Runoff coefficient characteristics and its dominant influencing factors in a riparian grassland in the Qinghai Lake wate
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ORIGINAL PAPER
Runoff coefficient characteristics and its dominant influencing factors in a riparian grassland in the Qinghai Lake watershed, NE Qinghai-Tibet Plateau Zhou Li 1 & Dong Liu 2 & Xiao-Yan Li 1 & Huawu Wu 1 & Guang-Yong Li 1,3 & Yue-Tan Li 1,2
Received: 1 June 2015 / Accepted: 26 February 2016 # Saudi Society for Geosciences 2016
Abstract The runoff coefficient is useful for understanding the flood frequency controls in particular hydrologic or climatic regime, especially in the alpine riparian grassland. This study firstly investigated the runoff coefficient characteristics and dominant influencing factors of a riparian grassland in the Qinghai Lake watershed, NE Qinghai-Tibet Plateau. Results showed that the riparian grassland had a low runoff coefficient of 0.71 % in the Qinghai Lake watershed. Results showed that rainfall depth and the 10-min maximum rainfall intensity were the dominant controls on runoff coefficient. The runoff coefficient and rainfall depth had a positively linear relationship. No significant relationship was found between the runoff coefficient and rainfall intensity in the study area. However, the 10-min maximum rainfall intensity significantly influenced the runoff coefficient. The antecedent soil moisture influenced the soil water infiltration. Moreover, the runoff coefficient and antecedent soil moisture had no significant relationship. The investigation of the influencing factors on Zhou Li is the first author of this manuscript. Electronic supplementary material The online version of this article (doi:10.1007/s12517-016-2404-z) contains supplementary material, which is available to authorized users. * Yue-Tan Li [email protected] Zhou Li [email protected]
1
College of Resources Science and Technology, Beijing Normal University, Beijing 100875, People’s Republic of China
2
University of Chinese Academy of Sciences, Beijing 100045, People’s Republic of China
3
National Geomatics Center of China, Beijing 100830, People’s Republic of China
runoff coefficient would help understand the hydrological processes in the alpine riparian grassland. Keywords Overland flow . Rainfall intensity . Antecedent soil moisture . Catchment . Runoff plot
Introduction The runoff coefficient, defined as the portion of rainfall that becomes direct runoff during a rainfall event (Merz et al., 2006; Merz and Bl schl, 2009; Li et al., 2015), is a key concept in engineering hydrology. As a diagnostic variable in runoff generation (Barazzuoli et al., 1989), the runoff coefficient is useful for understanding the flood frequency controls in a particular hydrologic or climatic regime (Merz et al., 2006). Savenije (1996) used the runoff coefficient as a key parameter to simulate water recycling, and found out that the annual runoff coefficient was a simple and useful parameter in evaluating moisture recycling and a helpful indicator in evaluating the importance of land-use practices in rainfall recycling. Previous studies have investigated the spatial and temporal variability of the runoff coeffic
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