筑坝拦截对黑河河道沉积物粒度空间分布的影响(4)
【作者】网站采编
【关键词】
【摘要】5 结论 本文对黑河沉积物粒度参数的空间分布规律进行了分析,探究了沉积物对该流域环境变化的响应,得到以下结论: 1)黑河干流上游宝瓶水库坝下游至
5 结论
本文对黑河沉积物粒度参数的空间分布规律进行了分析,探究了沉积物对该流域环境变化的响应,得到以下结论:
1)黑河干流上游宝瓶水库坝下游至莺落峡河段的平均粒径与上游支流野牛沟及干流中游相比差异显著,从大到小为:宝瓶水库坝下游至莺落峡河段(0.82 mm)>干流中游(0.25 mm)>上游支流野牛沟(0.18 mm),表明受梯级水库建设的影响,河流沉积物粒径在梯级水库建设河段较自然河段明显增大.
2)受水电梯级开发影响,黑河干流库区泥沙粒径较自然河段明显减小,分选很好,呈正偏或极正偏尖锐分布,而且在库区不同沉积高度上表现出分层沉积特征,即粒径较大的泥沙先行沉积,粒径较细的泥沙沉积在库区表层;坝下游河段较自然河段泥沙粒径粗化显著,分选变差,偏态趋向极正偏,峰态尖锐化;水库回水区受水库壅水及下泄清水的双重制约,泥沙粒度参数介于自然河段和坝下游河段之间,整体分选中等,呈极正偏尖锐分布.
3)沉积环境分析表明,黑河上游支流野牛沟河段沉积物粒度特征受泥沙供给和物源特征的影响较水动力条件显著,而干流河段沉积物粒度特征主要受河流水动力条件控制,其中库区的水动力条件小于水库回水区河段,坝下游河段的水动力条件强于自然河段.
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文章来源:《黑河学刊》 网址: http://www.hhxkzz.cn/qikandaodu/2020/0928/394.html
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