Comprehensive analysis for water environment in Lake Teganuma with field measurements, numerical computations and GIS.

利用实地测量、数值计算和GIS对手贺沼湖水环境进行综合分析。

• 批准号: 16560453
• 负责人: NIHEI Yasuo
• 金额: $ 2.37万
• 依托单位: Tokyo University of Science
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2004
• 资助国家: 日本
• 起止时间: 2004 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-16560453/
• 关键词: Lake Teganuma; Eutrophied lake; water environment; pollutant load; field measurement; numerical simulation; GIS; water quality; 湖沼; 都市河川; 富栄養化

To realize an integrated management for water quality on the basin scale of Lake Teganuma which is one of famous eutrophied lakes in Japan, the comprehensive analysis for water environments in Lake Teganuma were conducted with field measurements, numerical computations and GIS. Main results of the project are expressed in the followings :1)Several monitoring methods to measure pollutant loads were newly developed. These monitoring methods were used to conduct accurate and simplified measurements for road-deposit environments and pick-up and deposition rates of sediments in rivers.2)To clarify the pollutant loads in urban area, the field measurements for the non-point sources on roads and roofs were done with a MOS (Modeled-stormwater sampling) technique presented in this project. The observed results gave the relationship between the unsteady processes of road- and roof-deposit loads and main sources like dry fallout and traffic volume.3)To measure accurately pollutant loads in rivers, the measuring methods with an ADCP (Acoustic Doppler current profiler) and an optical sensor for turbidity and Chlorophyll-a were discussed through the various field tests in the Oohori River, one of main influent rivers into Lake Teganuma.4)Nutrient releases from the bottom and suspended solids in the lake were examined in the field measurements and laboratory experiments. These results indicate that the nutrient release in the lake was 30-50% of total pollutant loads.5)A new simplified horizontal coordinate for computations of river flow, named a horizontal sigma coordinate, was presented. Furthermore, to perform a computation of water environments in lake with accurately evaluating pollutant loads, a coupled river-lake model was also developted by introducing a horizontal sigma coordinate into the river-flow model.

为实现日本著名富营养化湖泊Teganuma湖流域尺度的水质综合管理，采用野外实测、数值计算和GIS技术对Teganuma湖的水环境进行了综合分析。主要成果如下：1)新开发了几种污染物负荷监测方法。这些监测方法用于对道路沉积物环境和河流沉积物的吸收和沉积速率进行精确和简化的测量。2)为了明确城市地区的污染物负荷，本项目采用MOS（模拟雨水采样）技术对道路和屋顶上的非点源进行了现场测量。观测结果给出了道路和顶沉积物荷载的非稳态过程与干沉降物、交通量等主要荷载源的关系。3)为了准确测量河流中的污染物负荷，通过对teganuma湖主要入水河之一的Oohori河进行了多次现场试验，探讨了ADCP （Acoustic Doppler current廓线仪）和光学传感器对浑浊度和叶绿素-a的测量方法。4)通过现场测量和室内实验，对湖底营养物和悬浮物的释放情况进行了研究。这些结果表明，湖泊中养分释放量占总污染物负荷的30-50%。5)提出了一种新的河流流量计算的简化水平坐标，称为水平sigma坐标。此外，为了对湖泊水环境进行计算，准确地评估污染物负荷，还在河流模型中引入了水平西格玛坐标，建立了河湖耦合模型。

项目成果

複数の都市河川における降雨時水質環境の比較解析

城市多条河流降雨期间水质环境对比分析

• 发表时间: 2005
• 期刊: 土木学会水工学論文集 49・2
• 作者: 今野;二瓶;大竹;水口
• 通讯作者: 水口

Study of temporal and spatial variations of road-deposit environments with modeled-stormwater sampling technique

利用模型雨水采样技术研究道路淤积环境的时空变化

• 发表时间: 2006
• 期刊: J.of Japan Society on Water Environment Vol.29, No.5
• 作者: Y.Nihei;T.Sunada;T.Mizuno
• 通讯作者: T.Mizuno

模擬降雨流出水採取法に基づく路面塵埃環境の時間的・空間的変動特性の把握

基于模拟降雨径流采样方法了解道路扬尘环境时空变化特征

• 发表时间: 2006
• 期刊: 水環境学会誌 29・5
• 作者: 二瓶泰雄;砂田岳彦;水野智之
• 通讯作者: 水野智之

A simplified monitoring method with a bed-slot sampler for bed-load discharge

床荷排放床槽取样器的简化监测方法

• 发表时间: 2005
• 期刊: Advances in River Eng., JSCE Vol.10
• 作者: Y.Nihei;R.Nushi
• 通讯作者: R.Nushi

夏季手賀沼における外部流入・内部生産負荷に関する検討

手贺沼夏季外部流入量和内部生产负荷研究

• 发表时间: 2005
• 期刊: 土木学会水工学論文集 49・2
• 作者: 二瓶;丸山;尾関;山崎
• 通讯作者: 山崎