一、引 言 近十几年来,由于环境保护和管理的迫切需要和电子计算机的迅猛发展,污染扩散的数值研究获得重大的进展.国外不少学者曾做过自然水域的污染扩散数值研究,他们所建立的模型从一维定常解扩展到二维非定常解.目前鉴于三维流动模型仍很不完善,现行的模型大多数限于二维单层的或者分层的.模拟的污染指标,由保守性物质扩充到非保守性物质.在以往研究成果的基础上,环境数值模拟方法逐渐进入实用阶段.目前,一些工业 I. INTRODUCTION In the recent ten years, due to the urgent need of environmental protection and management and the rapid development of electronic computers, great progress has been made in the numerical study of pollution spread. Many foreign scholars have done numerical research on the pollution spread in natural waters. The established model extends from one-dimensional steady solution to two-dimensional unsteady solution.At present, the three-dimensional flow model is still not perfect, most of the current models are limited to two-dimensional single-layer or layered.The simulation of pollution indicators by the conservative Material expansion to non-conservative material.On the basis of previous research results, environmental numerical simulation methods gradually into the practical stage.At present, some industries