IMPACTS OF DAM-INDUCED HYDROLOGIC ALTERATION ON RIVERINE ECOSYSTEM IN THE MIMI RIVER
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- SHIRASAKA Koudai
- 宮崎大学 工学研究科
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- NUKAZAWA Kei
- 宮崎大学 工学部社会環境システム工学科
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- SUZUKI Yoshihiro
- 宮崎大学 工学部社会環境システム工学科
Bibliographic Information
- Other Title
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- 宮崎県耳川における発電用ダムによる流況改変が河川生態系へ与える影響
- ミヤザキケン ジガワ ニ オケル ハツデンヨウ ダム ニ ヨル リュウキョウ カイヘン ガ カセン セイタイケイ エ アタエル エイキョウ
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Abstract
Dam reservoirs are well known to greatly alter the downstream environments. However, few studies have explored effects of dam-induced flow alterations on stream ecosystems to date. Here this study investigated a river that harbors multiple hydropower dams to understand the impacts of hydrologic alteration on stream organisms (fishes, invertebrates, algae). We computed the Indicators of Hydrologic Alteration using the dam outflow discharge data and performed the principal component analysis. As a result, the first principal component was explained by extent of discharge and variation in flow regime (= 56.2%), and clearly distinguished the studied sites in the fully regulated river sections from the moderately regulated site. The first principal component displayed significant (P < 0.05) negative correlation with the fish individual number (r = -0.502), and positive correlation with the fish species diversity (r = 0.706). Hence, it is suggested that the partial riverine organisms may be affected by different extent of flow alteration by the hydropower dams.
Journal
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- Journal of Japan Society of Civil Engineers, Ser. G (Environmental Research)
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Journal of Japan Society of Civil Engineers, Ser. G (Environmental Research) 74 (5), I_139-I_146, 2018
Japan Society of Civil Engineers