键词
降水
空间分布
不均匀
径流
洪水
子流域
网格
离散
precipitation
spatial distribution
heterogeneity
runoff
flood
subcatchment
grid
discretization
