若尔盖盆地黑河的牛轭湖沿程变化与形态特征
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TV147

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水利部黄河泥沙重点实验室开放课题基金(2017005);黄河水利科学研究院院所长基金(HKY-JBYW-2016-03);湖南省研究生科研创新项目(CX2017B477)


Analysis on morphological features of oxbow lakes along Heihe River in Zoige Basin
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    摘要:

    基于SPOT(1990年和2000年)和Google Earth(2000—2014年)遥感影像的图像分析,对黑河干流及上游的3条支流(格曲、麦曲、哈曲)的216个典型牛轭湖以及相应的河曲带进行形态参数的定义与分析。沿黑河上游至下游,河曲带的宽度是增加的,增长率的变化趋势为“急—缓—急”;中游牛轭湖数量最多;下游受到泥沙淤积的影响更大,牛轭湖从Ω形发展成U形和C形所需时间远小于上中游。1990—2013年黑河干流仅发生2次裁弯,分别形成Ω形和U形牛轭湖,说明黑河牛轭湖的发育速率较慢。

    Abstract:

    Heihe River is a typical meandering river located in the Zoige Basin, which is an important tributary of the Yellow River source. Many oxbow lakes developed along Heihe River due to natural cutoffs, which record the cutoff frequencies and old channel morphologies. By processing the remote sensing images of SPOT(1990 and 2000)and Google Earth(2000-2014), 216 oxbow lakes in the mainstream and three tributaries(i. e. , Gequ, Maiqu, and Haqu Rivers)along the river channel were identified and the morphological parameters of the meander belts were further defined and analyzed. The results show that the width of the meander belt along the channel increases with a trend of “quick-slow-quick” and moreover most of the oxbow lakes developed in the middle reach. Due to the impact of sediment deposition in the lower reach, the formation time of Ω-shape oxbow lakes is much less than that of U-shape and C-shape oxbow lakes in the middle and upper reaches. Only two cutoffs occurred during 1990-2013 and a Ω-shape and U-shape oxbow lake gradually formed, indicating that the formation rate of oxbow lakes in the Zoige basin is slow.

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李想,李志威,胡旭跃,等.若尔盖盆地黑河的牛轭湖沿程变化与形态特征[J].水利水电科技进展,2017,37(6):19-24.(LI Xiang, LI Zhiwei, HU Xuyue, et al. Analysis on morphological features of oxbow lakes along Heihe River in Zoige Basin[J]. Advances in Science and Technology of Water Resources,2017,37(6):19-24.(in Chinese))

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  • 收稿日期:2016-12-07
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  • 在线发布日期: 2017-11-08
  • 出版日期: 2017-11-10