scholarly journals Mathematical Modeling of the Suspended Sediment Dynamics in the Riverbeds and Valleys of Lithuanian Rivers and Their Deltas

10.5772/31203 ◽  
2012 ◽  
Author(s):  
Alfonsas Rimkus ◽  
Saulius Vaikasas
Keyword(s):  
Mathematical Modeling ◽  
Suspended Sediment ◽  
Sediment Dynamics ◽  
Lithuanian Rivers

THE INITIAL RESULTS OF THE SUSPENDED SEDIMENT DYNAMICS DURING THE DRY SEASON IN THE HAU RIVER MOUTH AREA

2017 ◽  
Vol 17 (2) ◽  
Author(s):  
Nguyen Ngoc Tien ◽  
Dinh Van Uu ◽  
Nguyen Tho Sao ◽  
Do Huy Cuong ◽  
Nguyen Trung Thanh ◽  
...  
Keyword(s):  
Suspended Sediment ◽  
River Mouth ◽  
Dry Season ◽  
Sediment Dynamics ◽  
Mouth Area ◽  
River Mouth Area ◽  
Initial Results

Suspended sediment dynamics during the inter-monsoon season in the subaqueous Mekong Delta and adjacent shelf, southern Vietnam

2014 ◽  
Vol 79 ◽  
pp. 509-519 ◽  
Author(s):  
Daniel Unverricht ◽  
Thanh Cong Nguyen ◽  
Christoph Heinrich ◽  
Witold Szczuciński ◽  
Niko Lahajnar ◽  
...  
Keyword(s):  
Suspended Sediment ◽  
Monsoon Season ◽  
Mekong Delta ◽  
Sediment Dynamics ◽  
Southern Vietnam

Suspended sediment dynamics in the morteratsch pro‐glacial zone, bernina alps, switzerland

2008 ◽  
Vol 90 (4) ◽  
pp. 299-313 ◽  
Author(s):  
Tim Stott ◽  
Anne‐marie Nuttall ◽  
Nick Eden ◽  
Katie Smith ◽  
Darren Maxwell
Keyword(s):  
Suspended Sediment ◽  
Sediment Dynamics

scholarly journals Hydroclimatic control on suspended sediment dynamics of a regulated Alpine catchment: a conceptual approach

2018 ◽  
Vol 22 (6) ◽  
pp. 3421-3434 ◽  
Author(s):  
Anna Costa ◽  
Daniela Anghileri ◽  
Peter Molnar
Keyword(s):  
Suspended Sediment ◽  
Sediment Concentration ◽  
Sediment Dynamics ◽  
Time Lags ◽  
Rating Curve ◽  
Conceptual Approach ◽  
Ice Melt ◽  
Alpine Catchments ◽  
Erosive Rainfall ◽  
Hydroclimatic Variables

Abstract. We analyse the control of hydroclimatic factors on suspended sediment concentration (SSC) in Alpine catchments by differentiating among the potential contributions of erosion and suspended sediment transport driven by erosive rainfall, defined as liquid precipitation over snow-free surfaces, ice melt from glacierized areas, and snowmelt on hillslopes. We account for the potential impact of hydropower by intercepting sediment fluxes originated in areas diverted to hydropower reservoirs, and by considering the contribution of hydropower releases to SSC. We obtain the hydroclimatic variables from daily gridded datasets of precipitation and temperature, implementing a degree-day model to simulate spatially distributed snow accumulation and snow–ice melt. We estimate hydropower releases by a conceptual approach with a unique virtual reservoir regulated on the basis of a target-volume function, representing normal reservoir operating conditions throughout a hydrological year. An Iterative Input Selection algorithm is used to identify the variables with the highest predictive power for SSC, their explained variance, and characteristic time lags. On this basis, we develop a hydroclimatic multivariate rating curve (HMRC) which accounts for the contributions of the most relevant hydroclimatic input variables mentioned above. We calibrate the HMRC with a gradient-based nonlinear optimization method and we compare its performance with a traditional discharge-based rating curve. We apply the approach in the upper Rhône Basin, a large Swiss Alpine catchment heavily regulated by hydropower. Our results show that the three hydroclimatic processes – erosive rainfall, ice melt, and snowmelt – are significant predictors of mean daily SSC, while hydropower release does not have a significant explanatory power for SSC. The characteristic time lags of the hydroclimatic variables correspond to the typical flow concentration times of the basin. Despite not including discharge, the HMRC performs better than the traditional rating curve in reproducing SSC seasonality, especially during validation at the daily scale. While erosive rainfall determines the daily variability of SSC and extremes, ice melt generates the highest SSC per unit of runoff and represents the largest contribution to total suspended sediment yield. Finally, we show that the HMRC is capable of simulating climate-driven changes in fine sediment dynamics in Alpine catchments. In fact, HMRC can reproduce the changes in SSC in the past 40 years in the Rhône Basin connected to air temperature rise, even though the simulated changes are more gradual than those observed. The approach presented in this paper, based on the analysis of the hydroclimatic control of suspended sediment concentration, allows the exploration of climate-driven changes in fine sediment dynamics in Alpine catchments. The approach can be applied to any Alpine catchment with a pluvio-glacio-nival hydrological regime and adequate hydroclimatic datasets.

Climate Change Effects on Suspended Sediment Dynamics in a Coastal Lagoon: Ria de Aveiro (Portugal)

2018 ◽  
Vol 85 ◽  
pp. 521-525 ◽  
Author(s):  
Sandra Costa ◽  
Ana Picado ◽  
Nuno Vaz ◽  
Carlos Coelho ◽  
Luís Portela ◽  
...  
Keyword(s):  
Climate Change ◽  
Suspended Sediment ◽  
Coastal Lagoon ◽  
Sediment Dynamics ◽  
Ria De Aveiro ◽  
Climate Change Effects

Suspended-sediment dynamics in the tidal reach of a San Francisco Bay tributary

2015 ◽  
Vol 65 (11) ◽  
pp. 1477-1488 ◽  
Author(s):  
Gregory G. Shellenbarger ◽  
Maureen A. Downing-Kunz ◽  
David H. Schoellhamer
Keyword(s):  
Suspended Sediment ◽  
San Francisco ◽  
San Francisco Bay ◽  
Sediment Dynamics ◽  
Tidal Reach
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