CLC number:
On-line Access: 2022-06-22
Received: 2021-10-26
Revision Accepted: 2022-05-23
Crosschecked: 2022-09-22
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Jun ZOU, Jian-min ZHANG, Chang-yuan LI. Effects of the mixing degree upstream of the diverging area on the pollutant allocation characteristics of a braided river[J]. Journal of Zhejiang University Science A,in press.Frontiers of Information Technology & Electronic Engineering,in press.https://doi.org/10.1631/jzus.A2100540 @article{title="Effects of the mixing degree upstream of the diverging area on the pollutant allocation characteristics of a braided river", %0 Journal Article TY - JOUR
分流区前混合度对分汊河流分污特性的影响机构:1四川大学,水利水电学院,中国成都,610065;2江西省水利科学院,中国南昌,330029 目的:分汊河流支汊间的污染物分配规律具有重要意义。同时,分污特性受诸多因素影响,因此较为复杂。本文旨在探讨在具有分汊结构的河流中,分流区前污染物混合度对下游支汊分污比的影响。研究与排放位置相关的混合度的定义、量化以及与分污比的规律关系,以进一步认识分汊河流污染物扩散影响因素的作用机制。 创新点:1.建立水质物理模型,得到在排放位置影响下支汊分污比的变化情况。2.基于高斯分布,定义分流区前混合度,并得到无量纲化的混合度与分污比偏离量的线性关系。3.得出在线性关系中线性系数受分汊角的影响情况。 方法:1.建立包含6种分汊形式与多种排放位置的水质物理模型,得到排放位置与分污比的关系(图9~14);2.基于分流区前断面浓度分布的试验成果,借助高斯分布公式定义分流区前混合度(图16);3.通过无量纲化处理,得到分流区前混合度与分污比偏离量的关系(图18~29)。4.通过数据分析,构建线性关系中的系数与分汊角的关系。 结论:1.与纵向排放距离高度相关的分流区前混合度显著影响分污比;混合度越低,分污比偏离相应分流比的幅度越大。2.无量纲化的混合度与无量纲化的分污比偏离量呈现近似线性关系。3.线性关系中的截距和斜率与分汊角相关,并以对称分汊角为界呈现相反的单调性。 关键词组: Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article
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