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，必须考虑保护自然资源的平衡。青森县小河原湖是大型咸水湖之一，其中最主要的渔业水生物是蚬。高濑河将湖泊与太平洋连接起来，该河是一条具有复合河道的潮汐河流，为了了解该河口的混合特征，进行了现场测量和室内实验。研究人员可以根据现场数据估算出横向混合系数，并与复合河道中的结果进行比较。混合系数与混合系数相关。乘积密度电流参数和通道截面参数表明，k_y/u_*h的值与乘积β和d/D有关（k_y：横向混合系数，u_*：剪切速度，h）：水深，β：淡水和咸水相对水位差，d：泄洪道水深，D：主河道水深），该结果与现场实测数据所需的k_y/u_*h值一致。结果发现，高濑河河口受到复合河道的影响。该湖的水质和流量与蛤类的栖息地有很大关系。从八月起三年2002年，从水质环境来看，它们的产卵、孵化均在湖的北侧进行，并随水流扩散到全湖。