Sediment load reduction in Chinese rivers

Liu, Cheng; Sui, Jueyi; Wang, Zhaoyin

doi:10.1016/s1001-6279(08)60004-9

Cited by 89 publications

(30 citation statements)

References 7 publications

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“…The reduction in freshwater and sediment supplies from these large river systems present severe environment challenges in the coastal ocean, including sinking deltas and declines in coastal wetland areas. For most of the Asian rivers mentioned above, the sharp drop in the sediment flux was largely attributed to large dam constructions [48,49]. However, this is not consistent with the Mississippi River.…”

Section: Comparison With Other Large Riversmentioning

confidence: 90%

“…This finding was similar for most of the large rivers across China. [48] assessed the annual runoff and sediment transport in 10 large rivers from far North China to far South China and found that the annual sediment yield decreased over the past half century. Furthermore, there has been little change in the average annual runoff; however, a dramatic decrease in the annual sediment load in the southern river has occurred.…”

Section: Comparison With Other Large Riversmentioning

confidence: 99%

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Regime Shift Identification of Runoff and Sediment Loads in the Yellow River Basin, China

Wang

Zhao

et al. 2014

Water

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Runoff and sediment loads have exhibited significant changes over the past six decades in the Yellow River Basin, China. The current study evaluates the changing trends and regime shifts in runoff and sediment loads at both the annual and monthly time scales. The associated spatial and temporal variations are analyzed by a sequential t-test analysis of the regime shifts (STARS) approach and the "breaks for additive seasonal and trend" (BFAST) model using hydrological data at eight stations from the 1950s to 2011. Both runoff and sediment loads exhibit significant declines (p < 0.05), except in the upper reaches of the river near the Tangnaihai station. The regime shifts detected by the STARS approach are not completely consistent with the results from the BFAST method. In most cases, the regime shifts occurred in 1969 and 1986, due to the construction of large reservoirs. Climate change and other human activities, such as large-scale soil and water conservation measures, can result in abrupt changes in hydrological series at some stations. The trapping effects of reservoirs not only cause regime shifts of runoff and sediment loads, but also adjust their inter-annual and seasonal distributions. Various soil and water conservation measures are responsible for the significant reduction in runoff and sediment loads in the mid-lower reaches of the Yellow River Basin. In addition, water withdrawals from both river runoff and ground water play a critical role in the changing trends in runoff OPEN ACCESS Water 2014, 6 3013 and indirectly alter the sediment loads. The findings provide a good reference for the effective promotion of climate change adaptation, water resources planning and river basin management.

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Section: Comparison With Other Large Riversmentioning

confidence: 90%

Section: Comparison With Other Large Riversmentioning

confidence: 99%

Regime Shift Identification of Runoff and Sediment Loads in the Yellow River Basin, China

Wang

Zhao

et al. 2014

Water

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“…According to Table 2, the mean annual value of sediment yield at the outlet of the Nestos River basin before the construction of the dams (mean annual value of sediment yield at the outlet of the entire Nestos River basin) is about 1.9x10 6 t, while after the construction of the dams (mean annual value of sediment yield at the outlet of basin downstream of the Platanovrysi Reservoir) this amounts to 0.33x10 6 t. Therefore, it is evident that the construction and operation of the considered reservoirs has caused a dramatic decrease, of about 83%, in the sediments supplied directly to the basin outlet and indirectly to the neighboring coast. Since Nestos River constitutes one of the main sediment supply sources for the west and east parts of the coastal region in the vicinity of its delta, it is expected that the calculated reduction in the sediment yield that reaches the Nestos River mouth will influence the seashore sediment balance, and it may result in a considerable increase in the erosion rates of the Nestos River mouth and the adjacent shorelines.…”

Section: Main Computations Of Sediment Yield For the Nestos River Basinmentioning

confidence: 99%

Assessment of Reservoir Sedimentation Effect on Coastal Erosion and Evaluation of Sediment Removal Techniques for Its Reduction — The Case of Nestos River, Greece

Andredaki¹,

Georgoulas

Hrissanthou³

et al. 2015

Effects of Sediment Transport on Hydraulic Structures

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Nestos is one of the most important transboundary rivers flowing through Bulgaria and Greece. In the Greek part of the river, two reservoirs, the Thisavros Reservoir and the Platanovrysi Reservoir, have already been constructed and started operating in 1997 and 1999, respectively. In the first part of the chapter, the reservoir sedimentation effect on the coastal erosion is investigated, for the case of the Nestos River delta and the adjacent shorelines, through a combination of mathematical modeling, modern remote sensing techniques, and field surveying, while in the second part, the mechanical removal as well as the flushing of sediment from the reservoir of Platanovrysi and its disposal in the subbasin downstream of the Platanovrysi Dam up to the Nestos River delta are investigated as potential treatment methods of reducing coastal erosion, using a modification of the same mathematical model that is utilized in the first part of the chapter. The overall findings and conclusions arising from the work presented and discussed in the present chapter contribute to the overall need to thoroughly understand the direct effect of dam construction on coastal erosion, as well as to examine the effectiveness of potential sediment management treatments.

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“…Literature review in FPG flow reveals that the distributions of velocity, Reynolds shear stress and turbulence intensities under condition of steady flow have been investigated over smooth bed (Kachwal et al, 2012); over two dimensional bed forms (Mazumdar et al, 2009); over gravel-bed channels (Afzalimehr and Rennie, 2009;Afzalimehr et al, 2010;Song and Chiew, 2001); over sand bed with sediment transport conditions (Emadzadeh et al, 2010;Jamieson et al, 2013;Liu et al, 2012;Rennie et al, 2002); over cobble bed (Afzalimehr, 2010); and over vegetated bed (Afzalimehr et al, 2011;Ghisalberti and Nepf, 2006;Järvelä, 2005;Luhar et al, 2008). Yue et al (2007) conducted a case study in a flume that the channel bed covered by canopy.…”

Section: Introductionmentioning

confidence: 99%

Turbulence characteristics of favorable pressure gradient flows in gravel-bed channel with vegetated walls

Najafabadi

Afzalimehr

Sui

2015

Journal of Hydrology and Hydromechanics

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Abstract:Field observations showed that in many gravel-bed rivers, rice stems and gravel interact with each other and affect the flow structure. This calls to conduct research in more details in laboratory to better understand impacts of interaction between rice stems and gravel bed rivers on the flow structure. The outcome of such investigations can improve the estimation of drag coefficient in hydrodynamic models. Experiments were carried out in a flume with gravel bed and the vegetated vertical flume walls to investigate turbulence characteristics under favorable pressure gradient flows. Results showed that the stress fraction involves both the sweep and ejection dominance near the vegetated flume walls, showing no negative Reynolds shear stress near water surface. The values of exuberance ratio play a significant role on the magnitude of the Reynolds shear stress which varies with the distance from the vegetation. Quadrant analysis reveals that a major part of the momentum flux is transported during a short period of strong turbulence activity near the bed at the central axis. Augmentation of the hole size makes difference between contributions of sweep and ejection with those of the outward and inward interactions near the bed, however, the hole size doesn't play any role near the water surface.

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Sediment load reduction in Chinese rivers

Cited by 89 publications

References 7 publications

Regime Shift Identification of Runoff and Sediment Loads in the Yellow River Basin, China

Regime Shift Identification of Runoff and Sediment Loads in the Yellow River Basin, China

Assessment of Reservoir Sedimentation Effect on Coastal Erosion and Evaluation of Sediment Removal Techniques for Its Reduction — The Case of Nestos River, Greece

Turbulence characteristics of favorable pressure gradient flows in gravel-bed channel with vegetated walls

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