Changes in runoff and sediment load from major Chinese rivers to the Pacific Ocean over the period 1955–2010

Liu, Cheng; Sui, Jueyi; He, Yijun; Hirshfield, Faye

doi:10.1016/s1001-6279(14)60007-x

Cited by 64 publications

(22 citation statements)

References 18 publications

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“…Given the better correlations of runoff and PF with sediment load, the operation of dams could play an important role in the sediment load change through (extreme) runoff regulation in the upstream part of the Lancang-Mekong River. Figure 6 indicates that, at the 99% confidence level, the annual LF had nonsignificant negative correlation with sediment load over the past 50 years (Figure 6b), and the correlation was weaker than that of PF (Figure 6a Overall, the increasing trend in sediment load agrees with prior search [41][42][43][44][45], and based on the significant increasing trend of runoff and its significant positive correlation with sediment load, it can be inferred that the increase of sediment load could be mainly attributed to the increase of runoff caused by slight increase of precipitation and land cover change (i.e., from arable and Overall, the increasing trend in sediment load agrees with prior search [41][42][43][44][45], and based on the significant increasing trend of runoff and its significant positive correlation with sediment load, it can be inferred that the increase of sediment load could be mainly attributed to the increase of Overall, the increasing trend in sediment load agrees with prior search [41][42][43][44][45], and based on the significant increasing trend of runoff and its significant positive correlation with sediment load, it can be inferred that the increase of sediment load could be mainly attributed to the increase of runoff caused by slight increase of precipitation and land cover change (i.e., from arable and forested land to construction land since the mid-1980s in Yunnan [22]) in the upstream part of the Lancang-Mekong River since 1980.…”

Section: Relationships Of Sediment Load Between Runoff Mwl Pf and Lfsupporting

confidence: 72%

Response of Sediment Load to Hydrological Change in the Upstream Part of the Lancang-Mekong River over the Past 50 Years

Gui

et al. 2018

Water

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Sediment load and its response to the variations of the hydrological elements are important for the healthy utilization of a river. In this study, the response of sediment load to hydrological change was explored in the upstream part of the Lancang-Mekong River, a major transboundary river originating from the Tibetan Plateau and running through China, over the past 50 years. A sediment rating curve for the Jiuzhou Station was developed based on the available SSC-Q (suspended sediment concentration (SSC) and flow) data and trends in annual precipitation, runoff, peak flow (PF), low flow (LF), maximum water level (MWL), and sediment load were analyzed from 1957 to 2006. The correlation analysis method and Random Forest (RF) were adopted to qualitatively and quantitatively quantify the contribution of each hydrological element to the sediment load change. Results indicated that both the runoff and sediment load showed a significantly upward trend, especially after 1979, at the 95% confidence level. The sediment load had significantly positive correlations with runoff, PF, and MWL at the 99% confidence level, respectively. In particular, the sediment load had the largest significant positive correlation with runoff since 1980. Runoff had the largest variable importance to the sediment load change, followed by PF, MWL, precipitation, and LF. The increasing trend in the sediment load was mainly attributed to the increase of runoff in the upstream part of the Lancang-Mekong River since the mid-1980s.

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Section: Relationships Of Sediment Load Between Runoff Mwl Pf and Lfsupporting

confidence: 72%

Response of Sediment Load to Hydrological Change in the Upstream Part of the Lancang-Mekong River over the Past 50 Years

Gui

et al. 2018

Water

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“…Gross SL output from the upstream and midstream of the Yarlung Tsangpo River was 10.43 Mt. The data sources are from Islam et al (1999) for the Brahmaputra River, from Ali and Boer (2008) and Meybeck (1976) for the Indus River, from He (1995) and Liu et al (2013) for the Mekong River, and from the gauging stations for the Yellow River and the Yangtze River. The study area accounted for 30% area of the whole basin of the Brahmaputra River.…”

Section: Environmental Controls On Sediment Loadsmentioning

confidence: 99%

“…It was found that the Yarlung Tsangpo River has the higher runoff depth but the lowest SSY value. The contribution from the Yarlung Tsangpo River in Islam et al (1999) for the Brahmaputra River, from Ali and Boer (2008) and Meybeck (1976) for the Indus River, from He (1995) and Liu et al (2013) for the Mekong River, and from the gauging stations for the Yellow River and the Yangtze River. terms of sediment load to the Brahmaputra River is small, similar to the relative contributions of the upper Yellow River and the upper Yangtze River, while the sediment load contributions of upper parts in the other two rivers were significantly higher.…”

Section: Comparison With Other Rivers On the Tibetan Plateaumentioning

confidence: 99%

Spatiotemporal variations of suspended sediment transport in the upstream and midstream of the Yarlung Tsangpo River (the upper Brahmaputra), China

Shi

Zhang

et al. 2017

Earth Surf Processes Landf

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The Yarlung Tsangpo River, which flows from west to east across the southern part of the Tibetan Plateau, is the longest river on the plateau and an important center for human habitation in Tibet. Suspended sediment in the river can be used as an important proxy for evaluating regional soil erosion and ecological and environmental conditions. However, sediment transport in the river is rarely reported due to data scarcity. Results from this study based on a daily dataset of 3 years from four main stream gauging stations confirmed the existence of great spatiotemporal variability in suspended sediment transport in the Yarlung Tsangpo River, under interactions of monsoon climate and topographical variability. Temporally, sediment transport or deposition mainly occurred during the summer months from July to September, accounting for 79% to 93% of annual gross sediment load. This coincided with the rainy season from June to August that accounted for 51% to 80% of annual gross precipitation and the flood period from July to September that accounted for approximately 60% of annual gross discharge. The highest specific sediment yield of 177.6 t/km2/yr occurred in the upper midstream with the highest erosion intensity. The lower midstream was dominated by deposition, trapping approximately 40% of total sediment input from its upstream area. Sediment load transported to the midstream terminus was 10.43 Mt/yr with a basin average specific sediment yield of 54 t/km2/yr. Comparison with other plateau‐originated rivers like the upper Yellow River, the upper Yangtze River, the upper Indus River, and the Mekong River indicated that sediment contribution from the studied area was very low. The results provided fundamental information for future studies on soil and water conservation and for the river basin management. Copyright © 2017 John Wiley & Sons, Ltd.

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“…Reservoir building is a human activity exerting the largest and longest impact and interference on rivers (Dolan and Howard, 1974;Graf, 1999;Liu et al, 2013). After a hydro-junction is built on a natural river, the water and sediment inflow conditions under the dam will be changed significantly, the bed load and the bed material load will be hindered in the reservoir and clear water or muddy water containing non-bed material load will be discharged (Petts and Gurnell, 2005 , after the impoundment of the Three Gorges Reservoir, the average sediment runoff of Yichang Hydrologic Station downstream for many years is reduced by about 90% comparing with that before impoundment, approaching to "discharge of clear water".…”

Section: Introductionmentioning

confidence: 99%

Research on Riverbed Adjustment Response of Jingjiang Reach Under the Change of Flow and Sediment

Xq¹

2017

Appl Ecol Env Res

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Abstract. According to the hydrological and sediment data before and after the impoundment in the Three Gorges Reservoir and the measured topographic data of Jingjiang Reach, the article analyzes the response mechanism of erosion and deposition of riverbed in Jingjiang Reach for flow changes, suspended sediment recovery and bed material compensation, makes a judgment of the terrain adjustment trend of the reach in the future. The main conclusions are as follows: After the impoundment of Three Georges Reservoir, the low flow has increasing and streamwise recovery of suspended load strengthen the scouring ability of the overall Jingjiang Reach. After the impoundment of Three Georges Reservoir, the Jingjiang Reach shows conforming and cumulative erosion; the low flow channel is the principal part of riverbed scouring.

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Changes in runoff and sediment load from major Chinese rivers to the Pacific Ocean over the period 1955–2010

Cited by 64 publications

References 18 publications

Response of Sediment Load to Hydrological Change in the Upstream Part of the Lancang-Mekong River over the Past 50 Years

Response of Sediment Load to Hydrological Change in the Upstream Part of the Lancang-Mekong River over the Past 50 Years

Spatiotemporal variations of suspended sediment transport in the upstream and midstream of the Yarlung Tsangpo River (the upper Brahmaputra), China

Research on Riverbed Adjustment Response of Jingjiang Reach Under the Change of Flow and Sediment

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