scholarly journals Impacts of Climate Change and Human Activities on Runoff and Sediment Load of the Xiliugou Basin in the Upper Yellow River

2015 ◽  
Vol 2015 ◽  
pp. 1-12 ◽  
Author(s):  
Haifang Yao ◽  
Changxing Shi ◽  
Wenwei Shao ◽  
Jianbin Bai ◽  
Hui Yang
Keyword(s):  
Climate Change ◽  
Water Conservation ◽  
Human Activities ◽  
Sediment Load ◽  
Yellow River ◽  
Dominant Role ◽  
Water Discharge ◽  
Semiarid Region ◽  
Upper Yellow River ◽  
Using Data

Using data of temperature, wind, precipitation, water discharge, and sediment load, the changes in runoff and sediment load of the Xiliugou basin in the upper Yellow River were investigated and the contributions of climate change and human activities to these changes were quantitatively estimated. Results show that the runoff and sediment load of the stream declined gradually in 1960–2012. According to the abrupt change point detected, the runoff and sediment series were divided into two periods: 1960–1998 and 1999–2012. The reductions of runoff and sediment load in 1999–2012 were found to be related to climate change and human activities, and the latter played a dominant role with a contribution of about 68% and 75%, respectively. The effects of rainfall intensity should be considered to avoid overestimating or underestimating the contributions of rainfall changes to the variations of runoff and sediment load in the semiarid region. An inspection of changes in water discharge and sediment regime indicated that the frequency of discharge between 0 and 5 m3/s increased while that between 5 and 1000 m3/s decreased in 2006–2012. This phenomenon can be attributed principally to the soil and water conservation practices.

Stepwise decreases of the Huanghe (Yellow River) sediment load (1950–2005): Impacts of climate change and human activities

2007 ◽  
Vol 57 (3-4) ◽  
pp. 331-354 ◽  
Author(s):  
Houjie Wang ◽  
Zuosheng Yang ◽  
Yoshiki Saito ◽  
J. Paul Liu ◽  
Xiaoxia Sun ◽  
...  
Keyword(s):  
Climate Change ◽  
Human Activities ◽  
River Sediment ◽  
Sediment Load ◽  
Yellow River ◽  
Yellow River Sediment ◽  
Impacts Of Climate Change

scholarly journals Impacts of climate change and human activities on the water discharge and sediment load of the Pearl River, southern China

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Xing Wei ◽  
Shuqun Cai ◽  
Peitong Ni ◽  
Weikang Zhan
Keyword(s):  
Climate Change ◽  
Human Activities ◽  
Abrupt Change ◽  
Sediment Load ◽  
Southern Oscillation ◽  
Southern China ◽  
Water Discharge ◽  
Pearl River ◽  
Enso Events ◽  
The Pearl River

Abstract Global climate change and human activities have important effects on the water discharge and sediment load of the Pearl River. In this study, the water discharge and sediment load were investigated by using hydro-meteorological data from 1954 to 2018. The linear regression, Mann–Kendall abrupt test and double mass curve were employed to detect trends and abrupt change-points in water discharge and sediment load and to quantify the effects of climate change and human activities on water discharge and sediment load. The results revealed that the annual sediment load exhibited a significant decreasing trend at a rate of − 2.24 × 104 t/year, regardless of water discharge, and an abrupt change occurred in 1998. Human activities, especially dam construction contributed 96% to this change, while 4% was due to climate change. El Niño/Southern Oscillation (ENSO) events are often associated with low precipitation, resulting in low water discharge and sediment load, indicating that changes in ENSO periodicity could affect the inter-annual periodic variations of water discharge and sediment load. As population and economy boom, more dams are being built in the Pearl River basin, and special attention should be paid to the management and mitigation of the effects of dams on sediment load.

scholarly journals Runoff and sediment load of the Yan River, China: changes over the last 60 yr

2013 ◽  
Vol 10 (1) ◽  
pp. 1213-1249 ◽  
Author(s):  
F. Wang ◽  
X. Mu ◽  
R. Hessel ◽  
W. Zhang ◽  
C. Ritsema ◽  
...  
Keyword(s):  
Climate Change ◽  
Water Conservation ◽  
Human Activities ◽  
Soil Loss ◽  
Sediment Load ◽  
Human Impacts ◽  
Annual Runoff ◽  
Runoff And Soil Loss ◽  
Soil And Water ◽  
Precipitation And Temperature

Abstract. Runoff and sediment load changes are affected by climate change and human activities in an integrated way. Historical insight into these effects can not only improve the knowledge of river processes, but also promote more effective land and water management. In this study, we looked at runoff and sediment change in the Yan River Basin, Loess Plateau, China, using data sets on land use and land cover (LUC), monthly data of precipitation and temperature, and observed data on runoff and sediment load from 1952 to 2010 at the Ganguyi Hydrologic Station. Available data on soil and water conservation structures and their effect were also studied. Five main findings emerged from the data analysis. (1) The annual runoff and sediment load varied greatly during the last 60 yr and both had coefficients of variation that were much larger than those of precipitation and temperature. (2) Annual runoff and sediment load both showed a significant trend of linear decline over the period studied. The climate data showed a non-significant decline in precipitation over the same period, and a very significant increase in temperature; both can help explain the observed declines in runoff and soil loss. (3) Based on a mass curve analysis with anomalies of normalized runoff and sediment load, 4 stages in the change of runoff and soil loss were identified: 1951 to 1971 (Stage I), 1972 to 1986 (Stage II), 1987 to 1996 (Stage III) and 1997 to 2010 (Stage IV). (4) When years were paired based on similar precipitation and temperature condition (SPTC) and used to assess the impacts of human activities, it was found that 6 sets of paired years out of 12 (50%) showed a decline in runoff 8 (67%) a decline in sediment load and 9 (75%) a decline in sediment concentration The other sets show an increasing change with the time. It showed the complexity of human impacts. (5) Human impacts relating to LUC change and soil and water measures in this basin were significant because of both the transfer of sloping cropland into non-food vegetation or terraces and the siltation in the reservoirs and behind check dams. Data indicated that about 56 Mt of sediment was deposited annually from 1960–1999 as a result of the soil and water conservation structures, which is significantly more than the 42 Mt that is, on average, leaving the Yan River Basin as sediment load each year. Although the effects of climate change and human action could not be separated, analysis of the data indicated that both had a significant impact on runoff and sediment loss in the area.

scholarly journals Runoff and Sediment load of the Yan River, China: changes over the last 60 yr

2013 ◽  
Vol 17 (7) ◽  
pp. 2515-2527 ◽  
Author(s):  
F. Wang ◽  
X. Mu ◽  
R. Hessel ◽  
W. Zhang ◽  
C. J. Ritsema ◽  
...  
Keyword(s):  
Climate Change ◽  
Water Conservation ◽  
Human Activities ◽  
Soil Loss ◽  
Sediment Load ◽  
Human Impacts ◽  
Annual Runoff ◽  
Runoff And Soil Loss ◽  
Soil And Water ◽  
Precipitation And Temperature

Abstract. Runoff and sediment load changes are affected by climate change and human activities in an integrated way. Historical insight into these effects can not only improve the knowledge of river processes, but also promote more effective land and water management. In this study, we looked at runoff and sediment change in the Yan River basin, Loess Plateau, China, using data sets on land use and land cover (LUC), monthly data of precipitation and temperature, and observed data on runoff and sediment load from 1952 to 2010 at the Ganguyi Hydrologic Station. Available data on soil and water conservation structures and their effect were also studied. Five main findings emerged from the data analysis. (1) The annual runoff and sediment load varied greatly during the last 60 yr, and both had coefficients of variation that were much larger than those of precipitation and temperature. (2) Annual runoff and sediment load both showed a significant trend of linear decline over the period studied. The climate data showed a non-significant decline in precipitation over the same period, and a very significant increase in temperature; both can help explain the observed declines in runoff and soil loss. (3) Based on a mass curve analysis with anomalies of normalized runoff and sediment load, 4 stages in the change of runoff and soil loss were identified: 1951 to 1971 (Stage I), 1972 to 1986 (Stage II), 1987 to 1996 (Stage III) and 1997 to 2010 (Stage IV). (4) When years were paired based on similar precipitation and temperature condition (SPTC) and used to assess the impacts of human activities, it was found that 6 sets of paired years out of 12 (50%) showed a decline in runoff, 8 (67%) a decline in sediment load, and 9 (75%) a decline in sediment concentration. The other sets show an increasing change with time. It showed the complexity of human impacts. (5) Human impacts relating to LUC change and soil and water measures in this basin were significant because of both the transfer of sloping cropland into non-food vegetation or terraces, and the siltation in the reservoirs and behind check dams. Data indicated that about 56 Mt of sediment was deposited annually from 1960–1999 as a result of the soil and water conservation structures, which is significantly more than the average 42 Mt, leaving the Yan River basin as sediment load each year. Although the effects of climate change and human action could not be separated, analysis of the data indicated that both had a significant impact on runoff and sediment load in the area.

scholarly journals Identifying dominant component of runoff yield processes: a case study in a sub-basin of the middle Yellow River

2021 ◽  
Author(s):  
Li Zhang ◽  
Caihong Hu ◽  
Shengqi Jian ◽  
Qiang Wu ◽  
Guang Ran ◽  
...  
Keyword(s):  
Climate Change ◽  
Water Conservation ◽  
Human Activities ◽  
Large Scale ◽  
Overland Flow ◽  
Yellow River ◽  
Potential Evapotranspiration ◽  
Subsurface Flow ◽  
Runoff Generation ◽  
Runoff Reduction

Abstract The effects of long-term natural climate change and human activities on runoff generation mechanism in the middle Yellow River Basin are long-standing concerns. This study analyzed the characteristics of hydro-climatic variables in the meso-scale Tuweihe catchment based on the observed data for the period 1956–2016 and a climate elastic method. The spatial distribution of dominant runoff processes (DRP) following land use changes in case of rainfall was identified. The results show significant decreasing trends in annual runoff, whereas slightly downward trends are identified for annual precipitation and potential evapotranspiration, 1984 is detected as the mutation year of the study period. The average contributions of climate change and human activities to the runoff reduction in the Tuweihe catchment were 33.2% and 66.8%, respectively. In general, the influences of human activities on runoff are applied mostly through the alteration of the catchment characteristics. The dominant runoff processes changes between 1980 and 2015 show significant effects of large-scale soil and water conservation measures in the Tuweihe catchment. We found that Hortonian overland flow (HOF) and fast subsurface flow (SSF1) were the two main processes in 1980 (30.3% and 34.4% respectively), but the proportion of HOF decreased by 9.6% in 2015. The proportions of saturation overland flow (SOF) and SSF have increased to varying degrees, which means that the catchment is more prone to generate subsurface flow processes. Consequently, under similar rainfall conditions, the runoff yield of flood events decreases in the second period.

Decline of sediment transport due to damming and eco-engineering is approaching its limits

2021 ◽  
Author(s):  
Boyan Li ◽  
Yunchen Wang ◽  
Chao Wang ◽  
Wei Wang ◽  
Aiwen Lin ◽  
...  
Keyword(s):  
Climate Change ◽  
Sediment Transport ◽  
Soil Erosion ◽  
River Basin ◽  
Water Conservation ◽  
Human Activities ◽  
Sediment Load ◽  
Yangtze River Basin ◽  
Sensitivity Index ◽  
The Impact

Abstract Sediment transport from rivers to ocean is increasingly influenced by climate change and intensive human activities1, constituting a research priority of global relevance2. However, little attention has been paid to quantify and predict the contribution of driving factors to the sediment load. By integrating local-scale hydrologic modeling with soil erosion estimation model, and the soil erosion and sediment yield balance equation, we quantify watershed-scale changes in sediment load under forecasted climate change and human activities in the Yangtze River Basin (YRB), China. We also develop a new metric, the sediment load sensitivity index, that identifies sensitive to anthropogenic variability over the past 30 years. It was found that the reservoirs deposition was the primary factor (81.37 %) among human activities contributing to the decline in sediment load, followed by the soil and water conservation measures (SWCM) (18.63 %). The sediment load shows a slight increasing trend for the 1.5 °C and 2.0 °C global warming at 2020–2039 and 2040–2059, respectively. Climate change dominates the sediment load trend in the future due to the effectiveness of dams and reservoirs decreases and the saturation of the capacity of the SWCM to capture sediment. Although these findings indicate the importance of the impact of climate change on changes in sediment load, it is necessary to apply them to appropriate management to adapt to climate changes in future river basin management policies.

Sign in / Sign up

Export Citation Format

Share Document