scholarly journals Suspended-sediment transport rates at the 1.5-year recurrence interval for ecoregions of the United States: transport conditions at the bankfull and effective discharge?

Geomorphology ◽  
2004 ◽  
Vol 58 (1-4) ◽  
pp. 243-262 ◽  
Author(s):  
Andrew Simon ◽  
Wendy Dickerson ◽  
Amanda Heins
Keyword(s):  
United States ◽  
Sediment Transport ◽  
Suspended Sediment ◽  
The United States ◽  
Recurrence Interval ◽  
Suspended Sediment Transport ◽  
Effective Discharge

scholarly journals A new large-scale suspended sediment model and its application over the United States

2021 ◽  
Author(s):  
Hong-Yi Li ◽  
Zeli Tan ◽  
Hongbo Ma ◽  
Zhenduo Zhu ◽  
Guta Abeshu ◽  
...  
Keyword(s):  
United States ◽  
Sediment Transport ◽  
Suspended Sediment ◽  
The United States ◽  
Transport Processes ◽  
Model Parameters ◽  
Earth System ◽  
Sediment Discharge ◽  
River Systems ◽  
Monthly Streamflow

Abstract. Suspended sediment plays a vital role in the regional and global cycling of carbon and nutrients by carrying carbon and nutrients from headwaters into lowland rivers and the oceans. Sediment transport through river systems is often fundamentally modified by human activities like reservoir management. However, a physically based representation of sediment transport is still missing in most existing earth system models (ESMs), which are essential tools for modeling and predicting earth system changes. Here, we introduce a multi-process river sediment module for ESMs, which includes: 1) hillslope soil erosion and sediment discharge into streams; 2) sediment transport processes through river networks; 3) reservoir operation based on the inflows from upstream areas and water demand from downstream areas; and 4) sediment trapping by reservoirs. All model parameters are estimated a priori without calibration. We apply this new sediment modeling framework to the contiguous United States and validate it against historical observations of monthly streamflow and sediment discharges at 35 river gauges. The model reasonably well captures the long-term balance and seasonal variations of suspended sediment in large river systems. Furthermore, our model results show that suspended sediment discharge in managed rivers is affected more by reservoirs' direct trapping of sediment particles than by their flow regulation. This new sediment module enables future modeling of the transportation and transformation of carbon and nutrients carried by the fine sediment along the river-ocean continuum to close the global carbon and nutrients cycles.

Variability of effective discharge for suspended sediment transport in a large semi-arid river basin

2010 ◽  
Vol 388 (3-4) ◽  
pp. 357-369 ◽  
Author(s):  
Yuanxu Ma ◽  
He Qing Huang ◽  
Jiongxin Xu ◽  
Gary J. Brierley ◽  
Zhijun Yao
Keyword(s):  
Sediment Transport ◽  
Suspended Sediment ◽  
River Basin ◽  
Suspended Sediment Transport ◽  
Effective Discharge ◽  
Semi Arid

Suspended Sediment and Turbidity Restrictions Associated With Instream Construction Activities in the United States: An Assessment of Biological Relevance

1998 ◽  
Author(s):  
Scott M. Reid ◽  
Paul G. Anderson
Keyword(s):  
United States ◽  
Sediment Transport ◽  
Suspended Sediment ◽  
Primary Productivity ◽  
The United States ◽  
Sediment Deposition ◽  
Timing Constraints ◽  
Aquatic Resources ◽  
Biological Relevance ◽  
Construction Methods

Sediment released during pipeline water crossings has the potential to negatively affect downstream aquatic resources. Regulation of pipeline water crossings has been directed through the application of allowable construction methods, timing constraints and numerical turbidity restrictions on construction permits. Past applications of turbidity restrictions are criticized for the following reasons: duration of exposure or sediment deposition effects are not considered; some applied restrictions are for the protection of primary productivity in lakes; and, defined mixing zones do not appear to incorporate expected levels of sediment generation, or sediment transport principles. Alternate approaches to defining permit restriction are proposed.

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