区域尺度降雨径流估算方法研究Ⅰ-算法设计

径流是区域水土流失的基础。基于已有试验研究和观测数据,结合GIS空间分析功能,初步提出了区域径流计算的基本思路,并对降雨径流产生的各个环节做出了算法设计,考虑的过程包括降水、植被截留、入渗、微地形存储、地表径流等。基于DEM将流域划分为规则网格并以此为基本计算单元,将月降水过程划分为若干时段作为计算迭代的基本单元,本算法可以计算出区域内每一网格单元任一时段末的地表径流量,为进一步建立区域水土流失模型奠定了基础。

Runoff is an essential factor for regional soil and water loss.A set of algorithm for regional runoff estimation is initially designed based on the previous research,incorporated with GIS function.The process considered includes precipitation,interception,infiltration,storage in micro depressions,overland flow and so on.The region is divided into regular cells based on DEM,and the monthly process of rainfall is divided into time steps.The individual cell and time step are regarded as basic computing units.R...