scholarly journals Analysis of Runoff Variation Characteristics and Influencing Factors in the Wujiang River Basin in the Past 30 Years

2021 ◽  
Vol 19 (1) ◽  
pp. 372
Author(s):  
Wenxian Guo ◽  
Jianwen Hu ◽  
Hongxiang Wang
Keyword(s):  
River Basin ◽  
Kendall Test ◽  
Annual Runoff ◽  
Underlying Surface ◽  
Vegetation Coverage ◽  
Factors Affecting ◽  
Runoff Variation ◽  
Wujiang River ◽  
Variation Characteristics ◽  
Moderate Change

Changes in climate and the underlying surface are the main factors affecting runoff. Quantitative assessment of runoff characteristics, and determination of the climate and underlying surface contribution to changes in runoff are critical to water resources management and protection. Based on the runoff data from the Wulong Hydrological Station, combined with the Mann-Kendall test, Indicators of Hydrologic Alteration (IHA), Budyko hypothesis, and changes in climate and the underlying surface, this study comprehensively analyzed the runoff in the Wujiang River Basin (WRB). The results showed that: (1) The annual runoff of Wujiang River showed a downward trend, and an abrupt change occurred in 2005. (2) The overall hydrological change in WRB is 46%, reaching a moderate change. (3) The contribution rates of precipitation (P), potential evaporation (ET0), and underlying surface to runoff changes are 61.5%, 11.4%, and 26.9%, respectively. (4) After 2005, the WRB has become more arid, human activities have become more active, vegetation coverage has increased, and the built-up land has increased significantly.

scholarly journals Trends of Runoff Variation and Effects of Main Causal Factors in Mun River, Thailand During 1980–2018

Water ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 831 ◽  
Author(s):  
Renzhi Li ◽  
Heqing Huang ◽  
Guoan Yu ◽  
Hong Yu ◽  
Arika Bridhikitti ◽  
...  
Keyword(s):  
Kendall Test ◽  
Detailed Examination ◽  
Annual Runoff ◽  
Mekong River ◽  
Runoff Variation ◽  
Basin Scale ◽  
Cumulative Curve ◽  
Runoff Decrease ◽  
Detailed Assessment ◽  
Morlet Wavelet Transform

Mun River is the largest tributary of the Mekong River in Thailand and provides abundant water resources not only for an important agricultural area in Thailand but also for the lower Mekong River. To understand how the runoff of Mun River responds to climate change and human activities in recent decades, this study performed a detailed examination of the characteristics of runoff variation based on measurements at two hydrological gauging stations on the main stem of Mun River during 1980–2018. Using the Mann-Kendall test, Morlet wavelet transform and Double Cumulative Curve methods, this study identifies that the variation of annual runoff of Mun River encountered an abruption in 1999/2000, with an increased trend taking place since then. Furthermore, a detailed assessment of the effects of the variations in rainfall, temperature, evaporation, and land use types extracted from remote sensing images at the basin scale reveals that a significant reduction in forest area and slight reductions in evaporation and farmland area taking place since 1999 can lead to an increase in the runoff of Mun River, while the dramatic increase in garden area since 1999 tends to make the runoff decrease.

scholarly journals Variation of Runoff and Precipitation in the Hekou-Longmen Region of the Yellow River Based on Elasticity Analysis

2014 ◽  
Vol 2014 ◽  
pp. 1-11 ◽  
Author(s):  
Erhui Li ◽  
Xingmin Mu ◽  
Guangju Zhao ◽  
Peng Gao ◽  
Hongbo Shao
Keyword(s):  
Abrupt Change ◽  
Yellow River ◽  
Kendall Test ◽  
Annual Runoff ◽  
Practical Significance ◽  
The Yellow River ◽  
Runoff Variation ◽  
Runoff Reduction ◽  
Runoff Change ◽  
Average Annual Runoff

Precipitation is very important to the formation of runoff, and studying of runoff variation and its response to precipitation has practical significance to sustainable utilization of water resources. The study used Mann-Kendall test, anomaly accumulation method, and precipitation elasticity of runoff method to analyze the changes in the relation of precipitation and runoff and the contribution of precipitation to runoff change in the Hekou-Longmen region (from 1957 to 2010), Huangfuchuan watershed (from 1954 to 2010), and Yanhe watershed (from 1952 to 2010) in the middle reaches of the Yellow River. The results showed that runoff appeared a significant decreasing trend(P=0.01)while it was not significant in precipitation in all study areas. In particular, the reductions of average annual runoff in the Hekou-Longmen region, Huangfuchuan watershed, and Yanhe watershed were 72.7%, 87.5%, and 32.2%, respectively, during 2000–2010 compared to the 1950s. There existed two abrupt change points of the runoff in the Hekou-Longmen region and Huangfuchuan watershed, which were detected in 1979 and 1998. But in the Yanhe watershed only one abrupt change point was found in 1996. The precipitation elasticities of runoff were 1.11, 1.09, and 1.26, respectively, and the contributions of precipitation on runoff reduction were 26.4%, 17.9%, and 31.6%, respectively, in the Hekou-Longmen region, Huangfuchuan watershed, and Yanhe watershed.

Nonstationary frequency analysis for annual runoff and sediment load of the Wujiang River

2020 ◽  
Author(s):  
Rongrong Li
Keyword(s):  
River Basin ◽  
Human Activities ◽  
Sediment Load ◽  
Heavy Rain ◽  
Annual Runoff ◽  
Statistical Characteristics ◽  
Explanatory Variables ◽  
Wujiang River ◽  
Before And After ◽  
The Impact

<p>The hydrological series can no longer meet the stationarity hypothesis due to the influence of climate variability and human activities. The process of runoff and sediment load changed significantly under a changing environment. Analyzing the variations of runoff and sediment load and exploring the main influencing causes leading to their changes will be of great help to understand the dynamic process of water and sediment in river basin. Many studies have considered the effects of rainfall and reservoir on the downstream runoff or sediment: the impact of rainfall on runoff or sediment load is normally performed by comparing the statistical characteristics before and after an extreme weather event (e.g. heavy rain of the Yangtze river in 1998); the effect of reservoirs is usually determined by comparing the pre-dam and post-dam frequencies of runoff or sediment load. In this study, the major influencing factors of annual runoff and sediment load in Wujiang River basin were identified firstly based on the results of trend analysis and change-point diagnosis for runoff and sediment load. Then, Generalized Addictive Models in Location, Scale, and Shape (GAMLSS) is used to describe the rainfall and reservoir impacts on nonstationarity of runoff and sediment load, in which, distribution parameters (including the location, scale and shape parameter) are expressed as a function of the explanatory variables. The results show that: (1) runoff and sediment load of Wujiang River decrease with the intensification of climate change and human activities; (2) runoff is mainly affected by rainfall, the operation of cascade reservoirs has critical effect on the sediment load; (3) the correlation between runoff and sediment closely related to the nonstationarity of sediment load, namely, the sediment load change can directly lead to the alteration of dependence between runoff and sediment.</p>

scholarly journals Research on runoff variation trend and hydrological situation variation in Wujiang River Basin

2021 ◽  
Vol 826 (1) ◽  
pp. 012004
Author(s):  
Guo Wei ◽  
Shao Jun ◽  
Ou Yangshuo ◽  
Yao Liqiang ◽  
Wu Guangdong ◽  
...  
Keyword(s):  
River Basin ◽  
Variation Trend ◽  
Runoff Variation ◽  
Wujiang River

Using runoff slope-break to determine dominate factors of runoff decline in Hutuo River Basin, North China

2009 ◽  
Vol 60 (8) ◽  
pp. 2135-2144 ◽  
Author(s):  
Fei Tian ◽  
Yonghui Yang ◽  
Shumin Han
Keyword(s):  
Regression Analysis ◽  
River Basin ◽  
North China ◽  
Kendall Test ◽  
Annual Runoff ◽  
Agricultural Activity ◽  
Sharp Decline ◽  
Mountain Areas ◽  
River Catchment ◽  
Mann Kendall Test

Water resources in North China have declined sharply in recent years. Low runoff (especially in the mountain areas) has been identified as the main factor. Hutuo River Basin (HRB), a typical up-stream basin in North China with two subcatchments (Ye and Hutuo River Catchments), was investigated in this study. Mann-Kendall test was used to determine the general trend of precipitation and runoff for 1960–1999. Then Sequential Mann-Kendall test was used to establish runoff slope-break from which the beginning point of sharp decline in runoff was determined. Finally, regression analysis was done to illustrate runoff decline via comparison of precipitation-runoff correlation for the period prior to and after sharp runoff decline. This was further verified by analysis of rainy season peak runoff flows. The results are as follows: (1) annual runoff decline in the basin is significant while that of precipitation is insignificant at α=0.05 confidence level; (2) sharp decline in runoff in Ye River Catchment (YRC) occurred in 1968 while that in Hutuo River Catchment (HRC) occurred in 1978; (3) based on the regression analysis, human activity has the highest impact on runoff decline in the basin. As runoff slope-breaks in both Catchments strongly coincided with increase in agricultural activity, agricultural water use is considered the dominate factor of runoff decline in the study area.

scholarly journals Analysis of runoff variation characteristics in Yishuhe River Basin

2019 ◽  
Vol 344 ◽  
pp. 012080
Author(s):  
Y H Zhao ◽  
B K Yu ◽  
P Qu ◽  
S Li ◽  
D Q Zhan ◽  
...  
Keyword(s):  
River Basin ◽  
Runoff Variation ◽  
Variation Characteristics
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