摘要:
本文在河网水流数学模型和河道水体自净规律研究基础上,提出了河网水质模拟数学模型:以及单位时间内河网最大允许排污量计算数学模型:目标函数max·W_T=sum from i=1 to n W_i;水质约束条件。计算时,可分别以BOD水质目标(L·)、DO水质目标(O·)为约束条件,也可同时以BOS和DO水质目标为约束条件。本文以王业和人口集中、污染严重的杭州运河河网区为倒,计算了两种水质目标下不同引水方案的最大允许排污量,揭示了数学模型在河网治理工程环境效益评价及方案优化等方面的应用。
Abstract:
On the basis of the study on flow mathematical model and self-purificationof waterbody for river reticulation systems in a plain, this paper presents amathematical model of water quality simulation. RL = u·W + m and RO = v·W+ n, and mathematical model for calculating maximum allowable discharge ofa river network in a unit time :Aim function max WT=·Wi and the con-straint conditions of water quality. u·W + m≤RL0 and v·W+n≥RO0It is possible to calculate the function by taking either BOD5 or DO of the water quality aim as the constraint condition separately, or both of them at the same time. By linearizing the above-mentioned function, resolving the linear function by improving method of a simple standard form and using the water quality modeling result as the rectification,we can, at the fixed water quality aim, obtain total allowable discharge amount or water environmental capacity in the rivtr network. Taking the river network cf the Grand Canal(Hangzhou section)as an example,the paper, calculates maximum allowable discharge under different diversion plan of two kinds of water quality aims. Also the paper reveals the application of mathematical model for river network in the respects of environmental benefit assessment of controlling engineering, plan optimization and so forth.
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