Study on the Ecosystem and its Physical Structure of the Creek

溪流生态系统及其物理结构研究

• 批准号: 06650560
• 负责人: NAKATANI Tsuyoshi
• 金额: $ 1.28万
• 依托单位: Gifu University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06650560/
• 关键词: Creek; Ecosystem; Habitat Hydraulics; 近自然型河川工法

The field studies have been made on the ecosystem and water temperature change of the creek in the Nagara-River. The site of the creek is located at 15.6km upstream from the river-mouth. Because of operation of the Nagara-River Wier, this area have been changed to the fresh water from estuary. The size of creek is 800m in length along the river. The average depth was 1.0m at the entrance, 1.8m at the middle portion, and 0.8m in the end of the creek. The conclutions have been obtained from the research as follows ;(1) Bird-Watching : 30 kind of birds have been observed along the downstream of the Nagara-River in 2km distance, according to the previous research. Almost one third of them were found in the creek. It has been understood that the creek plays an important role of birds habitat.(2) Benthos and Sediments Analysis : The density of crabs in the creek were investigated. It was found out that the density was increased in comparison with the results in 1992. This may be explained that the land area of the creek was decreased due to a rise of the water level by the Wier. It was recommended to monitor the change of crabs density for a few years to evaluate the effect of environmental change.The pH and microorganism activity analysis in the sediments were checked. The pH were observed within the range of 6.1 to 7.7. The activity of microorganism was found to be higher at the vicinity of plants root and a habitat area of crabs.(3) Thermal conditions : Water temperature was measured for two weeks in autumn and four weeks in winter seasons. It was found out that the characteristics of the water temperature in the creek is similar to the one in the lake and reservoir rather than river.

对长良川溪流的生态系统和水温变化进行了实地研究。溪址位于河口上游15.6km处。由于长良河的运行，该地区已被改变为河口的淡水。小溪的大小是800米长沿着。河口平均水深为1.0m，中部平均水深为1.8m，末端平均水深为0.8m。本研究主要取得以下结论：（1）观鸟：根据前人的研究，在长良川下游沿着2km范围内，共观察到30种鸟类。其中近三分之一是在小溪里发现的。据了解，小溪起着鸟类栖息地的重要作用。(2)底栖生物和沉积物分析：调查了小溪中螃蟹的密度。结果发现，与1992年的结果相比，密度有所增加。这可以解释为，由于威尔河的水位上升，小溪的陆地面积减少了。建议通过连续几年的蟹类密度变化监测来评价环境变化的影响，并对沉积物进行pH值和微生物活性分析。观察到pH值在6.1至7.7的范围内。在植物根部附近和蟹类栖息地附近，微生物的活性较高。(3)热条件：秋季测量水温两周，冬季测量水温四周。结果表明，小溪的水温特征与湖泊、水库的水温特征相似，而与河流的水温特征不同。

项目成果

Hiromitu Hamaguchi: "Study on the Ecosystem and its thermal environment of the Creek in the downstream of Nagara-River" Proceedings of the Annual Conference of JSCE,Chubu-Division. 163-164 (1996)

Hiromitu Hamaguchi：“长良川下游溪流生态系统及其热环境研究”JSCE中部分会年会论文集。

中谷剛: "木曽川人工ワンドの環境調査" 岐阜大学工学部研究報告. 46. 1-8 (1996)

中谷刚：《木曾川人工魔杖的环境调查》岐阜大学工学部研究报告书46. 1-8 (1996)。

Tsuyoshi Nakatani: "ENVIRONMENTAL STUDY ON THE ARTIFICIAL CREEKS IN THE KISO-RIVER" RESEARCH REPORT OF THE FACULTY OF ENGINEERING GIFU UNIVERSITY. Vol.46. 1-8 (1996)

Tsuyoshi Nakatani：“木曾河人工溪流的环境研究”岐阜大学工学院的研究报告。

山下 剛紀: "入口ワンドの生態系に関する基礎的研究" 土木学会中部支部 平成6年度研究発表会講演概要集. 147-148 (1995)

Takanori Yamashita：“入口魔杖生态系统的基础研究”，日本土木工程师学会中部分会，1994 年研究报告摘要 147-148（1995 年）。

濱口 寛光: "長良川下流域自然ワンドの生態系とその熱環境に関する研究" 土木学会中部支部 平成7年度研究発表会講演概要集. (1996)

滨口宏光：“长良川下游的自然魔杖生态系统及其热环境研究”日本土木学会中部分会 1995 年研究报告演讲摘要（1996 年）。