Preliminary Study on Natural Erosion Rates in Small Watershed of Sichuan Hilly Basin

ZHANG Xin-bao; WEN An-bang; ZHANG Yun-qi; WANG Yang-chun; QI Yong-qing; He Xiu-bin

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Preliminary Study on Natural Erosion Rates in Small Watershed of Sichuan Hilly Basin

更新时间：2024-11-07

- Preliminary Study on Natural Erosion Rates in Small Watershed of Sichuan Hilly Basin
- Vol. 20, Issue 1, Pages: 1-5(2006)
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  CLC： S157.1
- Published：2006
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ZHANG Xin-bao, WEN An-bang, ZHANG Yun-qi, et al. Preliminary Study on Natural Erosion Rates in Small Watershed of Sichuan Hilly Basin[J]. 2006, 20(1): 1-5.
DOI：

ZHANG Xin-bao, WEN An-bang, ZHANG Yun-qi, et al. Preliminary Study on Natural Erosion Rates in Small Watershed of Sichuan Hilly Basin[J]. 2006, 20(1): 1-5. DOI：

摘要

长江三峡中更新世的贯通

导致川中丘陵区河流的急剧下切

两岸广袤的平原被沟谷肢解为起伏的丘陵

现今孤立的丘顶是河流下切前的平原面

沟谷的盆腔体积表征了急剧下切以来的侵蚀量。我们选择内江附近的小河沟流域为研究小流域

采用DEM法测算了沟谷的盆腔体积

并根据阶地绝对年龄

计算了流域的自然侵蚀速率;还估算了流域内的松散堆积物体积

计算了流域的自然泥沙输移比。小河沟流域集水面积10.88 km2

侵蚀沟谷盆腔体积6.57亿m3。IV级高平原阶地和Ⅲ级阶地砂砾层的绝对年龄分别以0.7M a和0.4M a计

相应的自然侵蚀模数分别为216 t/(km2.a)和378/(km2.a)

和沱江川中丘陵区区间的现代输沙模数397 t/(km2.a)非常接近。流域内松散堆积物总体积不超过200万m3

流域的自然泥沙输移比为0.997

接近于1。

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