A Study on Temporal and Spatial Change of Drought in Northwest Oasis Based on Averaged Waiting Time for Precipitation Index

CHEN Li-li; LIU Pu-xing; YAO Yu-long

doi:10.13961/j.cnki.stbctb.2014.04.057

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A Study on Temporal and Spatial Change of Drought in Northwest Oasis Based on Averaged Waiting Time for Precipitation Index

- A Study on Temporal and Spatial Change of Drought in Northwest Oasis Based on Averaged Waiting Time for Precipitation Index
- Bulletin of Soiland Water Conservation Vol. 33, Issue 4, Pages: 220-225(2014)
- 作者机构：
  
  西北师范大学地理与环境科学学院,甘肃,兰州,730070
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.2014.04.057
  CLC：
- Published：2014
- 稿件说明：
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CHEN Li-li, LIU Pu-xing, YAO Yu-long. A Study on Temporal and Spatial Change of Drought in Northwest Oasis Based on Averaged Waiting Time for Precipitation Index[J]. Bulletin of Soiland Water Conservation, 2014, 33(4): 220-225.
DOI：

CHEN Li-li, LIU Pu-xing, YAO Yu-long. A Study on Temporal and Spatial Change of Drought in Northwest Oasis Based on Averaged Waiting Time for Precipitation Index[J]. Bulletin of Soiland Water Conservation, 2014, 33(4): 220-225. DOI： 10.13961/j.cnki.stbctb.2014.04.057.

摘要

根据西北绿洲1960-2011年86个气象站点的日降水资料

基于降水平均等待时间指数(AWTP)转化而来的相当干期(EDP)

利用线性回归和反距离插值(IDW)等统计方法分析了西北绿洲的干旱时空变化。结果表明

西北绿洲的相当干期年变化总体呈下降趋势

其倾向率为-1.109/10 a。在52 a中

1991年的相当干期最大

达到了108.9 d。西北绿洲相当干期季节变化均呈降低趋势

春季减小最明显。突变分析表明

1976和1996年为相当干期的突变年。周期分析表明

西北绿洲的5个分区分别存在13

10 a的主周期。西北绿洲相当干期呈以塔里木盆地的西北部和新疆地区吐鲁番盆地-塔里木盆地的东南部以及柴达木盆地西部组成的区域为两个中心向四周呈减小的半环状分布特征。

Abstract

Based on the daily precipitation data from 86 meteorological stations in northwest oasis during 1960-2011

using the methods of equivalent dry period(EDP) and inverse distance weighted interpolation(IDW)

the variation characteristics of drought in northwest oasis was analyzed. The results indicated as follows: the annual EDP in northwest oasis presented a decreasing trend

and the change tendency of EDP being -1.109/10 a. In 52 years

the maximum value of EDP presented in 1991

and it reached 108.9 d. The seasonal EDP in northwest oasis presented a decreasing trend

and spring was the most significant. The abrupt change of EDP happened in 1976 and 1996

respectively. Morlet wavelet analysis of EDP in northwest oasis showed that there were periods of 13

10 a in five regions of northwest oasis. The difference of spatial distribution of drought in northwest oasis area is obvious

AWTP index and quite dry period both show that the drought centers are in northwest of Tarim basin and Turpan basin-southeast of Tarim basin-west of Tsaidam basin

and it was decreased from the two centers to the surrounding.

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