STUDY ON THE EXCESSIVE GROWTH OF REVERINE TREES IN GRAVEL-BED RIVER
STUDY ON THE EXCESSIVE GROWTH OF REVERINE TREES IN GRAVEL-BED RIVER
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砾石河道中红叶树过度生长的研究
DOI：
10.2208/prohe.43.971
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发表时间：
1999
期刊：
影响因子：
--
通讯作者：
S. Okada
中科院分区：
文献类型：
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作者：
Y. Shimizu;S. Kobatake;Takayuki Arafune;S. Okada
近年来，砾石河床河道中的树木在沙洲和河漫滩上的覆盖面积大大增加和扩大。这种情况给河流管理带来了环境方面的问题，也给河流防洪安全带来了问题。要弄清这些问题，就必须了解砾石河床中的原生植被是如何生长和扩大其覆盖范围的。在本研究中，在渡濑河的上游河段进行了实地调查，该河段的平均河床比降约为1/150，具有1段河段的特征。调查结果表明，刺槐格罗夫斯林扩展到沙洲和河漫滩上，表层为细沙。该层由细砂（0.5mm-1.0mm）沉积而成，其来源可能来自主河道的底质。它是刺槐生长和林木扩展面积形成的重要因子。研究结果还提出了砾石床河流中逆向树木扩张形成的情景。
Recently reverine trees in the course of gravel bed-river have extremely increased and enlarged their covered-area over bars and flood plain. Such a situation brings about problems of river management for the environmental aspects as well as the safety of rivers against flood. In order to clarify such problems, we should get the knowledge about how the instream vegetation grow up and expand their covered zones in gravel-bed river. In this study, the field surveys were carried out in the upstream reach of the river Watarase which has the averaged bed slope of about 1/150 and has the characteristics of the segment-1 reach. The surveys suggest that the groves of Robinia pseudo-acacia expanded over bars and flood plains with the surface layer of the fine sand. This layer is formed-by the deposition of fine sand(0.5mm-1.0mm) and its resources might originate from bed materials in the main channel. It is significant factor for the growth of Robinia pseudo-acacia and the formation of trees expanded area. The results also propose a scenario of the formation of the reverine trees expansion in gravel-bed river.