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特大暴雨下不同土地利用类型坡面切沟发育特征

陈卓鑫, 王文龙, 康宏亮, 杨波, 赵满, 王文鑫

陈卓鑫, 王文龙, 康宏亮, 杨波, 赵满, 王文鑫. 特大暴雨下不同土地利用类型坡面切沟发育特征[J]. 农业工程学报, 2020, 36(23): 77-84. DOI: 10.11975/j.issn.1002-6819.2020.23.009
引用本文: 陈卓鑫, 王文龙, 康宏亮, 杨波, 赵满, 王文鑫. 特大暴雨下不同土地利用类型坡面切沟发育特征[J]. 农业工程学报, 2020, 36(23): 77-84. DOI: 10.11975/j.issn.1002-6819.2020.23.009
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Chen Zhuoxin, Wang Wenlong, Kang Hongliang, Yang Bo, Zhao Man, Wang Wenxin. Gully development characteristics of the slopes for different land-use types under extreme rainstorms[J]. Transactions of the Chinese Society of Agricultural Engineering, 2020, 36(23): 77-84. DOI: 10.11975/j.issn.1002-6819.2020.23.009
Citation: Chen Zhuoxin, Wang Wenlong, Kang Hongliang, Yang Bo, Zhao Man, Wang Wenxin. Gully development characteristics of the slopes for different land-use types under extreme rainstorms[J]. Transactions of the Chinese Society of Agricultural Engineering, 2020, 36(23): 77-84. DOI: 10.11975/j.issn.1002-6819.2020.23.009
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特大暴雨下不同土地利用类型坡面切沟发育特征

  • 1.

    西北农林科技大学水土保持研究所黄土高原土壤侵蚀与旱地农业国家重点实验室，杨凌 712100

  • 2.

    中国科学院水利部水土保持研究所，杨凌 712100

  • 3.

    黄河勘测规划设计研究院有限公司，郑州 450003

  • 4.

    中国电建集团华东勘测设计研究院有限公司，杭州 310000

基金项目: 国家自然科学基金面上项目（41571275）；水利部"726"特大暴雨水土流失调查项目

Gully development characteristics of the slopes for different land-use types under extreme rainstorms

  • 1.

    State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Institute of Soil and Water Conservation, Northwest A&F University, Yangling 712100, China

  • 2.

    Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling 712100, China

  • 3.

    Yellow River Engineering Consulting Co., Ltd, Zhengzhou 450003, China

  • 4.

    Power China Huadong Engineering Corporation Limited, Hangzhou 310000, China

摘要

    摘要
  • 摘要: 切沟侵蚀是黄土高原丘陵沟壑区水土流失的重要形式之一，然而极端暴雨条件下不同土地利用类型坡面切沟侵蚀研究还鲜见报道。该研究以陕北2017年"7·26"特大暴雨为例，研究了岔巴沟流域3种土地利用类型（农地、休闲地和撂荒地）坡面切沟发育形态特征及体积估算模型。结果表明：1）农地、休闲地和撂荒地切沟长度分布在20 m内的占比分别为55.6%、34.8%和44.8%；农地切沟平均深度为110 cm，分别比休闲地和撂荒地高18.3%、19.2%；农地和休闲地切沟平均宽深比分别为0.87和0.84，横断面呈"宽-浅型"，而撂荒地切沟呈"方型"（宽深比1.01）。2）撂荒地切沟侵蚀体积分别比农地和休闲地减少47.8%和28.3%，表明植被恢复有效地削弱了极端暴雨作用下的切沟侵蚀。3）农地切沟不同坡段侵蚀体积由高到低为下坡、上坡、中坡，而休闲地和撂荒地切沟侵蚀体积沿坡长方向呈递增趋势；3种土地利用类型切沟在上坡段的沟岸拓宽速率大于下切速率，中下坡则相反。4）农地、休闲地和撂荒地切沟侵蚀体积均与切沟长度、横断面面积呈极显著幂函数关系（P<0.001），横断面面积是切沟体积估算更为有效的参数。研究结果可为黄土高原丘陵沟壑区不同土地利用类型坡面切沟侵蚀体积估算及其防治提供重要依据。
    Abstract: Gully erosion has been considered as one of the main forms of soil erosion on the Loess Plateau of China. To control soil and water loss and improve the eco-environmental quality of the Loess Plateau, the Chinese government implemented the "Grain for Green" project in 1999 to restore vegetation on steep slope farmlands. Although the project has been implemented for two decades, soil erosion on the loess hilly region caused by extreme rainstorms is still serious. Therefore, the controlled effects of vegetation restoration on gully formation and soil erosion on loess hillslopes under extreme rainstorms need to be evaluated. Moreover, the effect of land use change on the morphology of gullies and gully volume estimation under extreme rainstorms is poorly understood. Given these issues, the Chabagou watershed (a typical watershed in the Loess Plateau of China) suffered by an rainstorm (called "7·26" rainstorm) was selected as the study area of gully erosion. Four small basins in the Chabagou watershed were selected from the upper, middle, and lower reaches, respectively, to explore the morphological characteristics and derive volume estimation models of three land uses (farmland, fallow land, and abandoned land) under extreme rainstorm. A total of 140 gullies were investigated, including 45 gullies on farmland, 66 gullies on fallow land and 29 gullies on abandoned land. The gully length was measured by the laser rangefinder and the gully was divided into three sections (upper, middle and lower) by a 50-m tape. In each section, the top width, bottom width and the depth of the gully were measured using a steel tape. The measuring times was adjusted according to the gully length to ensure the measuring accuracy. The measured cross-sectional parameters (i.e. width and depth) of the three sections were averaged as the eventual width and depth of each section, and the gully volumes of the three sections were summarized to be the amount of gully erosion. The results showed that: 1) the gullies less than 20 m on farmland, fallow land and abandoned land accounted for 55.6%, 34.8% and 44.8%, respectively. The averaged gully depth on farmland was 110 cm, which was 18.3%, and 19.2% higher than those on fallow land and abandoned land, respectively. The width-depth ratios of gully on farmland and fallow land were 0.87 and 0.84, respectively, and their cross sections were characterized by the wide and shallow shape, but the crossed section of the gully on abandoned land was closed to squared shape (width-depth ratio was 1.01). 2) The lowest gully erosion volume was found on abandoned land, which was 47.8% and 28.3% lower than that of farmland and fallow land, respectively, indicating that vegetation restoration can effectively contain gully erosion under extreme rain. 3) Gully erosion volume of farmland on upslope was largest, followed by downslope and mid-lope, while fallow land and abandoned land showed an increasing trend along the slope. For the three types of land use, the widening rate of gully on the upslope was greater than that on the downslope, but the opposite was found on the mid-slope. 4) The significant (P<0.001) power functions could express the relationships between gully erosion volume and gully length and/or gully cross-sectional area on farmland, fallow land, and abandoned land, and the cross-sectional area was a more effective parameter for estimating gully volume. This study results can provide important information for predicting the gully erosion of different land use types and controlling gully erosion in the hilly area of the Loess Plateau.
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  • 收稿日期:  2020-07-26
  • 修回日期:  2020-11-09
  • 发布日期:  2020-11-30

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