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    李辉丹, 曹帮俊, 赵鹏, 罗歆, 张云奇. 基于不同模型的三峡库区降雨侵蚀力时空变化分析[J]. 应用基础与工程科学学报, 2024, 32(5): 1265-1281. DOI: 10.16058/j.issn.1005-0930.2024.05.005
    引用本文: 李辉丹, 曹帮俊, 赵鹏, 罗歆, 张云奇. 基于不同模型的三峡库区降雨侵蚀力时空变化分析[J]. 应用基础与工程科学学报, 2024, 32(5): 1265-1281. DOI: 10.16058/j.issn.1005-0930.2024.05.005
    LI Huidan, CAO Bangjun, ZHAO Peng, LUO Xin, ZHANG Yunqi. Spatial-temporal Variation of Rainfall Erosivity in the Three Gorges Reservoir Area Based on Different Models[J]. Journal of Basic Science and Engineering, 2024, 32(5): 1265-1281. DOI: 10.16058/j.issn.1005-0930.2024.05.005
    Citation: LI Huidan, CAO Bangjun, ZHAO Peng, LUO Xin, ZHANG Yunqi. Spatial-temporal Variation of Rainfall Erosivity in the Three Gorges Reservoir Area Based on Different Models[J]. Journal of Basic Science and Engineering, 2024, 32(5): 1265-1281. DOI: 10.16058/j.issn.1005-0930.2024.05.005

    基于不同模型的三峡库区降雨侵蚀力时空变化分析

    Spatial-temporal Variation of Rainfall Erosivity in the Three Gorges Reservoir Area Based on Different Models

    • 摘要: 降雨侵蚀力是土壤侵蚀预报模型的重要参数和估算水土流失的关键因素.以三峡库区重庆段为研究区域,基于1972~2018年逐日降雨数据,采用Mann-Kendall检验法、线性相关分析、Morlet小波分析和地理信息技术等优选适宜三峡库区的简易模型研究降雨侵蚀力时空演变特征和影响因素.模型Ⅲ(谢云等开发的日降雨侵蚀力计算模型)在三峡库区有较好的适宜性,其有效系数最高(0.76以上)且相对偏差系数较低(仅0.23左右).多年平均降雨侵蚀力为4 480.29MJ·mm/(hm2·h),水土保持工作重点区域依次为开州、万州和云阳等区县.降雨侵蚀力年际变化主周期为28a,在降雨侵蚀力高值时段应加强水土保持设施维护.降雨侵蚀力呈南部低、东北部高的空间分布特征,降雨侵蚀力集中在夏季,主要是受季风气候影响,在该季节应尽可能少开展大型地基、边坡开挖等活动,注意水土保持措施布置和完善.降雨与降雨侵蚀力同相位且存在正相关关系,降雨对降雨侵蚀力变化影响重大.

       

      Abstract: Rainfall erosivity is used as an important parameter in soil erosion forecasting models and as a key factor in estimating soil erosion.In this study,the Chongqing section of the Three Gorges Reservoir Area was used as the study area.Based on the daily rainfall data from 1972 to 2018,the Mann-Kendall test,linear correlation analysis,Morlet wavelet analysis and geoinformation technology were used to optimize a simple model suitable for the Three Gorges Reservoir Area and to study the spatial and temporal evolution characteristics and influencing factors of rainfall erosion force.Model III (the daily rainfall erosion force calculation model developed by Yun Xie et al.) has good suitability in the Three Gorges Reservoir Area,with the highest effective coefficient (over 0.76) and low relative deviation coefficient (only about 0.23).The multi-year average rainfall erosion force is 4 480.29MJ·mm/(hm2·h),and the key areas for soil and water conservation work are Kaizhou,Wanzhou and Yunyang districts and counties in that order.The main cycle of interannual variation of rainfall erosion force is 28a,and the maintenance of water and soil conservation facilities should be strengthened during the period of high rainfall erosivity.The spatial distribution of multi-year average rainfall erosion force is characterized by low in the south and high in the northeast.Rainfall erosivity is concentrated in summer,mainly affected by monsoon climate,in that season should be as little as possible to carry out large-scale foundation,slope excavation and other activities,pay attention to the arrangement and perfection of soil and water conservation measures.Rainfall and rainfall erosivity are in phase and positively correlated.Rainfall has a significant impact on the change of rainfall erosivity.

       

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