Contrast in hillslope and channel response to large storms in Redwood Creek, California, USA
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Accession number;04A0714049
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| Title;Contrast in hillslope and channel response to large storms in Redwood Creek, California, USA |
| Author;
MADEJ M A
(U.s. Geological Survey Western Ecological Res. Center, California, Usa)
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Journal Title;Suikei Kozo to Ryuiki Dotai ni Motozuku Mizu, Dosha Ryushutsu Kiko to Saigai Kankyo ni kansuru Kenkyu Heisei 12-15 Nendo No.12306008
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Journal Code:N20041657
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ISSN:
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VOL.;NO.;PAGE.158-160(2004)
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| Figure&Table&Reference;FIG.5, TBL.1, REF.9 |
| Pub. Country;Japan |
| Language;English |
| Abstract;The aspects of erosions of the hillslopes at the time of heavy rains in 1964 and 1997 were greatly different from each other.The scale of the heavy rain in 1964 was slightly larger than that in 1997, and since it continued for a longer time, the landslide volume became larger on one more order of magnitude.It seems that the large-scale landslide in 1964 was caused not only simply by the rainfall, but also probably by the widespread timber harvest as well as the road construction performed in those days. Most of the landslides of 1997 were enlargement of the collapse, or the movement returning to the original situation, where the unstable strata due to the previous landslides had already slipped down.Though the landslide volume in 1997 was much less than that in 1964, it was still 45% of all the sediments in Redwood Creek.In the upper watershed, the flattening action by sediments in a wide range became evident by the rapid incision and the enlargement of the river bed gravels due to the heavy rain in 1964, and following this, the stabilization by sediments of the stuffing in the interval by the revegetation was observed.In contrast with this, in the lower watershed the flattening and the non-flattening can be clearly observed here and there.The flood sediments in the lower watershed are being still actively eroded. |
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