Estimate of cumulative sediment trapping by multiple reservoirs in large river basins: An example of the Yangtze River basin

article Most existing models are unable to model large spatial pattern of reservoir sedimentation due to the difficulty in accounting for trapping by upstream reservoirs in a multiple reservoir system. In this study we developed and applied a framework on 1358 of large and medium-sized reservoirs (≥10 7 maximum storage capacity) for calculating reservoir sedimentation rates in the multi-reservoir Yangtze River system while accounting for the effect of reduced sediment input due to upstream traps. We further used statistical inferences to assess the sedimentation rates of remaining 42,000 smaller reservoirs. Our results indicate that annual sediment accumu- lated in the Yangtze reservoirs is approximately 691 (±93.7) million tons (Mt), 669 (±89.1) Mt of which is trapped by 1358 large and medium-sized reservoirs and 22 (±4.6) Mt is trapped by smaller reservoirs. Despite the large amount of sediment trapped by reservoirs, the reduction in sediment load at outlet (Datong station) was merely 305 Mt over the last 60 years. The difference may reflect uncertainties in estimates; but it also indicates the important discrepancy between the estimate of the current rate of sediment sequestration in reservoirs and the estimate of the reduction in the land-ocean sediment flux. We further estimated a mean annual rate of storage loss of 5.3 × 10

[1]  S. L. Yang,et al.  Temporal variation in the sediment load of the Yangtze river and the influences of human activities , 2002 .

[2]  J. Syvitski,et al.  Impact of Humans on the Flux of Terrestrial Sediment to the Global Coastal Ocean , 2005, Science.

[3]  Xixi Lu,et al.  Delineation of lakes and reservoirs in large river basins: An example of the Yangtze River Basin, China , 2013 .

[4]  D. Topping,et al.  Colorado River sediment transport: 1. Natural sediment supply limitation and the influence of Glen Canyon Dam , 2000 .

[5]  L. Ran,et al.  Sediment loads response to climate change: A preliminary study of eight large Chinese rivers , 2013 .

[6]  Xxyyzz.  Transactions of the American Society of Civil Engineers 1975 , 1874 .

[7]  John W. Labadie,et al.  Optimal Operation of Multireservoir Systems: State-of-the-Art Review , 2004 .

[8]  G. Brune.  Trap efficiency of reservoirs , 1953 .

[9]  Xixi Lu,et al.  Seasonal Water Discharge and Sediment Load Changes in the Upper Yangtze, China , 2003 .

[10]  D. Stanley,et al.  Nile Delta: Recent Geological Evolution and Human Impact , 1993, Science.

[11]  Yoshiki Saito,et al.  Dam impacts on the Changjiang (Yangtze) River sediment discharge to the sea: The past 55 years and after the Three Gorges Dam , 2006 .

[12]  Desmond E. Walling.  Linking land use, erosion and sediment yields in river basins , 1999 .

[13]  S. L. Yang,et al.  The role of Lake Dongting in regulating the sediment budget of the Yangtze River , 2005 .

[14]  Thomas R. Camp,et al.  Sedimentation and the Design of Settling Tanks , 1946 .

[15]  Andrew Simon,et al.  Reservoir effects on downstream river channel migration , 2000, Environmental Conservation.

[16]  Zhaoyin Wang,et al.  Sediment load reduction in Chinese rivers , 2008 .

[17]  Zhaoyin Wang,et al.  Sediment budget of the Yangtze River , 2007 .

[18]  Z. Dai,et al.  Is the Three Gorges Dam the cause behind the extremely low suspended sediment discharge into the Yangtze (Changjiang) Estuary of 2006? , 2011 .

[19]  J. Syvitski,et al.  Geology, Geography, and Humans Battle for Dominance over the Delivery of Fluvial Sediment to the Coastal Ocean , 2007, The Journal of Geology.

[20]  Jean Poesen,et al.  The application of semi-quantitative methods and reservoir sedimentation rates for the prediction of basin sediment yield in Spain , 2005 .

[21]  V. Jothiprakash,et al.  Modeling the Time Variation of Reservoir Trap Efficiency , 2010 .

[22]  D. Boer,et al.  Factors controlling specific sediment yield in the upper Indus River basin, northern Pakistan , 2008 .

[23]  P. Vlek,et al.  Assessing Sediment-Nutrient Export Rate and Soil Degradation in Mai-Negus Catchment, Northern Ethiopia , 2013 .

[24]  V. K. Bhatt,et al.  Stochastic modelling of the sediment load of the upper Yangtze River (China) , 2002 .

[25]  Jing Zhang,et al.  Dynamics and spatial variability of near-bottom sediment exchange in the Yangtze Estuary, China , 2010 .

[26]  Yunxia Yan,et al.  Spatial patterns of scale effect on specific sediment yield in the Yangtze River basin , 2011 .

[27]  Z. Dai,et al.  Impacts of large dams on downstream fluvial sedimentation: An example of the Three Gorges Dam (TGD) on the Changjiang (Yangtze River) , 2013 .

[28]  Large and episodic decrease of water discharge from the Yangtze River to the sea during the dry season , 2002 .

[29]  G. M. Kondolf,et al.  Estimating reservoir sedimentation rates at large spatial and temporal scales: A case study of California , 2009 .

[30]  Carl B. Brown,et al.  Discussion of "Sedimentation in Reservoirs" , 1944 .

[31]  Harry H. Roberts,et al.  Drowning of the Mississippi Delta due to insufficient sediment supply and global sea-level rise , 2009 .

[32]  H. G. Heinemarm.  a New Sediment Trap Efficiency Curve for Small Reservoirs , 1981 .

[33]  I. Overeem,et al.  Sinking deltas due to human activities , 2009 .

[34]  D. Walling.  The sediment delivery problem , 1983 .

[35]  Olli Varis,et al.  Sediment-related impacts due to upstream reservoir trapping, the Lower Mekong River , 2007 .

[36]  J. Milliman.  Blessed dams or damned dams? , 1997, Nature.

[37]  L. Montanarella,et al.  Modeling sediment yields in Italian catchments. , 2005 .

[38]  Xixi Lu,et al.  Cumulative sediment trapping by reservoirs in large river basins: A case study of the Yellow River basin , 2013 .

[39]  Zhongyuan Chen,et al.  Yangtze River of China: historical analysis of discharge variability and sediment flux , 2001 .

[40]  D. Walling.  Human impact on land : ocean sediment transfer by the world's rivers , 2006 .

[41]  J. Syvitski,et al.  Geomorphic/Tectonic Control of Sediment Discharge to the Ocean: The Importance of Small Mountainous Rivers , 1992, The Journal of Geology.

[42]  Xixi Lu,et al.  Recent Changes of Sediment Yield in the Upper Yangtze, China , 1998, Environmental management.

[43]  J. Poesen,et al.  Estimating trap efficiency of small reservoirs and ponds: methods and implications for the assessment of sediment yield , 2000 .

[44]  C. Vörösmarty,et al.  Anthropogenic sediment retention: major global impact from registered river impoundments , 2003 .

[45]  Xixi Lu,et al.  Basin-wide sediment trapping efficiency of emerging reservoirs along the Mekong , 2010 .

[46]  M. A. Gill.  Sedimentation and useful life of reservoirs , 1979 .

[47]  Yan Wang,et al.  Stepwise decreases of the Huanghe (Yellow River) sediment load (1950–2005): Impacts of climate change and human activities , 2007 .

[48]  Xixi Lu,et al.  Sediment yield variability in the Upper Yangtze, China , 1999 .

[49]  Jing Zhang,et al.  Influence of the Three Gorges Dam on downstream delivery of sediment and its environmental implications, Yangtze River , 2007 .

[50]  R. Wilson,et al.  Reservoir sedimentation surveys in the United States , 2013 .

[51]  B. Kjerfve,et al.  Factors controlling sediment yield in a major South American drainage basin: the Magdalena River, Colombia , 2006 .

[52]  W. White,et al.  Evacuation of Sediments from Reservoirs , 2001 .