| 基于遥感影像研究极端暴雨条件下新成切沟发生发展规律 |
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| 引用本文： | 杨丽娟, 王春梅, 张春妹, 庞国伟, 龙永清, 王雷, 刘宝元, 杨勤科. 基于遥感影像研究极端暴雨条件下新成切沟发生发展规律[J]. 农业工程学报, 2022, 38(6): 96-104. DOI: 10.11975/j.issn.1002-6819.2022.06.011 |
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| 作者姓名： | 杨丽娟 王春梅 张春妹 庞国伟 龙永清 王雷 刘宝元 杨勤科 |
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| 作者单位： | 1.西北大学城市与环境学院，西安 710127;2.旱区生态水文与灾害防治国家林业和草原局重点实验室，西安 710048;3.黄土高原土壤侵蚀与旱地农业国家重点实验室，杨凌 712100;4.北京师范大学自然科学高等研究院，珠海 519087 |
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| 基金项目： | 国家自然科学基金项目（41977062、41601290）;国家重点实验室基金（A314021402-2016）;陕西省重点科技创新团队项目（2014KCT-27） |
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| 摘 要： | 土壤侵蚀严重破坏土地资源，是全球性的环境问题，切沟侵蚀是土壤侵蚀的重要表现形式，近年来极端暴雨频发加剧了切沟侵蚀的发生和发展。为了研究气候变化条件下新成切沟的形成与发育规律，该研究以陕北子洲岔巴沟流域王武沟小流域为研究区，基于无人机航摄影像，以2017年陕北
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| 关 键 词： | 遥感 无人机 地形 黄土高原 极端暴雨 切沟 |
| 收稿时间： | 2021-12-18 |
| 修稿时间： | 2022-02-02 |
Occurrence and development of newly formed gullies under extreme rainstorm conditions using remote sensing images |
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| Yang Lijuan, Wang Chunmei, Zhang Chunmei, Pang Guowei, Long Yongqing, Wang Lei, Liu Baoyuan, Yang Qinke. Occurrence and development of newly formed gullies under extreme rainstorm conditions using remote sensing images[J]. Transactions of the Chinese Society of Agricultural Engineering (Transactions of the CSAE), 2022, 38(6): 96-104. DOI: 10.11975/j.issn.1002-6819.2022.06.011 |
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| Authors: | Yang Lijuan Wang Chunmei Zhang Chunmei Pang Guowei Long Yongqing Wang Lei Liu Baoyuan Yang Qinke |
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| Affiliation: | 1.College of Urban and Environmental Sciences, Northwest University, Xi'an 710127, China;2.Key Laboratory of Ecohydrology and Disaster Prevention in Arid Regions, National Forestry and Grassland Administration, Xi'an 710048, China;3.State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Yangling 712100, China;4.Advanced Institute of Natural Science, Beijing Normal University, Zhuhai 519087, China |
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| Abstract: | Abstract: Soil erosion has posed some serious damage on the land resources in the world. The "Grain for Green" project in 1999 has been launched to restore the vegetation on the steep slope farmlands and control the soil and water loss for a better ecological environment of the Loess Plateau in China. But, the frequent extreme rainstorms have aggravated the occurrence and development of gully erosion under global warming in recent years. The development of the gullies after the extreme rainstorm still remains unclear so far. Fortunately, the Unmanned Aerial Vehicle (UAV) data can be collected fast, accurately, and efficiently after a rainstorm. The flexible acquisition time of UAVs can be expected to serve as an effective tool for the development of gully. Taking the Wangwugou Small Watershed of Chabagou Watershed on the Loess Plateau as the research area, this study aims to investigate the formation and development of gully under a rainstorm using UAV images. A case study selected the "7·26" extreme rainfall that occurred in Northern Shaanxi of China on July 26, 2017, with a daily rainfall of 206.6 mm. The patterns of newly formed gullies were captured under the climate. An equation with the topographic parameters was established for the occurrence and development of newly formed gullies in the following three years. The results showed that: 1) There were 45 newly formed gullies during the extreme rainstorm, which were about 101 gully/km2 in total. Four types were divided, including the hill slope, terraced field, unpaved roadway, and bottom gullies. There were more gullies found on the slopping hills. The bottom and terraced field gullies presented much wider and larger in the study area. The unpaved roads, check dam farmland, and sloping farmland were more prone to the gullies. 2) In the three years after the formation of the new gullies, the development of the new gully heads was faster than that of the original, 34.48% of which were further advanced, indicating 1.32 times the original. The average gully head retreat rate of newly formed gullies was three times that of the original, up to 0.58 m/a, where the maximum speed reached 2.12 m/a. 3) The drainage area significantly promoted the development of gully heads. A critical topographic index was selected to simulate the retreat rate of gully heads. There was more severe soil erosion under extreme rainfall conditions. The source of newly formed gullies was rapidly traced within three years after the occurrence. Therefore, the appropriate management can be attached to prevent such gullies during this time. This finding can provide an essential reference to estimate the rill erosion on the different types of sloping land in the hilly area of Loess Plateau. |
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| Keywords: | remote sensing Unmanned Aerial Vehicle (UAV) topography Loess Plateau extreme rainstorm gully |
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