摘要
选取汉江上游汉中水文站以上集水面积为研究区域,基于栅格型数字高程数据,利用数字高程流域水系模型,生成栅格水流流向,构建数字流域水系及空间拓扑关系;然后将逐步插值法处理后的栅格型降雨数据作为研究区内每一栅格单元上的雨量输入,并在各栅格上应用新安江降雨径流模型进行产流计算;再运用考虑区间侧向入流的Muskingum Cunge法在栅格水系上进行"先合后演"的洪水演算,从而获得汉中站的流量过程.结果表明,栅格型水文模型不仅能演算出流域出口断面处的流量过程,还能方便地计算流域内各支流任一栅格点上的流量过程.
On the basis of grid digital elevation data, the grid flow vector, digital basin and spatial topographical structure were generated for the upper catchment of the Hanzhong hydrological station on the upper Hanjiang River by use of the Digital Elevation Drainage Network Model for river basins. The grid precipitation data after step-by-step interpolation were taken as the input of the Xin′anjiang model for runoff calculation for each grid element. Then, the Muskingum-Cunge method, considering the lateral inflows, was applied to flood routing on the platform of grid drainage network, and a grid-based hydrological model with high precision was derived. The model is not only able to route the discharge hydrograph for the outlet section of the catchment, but also capable of computing the discharge fluctuation at any grid of different tributaries in the catchment. As a result, the grid-based digital basin coupled with the grid-based hydrological model is of certain theoretical value and practical significance to deepen understanding of hydrological physical mechanism, water resources management, and flood prevention in the catchment.
出处
《河海大学学报（自然科学版）》
CAS
CSCD
北大核心
2004年第5期483-487,共5页
Journal of Hohai University(Natural Sciences)
基金
国家重点基础研究发展规划("973"计划)资助项目(2001CB309404)
国家自然科学基金资助项目(40171016)
关键词
数字高程模型
数字流域
水系
水文模型
汇流
洪水
digital elevation model
digital river basin
channel network
hydrological model
runoff
flood
