Abstract: The concept of dynamic digital terrain model (DDTM) is proposed. The main idea of DDTMis to describe the terrain surface processes by establishing the calculating rules among the related surface factors, which mainly influence the surface processes such as slope, precipitation, soil, etc. In DDTM, regular grid is taken as the unit to present natural processes, and the calculating rules arethe functions of time, which decides the simulation process to be dynamic. Hydrological rainfall run off process is used as atypical example to illustrate the principal of DDTMin the experiment. The result showsthat DDTMis ableto simulate terrain surface processes.

Key words: dynamic digital terrain model, hydrological process, runoff generation

摘要： 提出建立动态数字地形模型的概念。通过对各类地表相关信息的描述和关联, 建立其内在的计算规则。可以用于模拟水文过程中复杂、非线性的动态变化。在动态地形模型中, 以规则网格为计算单元, 通过计算规则描述了模拟过程的动态变化。以产汇流为例, 阐述了利用动态地形模型模拟的方法, 取得了初步效果, 为在该方向的深入探索提供了一条可参考的思路。

关键词: 动态数字地形模型, 水文过程, 产汇流