基于GEOCA和GIS的土壤侵蚀空间演化模拟

传统的土壤侵蚀研究主要是运用水土流失通用方程,对研究区域的各种影响指标进行研究并取一定的数值,计算其侵蚀量.实际上,土壤侵蚀是1个影响因素众多,边界条件复杂的连续不间断的不确定过程.研究了用地理元胞自动机来模拟土壤侵蚀的原理、方法和工作流程,并在GIS技术支持下采用标准的Von.Neumann邻居定义,着重探讨元胞状态转化所遵循的规则和土壤侵蚀从1种强度到另1种强度这一微观动态变化过程,最终形成GeoCA-Soil Ero-sion系统.以重庆合川市为例,用元胞空间与研究区域相一致的地理元胞自动机模型,得出了重庆合川市土壤侵蚀等级图并分析了土壤侵蚀与其背景的空间关系.并运用ArcView软件作为开发平台与之集成,将这一过程可视化表达.

SPATIAL EVOLUTION SIMULATION OF SOIL EROSION BASED ON GEOCA AND GIS

The traditional method for the analysis of soil erosion normally uses the current equation to investigate the factors influencing soil erosion of the object -region. However, soil erosion is an indefinite complicated process consisting of various factors and complicated border conditions. This paper describes how to use GEOCA to simulate soil erosion and expatiates its principles, ways and flow. Sustained by GIS and adopting Von. Neumann neighbor, this paper focuses on the rule and the dynamic micro - change processes from one state to another in order to form a GEOCA - SOIL EROSION system. Used in a case study of Hechuan, Chongqing, this system has yielded a soil erosion map and analyzes the relationship with its background. This process can be visualized with the integration of GIS and GEOCA technology.