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尼洋河流域洪水灾害成因分析 总被引:2,自引:0,他引:2
使用林芝站从1971~2000年30年降水量历史资料,简要分析尼洋河流域降水气候变化特点,并结合该流域实际受洪灾情况,对其成因等进行了分析,并提出了一些建议,以供相关部门参考。 相似文献
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For a channel-shoal system in a funnel-shaped basin the impact of dredging and dumping is investigated using a complex process-based
model. First, the residual flow and sediment transport circulations are analysed for the channel-shoal pattern, which has
emerged after a long-term model simulation. Results are compared to the Western Scheldt estuary, which forms the inspiration
for this study. Subsequently, different dredge and dump scenarios are modelled, according to a conceptual model, in which
ebb-and flood-channels and enclosed shoals form morphodynamic units (cells) with their own sediment circulation. Model results
show that dumping sediment in a channel further reduces the channel depth and induces erosion in the opposite channel, which
enhances tilting of the cross-section of the cell and eventually can lead to the degeneration of a multiple channel system
into a single channel. The impact of different dredging and dumping cases agrees with results from a stability analysis. This
means that this type of model applied to a realistic geometry can potentially be used for better prediction of the impact
of human interventions. 相似文献
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我研究黄河推荐“高效清淤船”已经七年,深感必须着眼长远,用发展的办法根治淤沙和悬河,才能达到可持续发展,同建设小康社会和不断发展的全面进步社会相适应。 相似文献
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文章论述了2005年6月10日至26日,回龙水库所在地广东省新丰县受到持续特大暴雨袭击,20日最大降雨量达284mm.暴雨造成水库库区内多处山体滑坡,并将上游部分村庄夷为平地,农田被毁,淤积达1~3m.大量的泥沙、树枝、编织物等杂物卷入水库,造成水库河床雍高,排水涵进水口被掩埋,淤积达8~10m,严重破坏了水库的使用功能,需马上进行库底清淤及排水涵疏通.针对此情况,结合北江大堤吹填砂的施工经验,采用改装绞吸式抽砂船清淤、高压水枪疏通排水涵的施工方案,通过实施,取得了较好的效果. 相似文献
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