Storm-runoff characteristics of the three small steep watersheds, upstream of the Tenryu river

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  • 天竜川上流域における急峻な3つの小流域の流出特性の違い
  • テンリュウガワ ジョウリュウイキ ニ オケル キュウシュン ナ 3ツ ノ ショ

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Abstract

Hydrological observations were conducted in the small (3.8-7.1ha) steep forested watersheds where three types of bedrocks are underlain (Paleozoic sedimentary rocks, Granite, Metamorphic rocks). A contrasting runoff response to rainfall was observed. In K1 watersheds (sedimentary rocks), runoff did not respond to each rainfall, occurring only at the high antecedent rainfall condition. Double peak hydrographs, having very low initial peak and high secondary peak, were observed. Contrary to this, in Y1 watershed (Granite), frequent runoff events with high discharge peak were observed, and the quick flow runoff ratio was proportional to the amount of rainfall. In O1 watershed (Metamorphic rocks), the runoff response is similar to Y1 watershed, but the quick flow runoff ratio was much smaller. From the above results, it is suggested that these differences were caused by different storm water flow paths due to different underlying geology.

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