摘要
以赣江流域峡山站以上为研究区域,利用栅格型数字高程数据,提取数字流域水系及其空间拓扑关系,在此基础上建立数字水文模型.赣江上游峡山站以上集水区域包含21198个空间分辨率为30s的栅格,采用就近移植法将降水数据及蒸发数据插值到每个栅格上,计算峡山站的径流过程.日模型中选取1978～1985年为参数率定期,1986～1987年为参数验证期,以多年径流量误差最小为目标函数.次洪模型中采用前16场洪水用于参数率定,后6场用于模拟验证,以洪水总量、洪峰流量、峰现时间按许可误差统计合格率最高和确定性系数最大为目标函数.结果显示,率定期16场洪水中14场合格,验证期6场洪水均合格,表明栅格型新安江模型模拟效果良好.
On the basis of grid digital elevation data, the digital river network and spatial topological relation were generated over the area controlled by the Xiashan Hydrometry Station in the Ganjiang River Basin, including 21 198 grid cells at a resolution of 30s. The grid-based precipitation and evaporation data obtained from the nearest stations were applied to calculate the hydrograph at Xiashan Station. In daily mode, the duration from 1978 to 1985 was taken as the calibration period for the Xin＇anjiang Model with the objective function of minimal runoff error, the duration from 1986 to 1987 as the verification period of model parameters. In flood event-based mode, the 16 flood hydrographs were used for parameters calibration, and the other 6 hydrographs for model verification, by taking runoff depth, flood peak discharge, peak timing and model efficiency coefficient as the objective functions. The computational results show that 88% of the flood events for calibration are acceptable in the event-based mode, and other 6 flood events for verification are valid. Therefore, the grid-based Xin＇anjiang model performs well as applied in the study catch- ment.
出处
《水文》
CSCD
北大核心
2014年第4期28-31,60,共5页
Journal of China Hydrology
关键词
数字高程模型
新安江模型
日模型
次洪模型
参数率定
digital elevation model
Xin＇anjiang Model
daily model
flood event-based mode
parameters calibration
