修正Streeter-Phelps模型及COD变化模型在三峡库区香溪河的应用

Hui Peng, Wei Yao, Ping Huang
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引用次数: 3

摘要

Streeter—Phelps模型作为一种常用的物理模型,具有较好的理论和实用价值,目前在水质研究中得到了广泛的应用。然而,在一些特殊水域,Streeter—Phelps模型的实用性受到限制,因为确认再生系数通常来自于水流速度快的河流试验,而不是考虑波浪效应。此外,在三峡库区湘溪河的实际研究中,COD的变化规律也出现了异常。在远离污染源的部分水域,COD随时间的变化值不符合指数衰减,而是在某一数值上略有波动。这一现象不能用先前修正的Streeter- Phelps模型来解释。研究表明,通过对再生系数的修正,可以获得较好的计算结果。同样,COD的变化规律不仅可以明确,而且可以为进一步研究污染喷射和泥沙运动规律提供科学依据。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Application of Modified Streeter-Phelps Model and COD Changing Model to Xiangxi River in Three Gorges Reservoir Area
As an often used physical model with good theoretical and practical values, Streeter--Phelps model has been widely used to research water quality at present. However, in some special water areas the utility of Streeter--Phelps Model suffers limitations because confirming reaeration coefficient often comes from tests in rivers with fast water flow speed rather than considering the wavy effects. Furthermore, in practical research in Xiangxi River in Three Gorges Reservoir Area the changing rule of COD appears abnormity. In some water areas far from pollution source the value of COD changing with time doesn't accord with exponential attenuation but slightly sways in a certain value. This phenomenon can not be explained by former modified Streeter--Phelps models. After research it indicates that through modifying the reaeration coefficient good calculation results will be obtained. Similarly, the changing rule of COD not only can be made clear but also can provide scientific evidence to further studying rules of pollution ejection and sediment motion.
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