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the grand canal hangzhou section
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     grand tribulation;
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The water environment of the Grand Canal(Hangzhou Section) and its relation to the iron and manganese content were studied in this paper. The total ion content in the water body effects the solubility of iron and manganese directly. The high oxygen demand due to higher organic content and its reducing property makes the iron and manganese ion at the lower valence state and increases the solubility. Besides, the suspended matter and the water temperature are also associated with the iron...

The water environment of the Grand Canal(Hangzhou Section) and its relation to the iron and manganese content were studied in this paper. The total ion content in the water body effects the solubility of iron and manganese directly. The high oxygen demand due to higher organic content and its reducing property makes the iron and manganese ion at the lower valence state and increases the solubility. Besides, the suspended matter and the water temperature are also associated with the iron and manganese content which exceeded the standard of the drinking water in the. Grand Canal(Hangzhou Section).

本文研究了运河(杭州段)的水介质环境及其与水体中铁锰含量的关系,研究结果表明,运河(杭州段)中的铁锰含量明显地受水介质环境的控制。水体中的离子总量直接影响铁锰的溶解度;较高的耗氧量使水介质具还原性,从而使铁锰离子呈低价态稳定地存在于水中;另外,悬浮物和水温也与运河(杭州段)中铁锰含量超过饮用水标准有一定的联系。

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...

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.

本交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。

With the Grand Canal ( Hangzhou Section ) as an object, the geochiemical behaviour of arsenic after going into the river from different sourqes and the accumualated process of arsenic in the river mud are studied systematically. Based on the study of the feature of the arsenic content distribation of the soil and the underground water on both sides of the river, and combining the investigation data of tne children health in the area affected by arsenic pollution, the effects of the accumulation...

With the Grand Canal ( Hangzhou Section ) as an object, the geochiemical behaviour of arsenic after going into the river from different sourqes and the accumualated process of arsenic in the river mud are studied systematically. Based on the study of the feature of the arsenic content distribation of the soil and the underground water on both sides of the river, and combining the investigation data of tne children health in the area affected by arsenic pollution, the effects of the accumulation of arsenic in the river mud on the environment have been discussed, and thus the scientific support for harnessing the river polluted by arsenic is provided.

本文以我国大运河(杭州段)为研究对象,系统地分析了不同来源的砷进入河流后的地球化学行为以及砷在河流污泥中的积累过程。通过对河流两侧土壤和地下水中砷的含量分布特征的研究,结合对受砷污染影响区儿童健康的调查资料,讨论了河流污泥中砷的积累对环境的影响,从而为治理受砷污染的河流提供科学依据。

 
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