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Study on Salt Water Intrusion of Estuary in Compound Channel

复合航道河口咸水入侵研究

基本信息

批准号：
14550517
负责人：
FUJIWARA Hirokazu
金额：
$ 2.24万
依托单位：
Hachinohe National College of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2004
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14550517/
关键词：
brackish lake compound channel salt water intrusion Corbicula japonica neural network density current horizontal mixing field measurement 塩分水温クロロフィルa 重回帰分析ファジイ推論塩水遡上狭窄部

项目摘要

In the regional development, a balance of development and preserving of natural resource should be considered. The precious natural environment has to be maintained. The Lake Ogawara in Aomori Prefecture is one of large brackish lake where the most dominant water organism for fishery is Corbicula japonica. Takase River connects the lake with the Pacific Ocean. The river is a tidal river with the compound channel. Filed measurement and laboratory experiments were carried out in order to understand mixing characteristics of river estuary in this research. Salinities of the lake were able to estimate from field data. The transverse mixing coefficients were obtained from these results using diffusion equation, and compared with those in compound channel. This result agreed with the conventional research. The mixing coefficients were related to the product density current parameter and cross-section of channel parameter. It was showed that the values of k_y/u_*h were related to the product β and d/D (k_y : transverse mixing coefficient, u_* : shear velocity, h : water depth, β : relative water level difference of fresh water and salt water, d : water depth of flood channel, D : water depth of main channel ). This result agreed with the values of k_y/u_*h required field measurement data. Therefore, it was found that Takase River estuary was influenced by compound channel from these results.The water quality and the flow of the lake is very related to the habitation of the clams. The field observation of water quality was carried out for this lake in the period for three years from August 2002. From a viewpoint of water quality environment, egg-laying and hatching of them are performed on the north side of the lake, and they diffuse throughout the lake by the flow.

在区域发展中，应考虑发展与保护自然资源的平衡。宝贵的自然环境必须得到保护。青森县的小川原湖是一个大型的半咸水湖，其中最主要的渔业水生生物是日本蚬。高濑川连接着湖泊和太平洋。该河为潮汐河，具有复式河道。为了解河口混合特性，本研究采用现场实测和室内试验相结合的方法。湖水的盐度能够从现场数据中估计出来。利用扩散方程得到了横向混合系数，并与复式槽道的横向混合系数进行了比较。这一结果与常规研究一致。混合系数与产品异重流参数和通道截面参数有关。结果表明，ky/u *h与β和d/D（ky：横向混合系数，u *：剪切流速，h：水深，β：咸淡水相对水位差，d：洪槽水深，D：主槽水深）的乘积有关。这一结果与现场实测资料所要求的k_y/u_h值相吻合。由此可见，高濑河口受复式河道的影响，湖泊的水质和流量与蛤类的栖息密切相关。从2002年8月开始，对该湖进行了为期3年的水质现场观测。从水质环境的角度来看，它们的产卵和孵化在湖的北侧进行，它们通过水流扩散到整个湖泊。