Analysis of the impact of precipitation and temperature on the streamflow of the ?rümqi River, Tianshan Mountain, China

4th International Conference on Water Resource and Environment

地球科学;生态环境科学

Liu, Y.C.^1 ; Zhao, K.^1 ; Liu, Y.^1 ; Yin, X.L.^2 ; Labat, D.^3

School of Resources and Environmental Engineering, Jiangxi University of Science and Technology, Jiangxi, Ganzhou

341000, China^1

Guangdong Open Laboratory of Geospatial Information Technology and Application, Guangzhou Institute of Geography, Guangzhou

510070, China^2

Géosciences Environnement Toulouse, Universitéde Toulouse, 4 Avenue Edouard Belin, Toulouse

31400, France^3

关键词: Climate variability;    Continuous Wavelet Transform;    Cross-wavelet analysis;    Cross-wavelet transform;    Northwestern China;    Precipitation and runoff;    Temporal fluctuation;    Wavelet coherences;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/191/1/012135/pdf
DOI  :  10.1088/1755-1315/191/1/012135

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

This study explores the relationship between streamflow time variability and precipitation and air temperature variability, in the upper reaches of the rümqi River in northwestern China. Wavelet analyses are adopted to analyse the multi-time scale features of monthly temperatures, monthly precipitations and monthly runoffs during the years between 1958 and 2006. Results of continuous wavelet transform imply a statistically significant cycle over an approximately 12-month period in the temporal fluctuations of monthly air temperature, precipitation and runoff. Furthermore, monthly temperature shows 66-month and 96-month cycles while monthly precipitation shows 6-month, 30-month and 72-month cycles. Monthly runoff has 6-month, 24-month, 36-month and 72-month cycles. The results of cross wavelet transform and wavelet coherence show that monthly runoff variability correlates with precipitation and air temperature fluctuations at 6-month and 12-month respectively. Other time-scale correlations at 1-year, 2-year, 3-year and 6-year marks are also highlighted between the different time series. These correlations are then explained considering the alpine characteristics of the catchment. Higher air temperatures in the upper reaches of the rümqi River accelerate snow melt and intensify evaporation, thus the relationship between air temperature and runoff is uncertain during different seasons. Overall, summer air temperature controls the annual runoff and precipitation provides a sustained water supply to the upper rümqi River. They constitute the dominant factors that explain the temporal variations of streamflow in the upper rümqi River. Univariate and cross-wavelet analyses on runoff and climate variability clearly offer a useful tool in hydro-meteorological issues in alpine areas.