PDF Download

[1]FENG Juanlong,WU Chuandong,YU Yang,et al.Effects of Extreme Rainfall on Sediment Connectivity in a Farmland Watershed of the Gully Region in the Western Shanxi Province of the Loess Plateau[J].Research of Soil and Water Conservation,2023,30(04):228-235.[doi:10.13869/j.cnki.rswc.2023.04.039.]

Copy

Effects of Extreme Rainfall on Sediment Connectivity in a Farmland Watershed of the Gully Region in the Western Shanxi Province of the Loess Plateau

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 30 Number of periods: 2023 04 Page number: 228-235 Column: Public date: 2023-06-10

Title:: Effects of Extreme Rainfall on Sediment Connectivity in a Farmland Watershed of the Gully Region in the Western Shanxi Province of the Loess Plateau

Author(s):: FENG Juanlong¹, WU Chuandong³, YU Yang^1,2, LIU Hu³, WANG Baiqun⁴, WEI Baojing⁵, ZHAO Jiongchang¹; (1.School of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China; 2.Jixian National Forest Ecosystem Observation and Research Station, CNERN, School of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China; 3.Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences/Linze Inland River Basin Research Station, Chinese Ecosystem Research Network, Lanzhou, Gansu 730000, China; 4.State Key Laboratory of Soil......)

Keywords:: extreme precipitation; check dam; sediment connectivity; integrated watershed management

CLC:: S157.1

DOI:: 10.13869/j.cnki.rswc.2023.04.039.

Abstract:: [Objective] The aims of this study focus on the influence of extreme rainfall events on sediment connectivity of slope-gully system in small watershed, and further provide theoretical basis for comprehensive watershed management. [Methods] The farmland watershed in Caijiachuan watershed in Ji County of the Loess Plateau was taken as the research area. UAV and remote sensing images were used to carry out aerial survey and field survey on slope and gully system before and after the extreme rainfall event in Shanxi in October 2021. The landscape pattern changes before and after extreme rainstorm were analyzed, the sediment connectivity of slope-gully system was quantified, and the spatial distribution and topographic features of landslide points were identified, the responses of typical engineering measures to extreme rainfall were evaluated. [Results] The rainfall event lasted for 84 hours, with a cumulative rainfall of 160.4 mm, a rainfall intensity of 1.9 mm/h and a rainfall frequency of 0.16%. It was an extreme rainstorm that occurred once in a hundred years. After the rainstorm, the number of patches increased, the landscape shape index increased, the Contag index decreased, and the Shannon diversity index decreased. Sediment connectivity unevenly distributed in the watershed before the rainstorm, but it increased after the rainstorm. After the rainstorm, the sediment connectivity of landslide site decreased, and the landslide mainly occurred on the slopes with 0°～10° and 40°～50°, accounting for 29.11% and 17.74%, respectively. [Conclusion] Landslides induced by extreme rainfall events affect sediment connectivity, and the sediment connectivity index can be used to identify landslides sites thus can be used to assess the response of typical soil and water conservation engineering measures to extreme rainfall. The results of this study can provide support for integrated watershed management and ecological restoration after extreme precipitation events.

References:: [1] 曾茂林,朱小勇,康玲玲,等.水土流失区淤地坝的拦泥减蚀作用及发展前景[J].水土保持研究,1999,6(2):127-134.
[2] 朱显谟.再论黄土高原国土整治“28字方略”[J].科技导报,1996(03):44-48.
[3] 袁水龙,张卫华,王湛.黄土丘陵区小流域淤地坝系安全评价体系研究[J].西部大开发(土地开发工程研究),2018,3(5):40-45,50.
[4] 杭朋磊.黄土高原淤地坝系洪灾溃决风险评价[D].西安:西安理工大学,2020.
[5] 王彬.极端降雨敲响气候变化警钟[J].科学新闻,2021,23(4):47-49.
[6] 于洋,刘尧,华廷,等.基于文献计量的水文连通性研究热点与趋势[J].水资源与水工程学报,2021,32(02):1-9.
[7] Thompson C J, Fryirs K, Croke J. The disconnected sediment conveyor belt: patterns of longitudinal and lateral erosion and deposition during a catastrophic flood in the Lockyer Valley, South East Queensland, Australia [J]. River Research and Applications, 2016,32(4):540-551.
[8] Marchi L, Comiti F, Crema S, et al. Channel control works and sediment connectivity in the European Alps [J]. Science of the Total Environment, 2019,668:389-399.
[9] 支再兴.淤地坝对沟道水流的调控作用研究[D]. 西安:西安理工大学,2018.
[10] 赵宇辉,张建军,于洋,等.晋西黄土区蔡家川小流域切沟的空间分布及形态特征[J].农业工程学报,2022,38(4):151-158.
[11] Borselli L, Cassi P, Torri D. Prolegomena to sediment and flow connectivity in the landscape:A GIS and field numerical assessment [J]. Catena, 2008,75(3):268-277.
[12] Cavalli M, Trevisani S, Comiti F, et al. Geomorphometric assessment of spatial sediment connectivity in small Alpine catchments [J]. Geomorphology, 2013,188:31-41.
[13] Shi P, Zhang Y, Ren Z P, et al. Land-use changes and check dams reducing runoff and sediment yield on the Loess Plateau of China [J]. Science of the Total Environment, 2019,664:984-994.
[14] Alfonso-Torreño A, Schnabel S, Gómez-Gutiérrez Á, et al. Effects of gully control measures on sediment yield and connectivity in wooded rangelands [J]. Catena, 2022,214:106259.
[15] 卫伟,陈利顶,傅伯杰,等.黄土丘陵沟壑区极端降雨事件及其对径流泥沙的影响[J].干旱区地理,2007,116(06):896-901.
[16] 魏霞,李勋贵,李占斌.黄土高原坡沟系统径流泥沙过程[J].兰州大学学报:自然科学版,2010,46(5):7-10,18.
[17] 张意奉,焦菊英,唐柄哲,等.特大暴雨条件下小流域沟道的泥沙连通性及其影响因素:以陕西省子洲县为例[J].水土保持通报,2019,39(1):302-309.
[18] 唐柄哲.黄土丘陵沟壑区坡沟系统侵蚀产沙特征及泥沙连通性研究[D].陕西杨凌:西北农林科技大学,2021.
[19] 胡胜,邱海军,王宁练,等.地形对黄土高原滑坡的影响[J].地理学报,2021,76(11):2697-2709.
[20] Fang H Y. Effect of soil conservation measures and slope on runoff, soil, TN, and TP losses from cultivated lands in northern China [J]. Ecological Indicators, 2021,126:107677.
[21] Caviedes-Voullième D, Ahmadinia E, Hinz C. Interactions of microtopography, slope and infiltration cause complex rainfall-runoff behavior at the hillslope scale for single rainfall events [J]. Water Resources Research, 2021,57(7):1-20.
[22] Duvert C, Gratiot N, Anguiano-Valencia R, et al. Baseflow control on sediment flux connectivity: Insights from a nested catchment study in Central Mexico [J]. Catena, 2011,87(1):129-140.
[23] 许阳光,郭文召,王文龙,等.极端降雨下黄土高原草被沟坡浅层滑坡特征及其对产流产沙的影响[J].生态学报,2022,42(19):7898-7909.
[24] Bogunovic I, Pereira P, Kisic I, et al. Tillage management impacts on soil compaction, erosion and crop yield in Stagnosols(Croatia)[J]. Catena, 2018,160:376-384.
[25] 李阳,张建军,魏广阔,等.晋西黄土区极端降雨后浅层滑坡调查及影响因素分析[J].水土保持学报,2022,36(5):44-50.
[26] Paik K, Kim W. Simulating the evolution of the topography-climate coupled system[J]. Hydrology and Earth System Sciences, 2021,25(5):2459-2474.
[27] 宁怡楠.黄土高原典型小流域水文连通性变化及其与径流泥沙量的响应关系[D].北京:中国科学院大学(中国科学院教育部水土保持与生态环境研究中心),2021.
[28] Bracken L J, Turnbull L, Wainwright J, et al. Sediment connectivity:a framework for understanding sediment transfer at multiple scales [J]. Earth Surface Processes and Landforms, 2015,40(2):177-188.

Similar References:

Memo

Last Update: 2023-06-10