水利水电科技进展2017，Vol.37Issue(6)：1-8,43,9.DOI:10.3880/j.issn.1006-7647.2017.06.001
考虑边界反射的河流离岸排放污染混合区计算方法
A calculation method of pollutant mixing zone for off-bank discharge considering boundary reflection in a river
摘要
Abstract
Under the circumstances that equal intensity point source is discharged off-bank in rivers of medium width with the consideration of the reflection of both banks,a calculation method of pollutant mixing zone was derived from the analytical solutions of the simplified two-dimensional advection-diffusion equation.The form of the boundary shape curves and the non-dimensional equation of the pollutant mixing zone were obtained.Using the methods of iterative calculation and trial calculation,pollutants mixing zones of river bank and off-bank were identified.The relationship between the geometric characteristic parameters (coordinates),the area and area coefficient of the zone,and the relative off-bank distance were found.As a result,the relative off-bank distance a'was proposed as a classification criterion of discharge types.The classification criteria for river bank,off-bank and river center discharge types are as follows:①for 0 ≤ a'≤ a'1,the outfall can be simplified as the type of river bank (near-bank) discharge;②for a'1 ＜a'＜a'2,it is named as the type of off-bank discharge;③for a'2≤a'≤0.5,the outfall can be simplified as the type of river center discharge,and the expressions of a'1 and a'2 have been put forward to represent the classification lines of the river bank and off-bank discharge,off-bank and river center discharge respectively.By regression analysis,an empirical formula of the main characteristic parameters for off-bank discharge in pollutant mixing zone in rivers of medium width is proposed,which provides the basis for the optimization of outfall locations and for the calculation of pollutant mixing zone.关键词
中宽河流/离岸排放/边界反射/污染混合区/排污口分类准则/几何特征参数计算/实用计算公式Key words
rivers of medium width/off-bank discharge/boundary reflection/pollutant mixing zone/sewage outfall classification criterions/calculation of geometric characteristic parameters/empirical formula分类
资源环境引用本文复制引用
武周虎..考虑边界反射的河流离岸排放污染混合区计算方法[J].水利水电科技进展,2017,37(6):1-8,43,9.基金项目
国家自然科学基金(51379097) （51379097）
