Research progress on gully erosion measurement methods
HE Tao1,2, SHI Yangzi1,2, YANG Yang1,2, HUANG Tingting1,2, BAI Xue1,2, LIU Baoyuan2,3, LIU Yingna1
1. State Key Laboratory of Earth Surface Processes and Resources Ecology, Faculty of Geographical Science, Beijing Normal University, 100875, Beijing, China; 2. School of Geography, Faculty of Geographical Science, Beijing Normal University, 100875, Beijing, China; 3. State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, 712100, Yangling, Shaanxi, China
摘要通过Web of Science高级检索与人工筛选获取截至2019年的切沟侵蚀定量研究文献，总结主要切沟侵蚀测量方法的发展趋势和特点，比较各方法的优缺点。研究表明，切沟侵蚀测量方法可分为接触与非接触测量2大类，下分测针法等共8类，根据搭载平台可细分为14种方法，其中应用最多的是航空遥感解译法与卫星遥感解译法。各方法主要呈3种发展趋势：快速增加、先缓慢后快速增加、缓慢增加，分别以机载运动恢复结构（Structure from Motion，SfM）立体摄影测量法、卫星遥感解译法与机载激光扫描法为代表。利用精度等9个指标对各方法进行对比发现，不同方法的适用对象不同，断面测量法总体精度不高，但简易高效，可用于野外切沟快速调查；实时动态差分GPS精度高、速度快，是野外切沟测量的有效方法；SfM法相比传统摄影测量法优势明显；遥感解译法适合大尺度切沟时空分布特征研究。研究结果可为合理选择切沟侵蚀测量方法提供参考。
Abstract：[Background] Gullies are defined as the channels that are too deep to cross or to fill with normal tillage operations. Gully erosion, literally, is the soil detachment and transportation that occurs during the development of gullies, and serves as a major source of soil loss at the catchment scale. Accurate and suitable monitoring techniques are required in the quantitative study of gully erosion and therefore in the establishment and improvement of gully erosion models. During recent decades, more and more effort has been made to improve the previous monitoring methods as well as to develop new efficient methods. [Methods] The advanced searches provided by the Web of Science were applied to explore the major gully erosion measurement methods employed in the previous studies by the end of 2019. The application trends and characteristics of these methods were analyzed quantitatively, and the primary advantages and disadvantages of each method were discussed. [Results] The results manifest 2 classes of gully erosion monitoring methods, which are contact and non-contact methods. Therefore, the class of the contact method includes erosion pins, tape method, volume replacement method, total station and GPS; and the class of the non-contact method consists of laser scanning, stereo-photogrammetry and remote sensing. According to the supporting platform, these methods are further subdivided into 14 specific types, among which the aerial and satellite remote sensing have been so far applied most frequently. The corresponding publications account for 39.6% and 12.8%, respectively, of the total publications directly measuring gullies. Since 1980s, increasing attention has been paid to the quantitative research of gully erosion. Three typical trends in general are identified for the applications of the 14 gully measurement methods, which are rapid increase represented by the airborne structure from motion (SfM) stereo-photogrammetry, slow followed by fast increase represented by the satellite remote sensing, and slow increase represented by the airborne laser scanning. Different methods are applicable for different research objects and purposes. According to the 9 indices used for method evaluation, the tape method possesses rather low accuracy, but it is simple and efficient, and serves as a great tool for rapid gully survey in the field. The real-time kinematic (RTK) GPS is usually the optimal choice for field gully monitoring as it has a rather high accuracy but low time cost. The newly-developed SfM photogrammetry exhibits significant superiority over the traditional stereo-photogrammetry; whereas, the remote sensing is suitable for large-scale research on temporal and spatial distribution of gullies. [Conclusions] These findings hold important implications for selecting gully erosion measurement methods. To ensure the consistency and comparability of measurement results, standard procedures need to be established for each method in the future. It remains a challenge to integrate different techniques to realize the comprehensive gully erosion monitoring at multiple spatial and temporal scales.
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HE Tao, SHI Yangzi, YANG Yang, HUANG Tingting, BAI Xue, LIU Baoyuan, LIU Yingna. Research progress on gully erosion measurement methods. SSWC, 2021, 19(2): 151-158.
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2021, Vol. 19 
