摘要:
流域地形指数水文模型TOPMODEL已被应用于陆面模式(Land surface Models, LSMs)以改进陆面模式对水文过程的模拟。地形指数(ln(α/tanβ))是TOPMODEL的核心，是进行水文分析的重要指标。因此，高效的提取地形指数信息非常重要。本文将淮河流域作为案例区，以地形指数单流向算法为理论基础，利用ArcGIS9的Model Builder建模工具，建立地形指数提取模型。在模型设计过程中充分考虑到汇流面积、坡度等参数的有效性，使模型具有较高的通用性。使用者启动模型加载数据即可简单又快速地获得地形指数分布数据。
River terrain index TOPMODEL hydrological model has
been applied to Land surface model (Land
surface Models, LSMs), to improve Land surface of hydrological process
simulation model. The core of TOPMODEL is terrain index (ln(α/tanβ)).
And it is an important index on the hydrologic analysis. Therefore, effective
extracting terrain index information is very important. In this paper, the
huaihe river basin as a case area, the terrain index extraction process model is
build, using the ArcGIS9 Model Builder tools. This model is based on a single
flow algorithm for calculating process. Model has higher versatility, because
of fully considering the effectiveness of the parameters such as the slope and
the flow accumulation in the model design process. Using this model can be very
simple and quick to get terrain exponential distribution data of terrain index.