Current Continuity and Restoration of Process for Fish Habitat in Decreased Discharge

减少排放后鱼类栖息地过程的持续性和恢复

• 批准号: 13650576
• 负责人: WADA Kiyoshi
• 金额: $ 1.54万
• 依托单位: Gifu 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: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13650576/
• 关键词: fish habitat; current continuity; river restoration works; riffle and pool; fishway; estuary; Japanese mitten crab; megalopa larva; 魚類生息場評価; 河道の陸地化

River environment is characterized as dynamic properties in which cycles of destruction and restoration through fluctuations in discharge, and typical river environment is maintained and formed by fluctuations in discharge ranging from low water to high water. It is estimated that causes of the changes of habitats and thriving state of fauna and flora based on observed data in the Neo-River where includes a irrigative distribution problem. Also, how morphological structure on gravel bars is changing under influence of human disturbances is discussed by comparing the aerial photograph data for forty years. As a result, macro and micro morphology scale related to habitats and thriving state of fauna and flora are defined. It is occurred partially to flow discontinuity zone in the site using temperature data logging system. It is pointed out that flow discontinuity impacts through river ecological system.The "nature-oriented river works exhibition" has been constructed at downstream reach … More for three hundreds meters in the Shin-Sakai River branch of the Kiso River. The foot-protection works are using of natural materials and the porous concrete blocks, and the traditional nature-oriented method such as the well-stabilized riprap with wooden-framed-cobbles are constructed experimentally. This study has been conducted to investigate characteristics of fish habitats using by topographical survey, hydraulic measurement and fish trappings. As results of the field observation and estimation, it is pointed out as follows. The topography of upstream reach from the calvert is monotonous horizontal river line with a gently bottom slope. It is pointed out that fish habitat have diversified flow distributions caused by complicated topography and vegetation cover. The nektonic fishes inhabited mainly in the slope side section and preferred to riffle and pool, while the benthonic inhabited mainly in the paddy field section and were closely related with riparian plants, submerged plants.Settlement and upstream migration in the Japanese mitten crab (Eriocheir japonica) was investigated in the Seseragi-fishway in the Nagara estuary barrage. Megalopa larvae settled and metamorphosed to crab stage in the upper tidal zone in the Seseragi-fishway. Settlement of megalopa larvae occurred mainly in early summer (June) and early winter (December). Their upstream migration to the freshwater area began in July and August. The majority of larvae that settled in winter did not survive and metamorphose to the crab stage due to low water temperatures. Thus, the growth and upstream migration of the Japanese mitten crab seemed to be strongly influenced by water temperature in the estuary. This mode of settlement with two peaks in summer and early winter reflected the temporal pattern of reproduction observed in the sea. In this study, it is clarified that the Seseragi-fishway have a function of settlement and upstream migration for supplement of decreased estuary zone. Less

河流环境是一种通过流量波动而进行破坏和恢复的动态特性，典型的河流环境是由流量从枯水到丰水的波动维持和形成的。根据观测资料，估计了包括灌溉分布问题在内的新河生境变化和动植物植物群繁盛状态的原因。并通过40年航片资料的对比分析，探讨了人为干扰对砂坝形态结构的影响。从而定义了与生境和动植物植物群繁盛状态相关的宏观和微观形态尺度。利用温度数据记录系统，在现场局部出现了流动间断区。指出了水流不连续性对河流生态系统的影响，并在下游建设了“以自然为导向的河流作品展 ...更多信息 在木曾川的新坂井川分支，护坡工程采用天然材料和多孔混凝土砌块，并对传统的以自然为导向的木构碎石护坡方法进行了试验研究。本研究利用地形测量、水力测量及渔获物收集等方法，探讨鱼类栖息地之特性。根据现场观测和估算的结果，指出：河道上游地形为单调的水平河线，底坡平缓。指出鱼类栖息地复杂的地形和植被覆盖导致了水流分布的多样性。在长良河口拦河闸Seseragi-fishway中，对日本绒螯蟹（Eriocheir japonica）的定居和上游洄游进行了研究。大眼幼体在Seseragi-fishway的高潮带定居并变态为蟹阶段。大眼幼体的定居主要发生在初夏（6月）和初冬（12月）。它们在7月和8月开始向上游淡水地区迁徙。由于水温较低，大多数在冬季定居的幼虫没有存活下来，并变质到螃蟹阶段。因此，生长和上游迁移的日本绒螯蟹在河口的水温似乎有很大的影响。这种在夏季和初冬出现两个高峰的定居模式反映了在海洋中观察到的繁殖时间模式。在本研究中，阐明了Seseragi-fishway具有沉降和上游迁移的功能，以补充减少的河口区。少

项目成果

K. WADA and Y. Morita: "Characteristics of Fish Habitat and Function of Vegitative Covered Revetment on River Enhancement Works"Advances in River Engineering. Vol. 9. 164-169 (2003)

K. WADA 和 Y. Morita：“鱼类栖息地特征和植被护岸对河流加固工程的作用”河流工程进展。

和田 清, 今村和志: "河川環境に配慮した舟通し魚道の機能"Journal of Eco-technology Research(エコテクノロジー研究),第8回エコテクノロジーに関するアジア国際会議シンポジウム. Vol.7,No.2. 236-237 (2001)

Kiyoshi Wada，Kazushi Imamura：“考虑河流环境的船穿式鱼梯的功能”，《生态技术研究杂志》，第八届亚洲国际生态技术研讨会，第 7 卷，第 236 -237 期（2001 年）。

K. WADA, N.Koizumi and K. Imamura: "Settlement and Upstream Migration for Japanese Mitten Crab and Function of Seseragi-Fishway in Nagara Estuary Barrage"Advances in River Engineering. Vol. 9. 145-151 (2003)

K. WADA、N.Koizumi 和 K. Imamura：“日本绒螯蟹的定居和上游洄游以及长良河口拦河坝 Seseragi 鱼道的功能”河流工程进展。

和田 清, 水谷 法美: "台風期における人工リーフ背後の海浜変形の素過程"土木学会海洋開発論文集. 第18巻. 479-484 (2002)

Kiyoshi Wada、Norimi Mizutani：“台风季节人工鱼礁后面海滩变形的基本过程”日本土木工程师学会海洋开发会议记录，第 18 卷，479-484（2002 年）。

和田 清, 森田 陽介, 橋本 勇: "新境川における多自然型工法の護岸機能と魚類生息場に関する一考察"土木学会河川技術論文集. 第9巻. 164-169 (2003)

Kiyoshi Wada、Yosuke Morita、Isamu Hashimoto：“新境河多自然建造方法的护岸功能和鱼类栖息地的研究”《河流技术杂志》，日本土木工程学会，第 9 卷，164-169。 (2003)