明石川の魚類生息環境評価に関する研究

概要

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Recently, because river improvement by the Neo-Natural River Reconstruction Method is tried in various regions of Japan, Japanese the society has demanded the evaluation of how the developed technology influences the river environment. In this research, fishes' habitat environments were evaluated by fish habitat research and a physical environmental simulation model on the Akashi river. Many weirs were constructed in the Akashi river for agricultural irrigation and drinking water. Therefore, the stream flow is lessened. Most fish found in the Akashi river were fishes of the Cyprinus carpio family that showed a strong tolerance in water pollution. Benthic animals did not exist because the soil particles and suspended solid accumulate in the riverbed. The Zacco platypus and the Rhinogobius flumineus have a habitat presence of only 7.7% and 5.8% of the investigatied area in the present stream flow (0.2m3/s) in situation one. It is necessary to adjust the stream flow to about 1.0m3/s to enhance the value of the habitat persence to twice.
明石工業高等専門学校の論文