小貝川破堤(1981年8月)による浸水流の挙動について

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タイトル別名
  • BEHAVIOR OF THE INUNDATION WATER BY THE COLLAPSE OF THE LEFT BANK OF THE RIVER KOKAI IN AUGUST, 1981
  • コカイガワ ハテイ 1981ネン 8ガツ ニヨル シンスイリュウ ノ キョドウ

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説明

The left bank of the River Kokai was collapsed by the flood water of the River Tone caused by a storm of Typhoon 8115 at Ryugasaki City, Ibaraki Prefecture, at about 02:12 a. m. on August 24, 1981. The collapsed point was the place about 4.5 km upper from the junction to the River Tone, where a meandering segment was shortly cut in 1925.<br> Typhoon 8115 produced a heavy storm over 300 mm in the mountainous region of the uppermost basins of the River Tone for 3 days from August 21 to 23 (Fig. 1). More thai one days after the peak of precipitation, the collapse of the bank of the River Kokai occur-r ed. The inundation area was about 3, 300 ha as shown in Fig. 2.<br> The authors measured a maximum depth of the inundation water at 165 elevation spots in the inundation area (Fig. 5). Judging from its result and aerial photos taken about 7 hours after the collapse of the bank, the authors found the following facts on the behavior of the inundation water.<br> 1. The inundation water had three main flows as seen in Figs. 3 and 4. Among them, the strongest one flowed southward.<br> 2. The inundation water advanced straightforwardly under little control of a relief of ground surface when the inundation water flowed strongly. As leaving from the center of the main flow or weakening of the strength of the flow, the inundation water was controlled by a relief of ground surface (Figs. 6 and 7).<br> 3. The Ronsho Drainage drained much inundation water, but it was not a main route forr the inundation water flow.<br> 4. The spread of the inundation area was significantly influenced by the existence of the inner bank constructed in the Edo era.<br> 5. It is very. important for our present society to digest and apply a traditional land use and counterplan for disaster prevention from all kinds of materials such as archives.

収録刊行物

  • 地理学評論

    地理学評論 56 (11), 769-779, 1983

    公益社団法人 日本地理学会

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