Identifying the Multi-Scale Influences of Climate Factors on Runoff Changes in a Typical Karst Watershed Using Wavelet Analysis

Luhua Wu, Shijie Wang, Xiaoyong Bai (), Fei Chen, Chaojun Li, Chen Ran and Sirui Zhang
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Luhua Wu: School of Economics and Management, Tongren University, Tongren 554300, China
Shijie Wang: State Key Laboratory of Environmental Geochemistry of Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
Xiaoyong Bai: State Key Laboratory of Environmental Geochemistry of Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
Fei Chen: State Key Laboratory of Environmental Geochemistry of Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
Chaojun Li: State Key Laboratory of Environmental Geochemistry of Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
Chen Ran: State Key Laboratory of Environmental Geochemistry of Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
Sirui Zhang: State Key Laboratory of Environmental Geochemistry of Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China

Land, 2022, vol. 11, issue 8, 1-31

Abstract: Identifying the impacts of climatic factors on runoff change has become a central topic in climate and hydrology research. This issue, however, has received minimal attention in karst watersheds worldwide. Multi-resolution analysis (MRA), continuous wavelet transform (CWT), cross wavelet transform (XWT) and wavelet transform coherence (WTC) are used to study the teleconnection in time and frequency between climate change and hydrological processes in a typical karst watershed at different time scales. The main results are: (1) All climatic factors exhibit a main cycle at 12-month time scales with runoff changes, but the main periodic bandwidth of rainfall on runoff changes is much wider than that of temperature and evaporation, indicating that rainfall is the main factor affecting runoff changes. (2) In other cycles, the impact of rainfall on runoff changes is the interlacing phenomena with positive and negative, but the impact of temperature and evaporation on runoff change is mainly negative. (3) The response of runoff to rainfall is in time in the high-energy region and the low-energy significant-correlation region and has shown a positive correlation with a smaller phase angle, but it is slightly lagged at 16-month time scales. Moreover, the runoff change lags behind temperature and evaporation for 1–2 months in those regions. (4) It has been found that there is a strong effect of rainfall over runoff, but a lesser effect of temperature and evaporation over runoff. The study sheds light on the main teleconnections between rainfall, evapotranspiration and surface runoff, which in turn might help to attain the better management of water resources in typical karst watersheds.

Keywords: karst; watershed; runoff change; climate factors; wavelet analysis (search for similar items in EconPapers)
JEL-codes: Q15 Q2 Q24 Q28 Q5 R14 R52 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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