基于EMD西安市虚拟水总量波动及其成因的时空多尺度分析

发布时间：2018-05-06 01:30

本文选题：虚拟水 + EMD　；参考：《干旱区地理》2017年02期

【摘要】：根据虚拟水相关原理方法,计算出西安1980-2014年主要农作物虚拟水,通过利用经验模态分解方法(EMD)分析了1980年以来西安市虚拟水总量的波动周期,指出其存在着3 a及10 a准周期的波动,并以10 a的周期波动为主,并从时空多尺度对西安市虚拟水总量波动周期的影响因素进行了分析。结果表明:从时间尺度来看,粮食总产量和作物虚拟水交替影响着西安市虚拟水总量准3 a周期的波动;西安市虚拟水总量准10 a周期左右的波动,在1990年以前主要受作物虚拟水影响,1990年以后受作物虚拟水和粮食总产量波动的交互叠加影响。对西安市三大区域进行EMD分解时发现,在短周期显示,西安市三大区域都是西安市虚拟水总量的主要控制区,其影响程度由高到低依次为:四郊县、远郊区和城六区;在长周期显示,远郊区和四郊县是西安市虚拟水总量波动的主要控制区,且远郊区是第一控制区。
[Abstract]:According to the principle of virtual water correlation, the virtual water of main crops in Xi'an from 1980 to 2014 was calculated. The fluctuation period of the total amount of virtual water in Xi'an since 1980 was analyzed by means of empirical mode decomposition method (EMDD). It is pointed out that there are quasi-periodic fluctuations of 3 years and 10 years, mainly of 10 years, and the influencing factors of the fluctuation period of virtual water in Xi'an are analyzed from time and space multi-scale. The results show that the total grain yield and crop virtual water alternately affect the fluctuation of the quasi-3 a cycle of the total virtual water in Xi'an, and the fluctuation of the total virtual water in Xi'an about 10 a a from the time scale. It was mainly affected by crop virtual water before 1990 and by the interaction of crop virtual water and total grain yield fluctuation after 1990. During the EMD decomposition of the three regions of Xi'an, it is found that in the short period, the three regions of Xi'an are the main control areas of the total amount of virtual water in Xi'an, and the order of influence is as follows: four suburban counties, the far suburbs and the six districts of the city; In the long period it is shown that the far suburbs and the four suburbs are the main control areas for the fluctuation of the total fictitious water in Xi'an and the far suburbs are the first control areas.
【作者单位】：西北大学城市与环境学院;
【基金】：陕西省重点科技创新团队计划项目(2014KTC-27)
【分类号】：TV213.4

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