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黄河中游典型河段径流节点分形特征与侵蚀产沙关系初探 被引量:3

Primary Exploration on the Relationship between Fractal Characteristics of Runoff Nodes and Erosion and Sediment Yield in the Middle Reach of the Yellow River
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摘要 径流节点作为地表水文特征的重要组成部分,对地表形态与土壤侵蚀特征有一定的指示作用。该文以ASTER GDEM为数据源,在运用GIS空间分析法提取流域径流节点的基础上,计算径流节点分形维数,探寻了黄土高原重点流失区径流节点分形特征与侵蚀产沙的相关性。实验结果表明:实验流域径流节点数量较多,空间分布相关性强且聚集效应明显;径流节点盒子维数与空间关联维数在局部范围内存在差异,但整体走势一致,空间关联维数较盒子维数更具稳定性;流域发育阶段划分显示,壮年期所占比例大于老年期及幼年期,径流节点分形维数与发育阶段相关性程度显示,壮年期>老年期>幼年期;径流节点分形维数与输沙模数相关性显著,可从流域地貌环境特征与发育阶段进行说明。研究结果初步揭示了地形特征点空间格局与侵蚀产沙相关性,为流域产沙研究提供了新视角。 As an important part of the terrain feature points,runoff node has a certain control indication to the landform and its evolution.To explore the correlation between fractal characteristics of runoff node and erosion and sediment yield in the Loess Plateau soil erosion areas,in this paper,the ASTER GDEM was taken as the data source,and the GIS spatial analysis method of runoff node extraction was used to calculate the runoff node fractal index combined with quantitative fractal theory.The experimental results show that:1)There are a large number of runoff nodes in the experimental basin,which are in different spatial distribution patterns;2)there is a difference between the box dimension and the spatial correlation dimension in the local range,but the overall trend is consistent;3)according to the watershed development stages,the proportion of adult is higher than that of the old and the young,and the degree of correlations between fractal dimension of runoff node and development stages show a descending order with the adult,the old,the young successively;4)there is a negative correlation between the fractal dimension and the sediment delivery modulus at 0.01 significant level,which means,with the increase of fractal dimension,the sediment delivery modulus shows a decreasing trend.The results preliminarily reveal the relationship between the fractal characteristics of runoff nodes and the erosion and sediment yield and provide a new perspective for the study of sediment yield.
作者 邹宝裕 罗明良 ZOU Baoyu;LUO Mingliang(Land and Resources School,China West Normal University,Nanchong 637009,China)
出处 《地理与地理信息科学》 CSCD 北大核心 2018年第2期120-124,共5页 Geography and Geo-Information Science
基金 国家自然科学基金项目(41101348) 西华师范大学基本科研业务费专项资金资助项目(15C002)
关键词 径流节点 盒子维数 空间关联维数 输沙模数 runoff node box dimension spatial correlation dimension sediment delivery modulus
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