基于GIS的洪水演进系统的初步研究

Primary study of the flood development deducing system based on GIS

论述了基于GIS的水力学预报系统,分析了在WebDB数据库的支持下,如何更加及时地进行洪水分析预报。以圣维南方程组为基础,介绍了按Preissmann加权四点隐式格式进行离散得线性代数方程组的追赶法模型。该算法简单明了,易编通用程序,而且计算的舍入误差小,数值稳定性好,有较好的开发应用前景。

This paper discussed the GIS model forecast system and analyzed it, with support of WebDB database model, how to analyze more efficiently and betimes. Based on the SaintVenant equations, the linear equations from the chase model were deduced by using Preissmann Weighted implicit fourpoint scheme. This method is simple and easy to develop. Meanwhile, it has few computation error, good numeric stability and nice prospect in this field.