Analysis of Rainfall-Runoff Variation Characteristics and Influencing Factors in the Dawen River Basin in the Past 50 Years

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.

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Spatiotemporal variation of nitrogen and phosphorus and its main influencing factors in Huangshui River basin

Environmental Monitoring and Assessment ◽

10.1007/s10661-021-09067-1 ◽

2021 ◽

Vol 193 (5) ◽

Author(s):

Biqiong Dong ◽

Tianling Qin ◽

Yu Wang ◽

Yan Zhao ◽

Shanshan Liu ◽

...

Keyword(s):

Cluster Analysis ◽

Influencing Factors ◽

River Basin ◽

Temporal Change ◽

Yellow River ◽

Landscape Patterns ◽

Runoff Coefficient ◽

Rainfall Runoff ◽

Nitrogen And Phosphorus ◽

Water Contaminants

AbstractThe foundation of managing excess nutrients in river is the identification of key physical processes and the control of decisive influencing factors. The existing studies seldom consider the influence of rainfall-runoff relationship and only focus on a few anthropogenic activities and natural attributes factors. To address this issue, a comprehensive set of influencing factors including rainfall-runoff relationship (represented by runoff coefficient), basic physical and chemical parameters of water quality, land use types, landscape patterns, topography, and socioeconomic development was constructed in this study. M–K test and cluster analysis were conducted to identify the temporal mutation and spatial clustering characteristics of NH3-N and TP in Huangshui River basin, respectively. Partial least squares regression was used to elucidate the linkages between water contaminants and the factors. As shown in the results, the temporal mutations of NH3-N and TP were obvious in the middle reaches, with 4 out of 7 catchments in the middle reaches have a larger number of mutations of NH3-N than other catchments. The cluster analysis results of NH3-N and TP among catchments were similar. This study also indicated that although the Huangshui River basin was located in the upper reaches of the Yellow River, the influences of rainfall-runoff relationship on spatiotemporal changes of NH3-N and TP in its sub-basins were limited. Only the temporal change of NH3-N in Jintan catchment in the upstream area was significantly affected by runoff coefficient. The indexes of proportion of water area (PWA), proportion of impervious area (PIA), and proportion of primary industry (PPI) were the top three influencing factors of temporal variation of NH3-N and TP for most catchments in the middle reaches. The temporal change of NH3-N in Jintan catchment in the upstream area was obviously affected by runoff coefficient. The spatial variation of NH3-N and TP were all affected by PWA and proportion of secondary industry significantly. The results of this study can provide theoretical basis and technical support for the control and management of nitrogen and phosphorus pollution in upper reaches of rivers.

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Analysis of runoff variation characteristics in Yishuhe River Basin

IOP Conference Series Earth and Environmental Science ◽

10.1088/1755-1315/344/1/012080 ◽

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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Hydrologic sensitivity of flood runoff and inundation: 2011 Thailand floods in the Chao Phraya River basin

Natural Hazards and Earth System Science ◽

10.5194/nhess-15-1617-2015 ◽

2015 ◽

Vol 15 (7) ◽

pp. 1617-1630 ◽

Cited By ~ 24

Author(s):

T. Sayama ◽

Y. Tatebe ◽

Y. Iwami ◽

S. Tanaka

Keyword(s):

River Basin ◽

Flood Hazard ◽

Economic Damage ◽

Flood Inundation ◽

Rainfall Runoff ◽

The Past ◽

Basin Scale ◽

Chao Phraya River ◽

Large Floods

Abstract. The Thailand floods in 2011 caused unprecedented economic damage in the Chao Phraya River basin. To diagnose the flood hazard characteristics, this study analyses the hydrologic sensitivity of flood runoff and inundation to rainfall. The motivation is to address why the seemingly insignificant monsoon rainfall, or 1.2 times more rainfall than for past large floods, including the ones in 1995 and 2006, resulted in such devastating flooding. To quantify the hydrologic sensitivity, this study simulated long-term rainfall–runoff and inundation for the entire river basin (160 000 km2). The simulation suggested that the flood inundation volume was 1.6 times more in 2011 than for the past flood events. Furthermore, the elasticity index suggested that a 1 % increase in rainfall causes a 2.3 % increase in runoff and a 4.2 % increase in flood inundation. This study highlights the importance of sensitivity quantification for a better understanding of flood hazard characteristics; the presented basin-wide rainfall–runoff–inundation simulation was an effective approach to analyse the sensitivity of flood runoff and inundation at the river basin scale.

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