| 径流过程分维数与其主要影响因素的定量研究 |
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| 引用本文： | 张登,崔晨风,陈刚,李云格.径流过程分维数与其主要影响因素的定量研究[J].水利与建筑工程学报,2021,0(1):231-236. |
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| 作者姓名： | 张登 崔晨风 陈刚 李云格 |
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| 作者单位： | 西北农林科技大学水利与建筑工程学院，陕西杨凌７１２１００ |
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| 基金项目： | 国家国际科技合作专项项目“提高旱区作物水分利用效率的关键技术研究与应用”(2014DFG72150);国家自然科学基金面上项目“变化环境下西北旱区农业水资源系统的响应模拟及敏感性评估”(51279166)。 |
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| 摘 要： | 为研究分维数与其主要影响因素的定量关系，收集泾河张家山水文站的径流资料和该流域长武、环县、崆峒气象站日降雨数据以及ＮＤＶＩ遥感影像，分别选取降水不均匀系数为代表降水年内分配不均匀程度的指标和ＮＤＶＩ为反映人类活动对流域植被覆盖影响的指标，经过归一化处理后，使用ＭＴＡＬＡＢ软件得出以年为单位的泾河径流过程分维数与该流域降水不均匀系数和ＮＤＶＩ的定量关系式。结果表明分维数与降水不均匀系数呈正相关（Ｒ＝０．５５７１），而与ＮＤＶＩ呈负相关（Ｒ＝０．２２７８）。说明降水年内分配越不均匀，植被覆盖越小，径流过程越复杂，分维数就越大，符合平常认知；泾河流域的降水对径流过程的影响较流域植被覆盖更大。
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| 关 键 词： | 分形理论 泾河流域 分维数 ＮＤＶＩ 降水不均匀系数 |
Quantitative Study on Fractal Dimension of Runoff Process and Its Main Influence Factors |
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| ZHANG Deng,CUI Chenfeng,CHEN Gang,LI Yunge.Quantitative Study on Fractal Dimension of Runoff Process and Its Main Influence Factors[J].Journal of Water Resources Architectural Engineering,2021,0(1):231-236. |
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| Authors: | ZHANG Deng CUI Chenfeng CHEN Gang LI Yunge |
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| Affiliation: | (College of Water Resources and Architectural Engineering,Northwest A&F Uninersity,Yangling,Shaanxi 712100,China) |
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| Abstract: | In order to analyze the quantitative relationship between the fractal dimension and its main influence factors,this paper selects the rainfall non-uniformity coefficient as an indicator representing the uneven distribution degree of precipitation within a year and NDVI as an indicator reflecting the impact of human activities on vegetation coverage in the watershed.Based on the runoff data of Zhangjiashan hydrological station of the Jing River,the daily rainfall data of Changwu,Huanxian,and Kongtong weather stations in the same watershed and the NDVI remote sensing image,after normalization,the Matlab software is used to obtain the quantitative relational formula of fractal dimension of the Jing River runoff process,rainfall non-uniformity coefficient and NDVI in this basin in units of years.The results show that fractal dimension is positively correlated with the rainfall non-uniformity coefficient(R=0.5571),and negatively correlated with NDVI(R=0.2278).It shows that the more uneven the distribution of rainfall during the year,the smaller the vegetation cover,the more complex the runoff process,the larger the fractal dimension,which is consistent with the common knowledge and the influence of precipitation on the runoff process in the basin of the Jing River is greater than the vegetation coverage in the basin. |
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| Keywords: | fractal theory Jing River basin fractal dimension NDVI rainfall non-uniformity coefficient |
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