scholarly journals Monitoring Fine-Sediment Volume in the Colorado River Ecosystem, Arizona; Bathymetric Survey Techniques

2009 ◽  
Author(s):  
Matt Kaplinski ◽  
Joseph E. Hazel ◽  
Rod Parnell ◽  
Mike Breedlove ◽  
Keith Kohl ◽  
...  
Keyword(s):  
Colorado River ◽  
Fine Sediment ◽  
River Ecosystem ◽  
Bathymetric Survey ◽  
Survey Techniques ◽  
Sediment Volume

scholarly journals Fine Sediment Modeling During Storm-Based Events in the River Bandon, Ireland

Water ◽  
2019 ◽  
Vol 11 (7) ◽  
pp. 1523 ◽  
Author(s):  
Juan T. García ◽  
Joseph R. Harrington
Keyword(s):  
Suspended Sediment ◽  
Suspended Sediment Concentration ◽  
Sediment Concentration ◽  
Fine Sediment ◽  
Storm Event ◽  
Storm Events ◽  
Event Scale ◽  
Model Based ◽  
Sediment Volume ◽  
Bed Erosion

The River Bandon located in County Cork (Ireland) has been time-continuously monitored by turbidity probes, as well as automatic and manual suspended sediment sampling. The current work evaluates three different models used to estimate the fine sediment concentration during storm-based events over a period of one year. The modeled suspended sediment concentration is compared with that measured at an event scale. Uncertainty indices are calculated and compared with those presented in the bibliography. An empirically-based model was used as a reference, as this model has been previously applied to evaluate sediment behavior over the same time period in the River Bandon. Three other models have been applied to the gathered data. First is an empirically-based storm events model, based on an exponential function for calculation of the sediment output from the bed. A statistically-based approach first developed for sewers was also evaluated. The third model evaluated was a shear stress erosion-based model based on one parameter. The importance of considering the fine sediment volume stored in the bed and its consolidation to predict the suspended sediment concentration during storm events is clearly evident. Taking into account dry weather periods and the bed erosion in previous events, knowledge on the eroded volume for each storm event is necessary to adjust the parameters for each model.

Forestry affects the abundance of Phormidium-dominated biofilms and the functioning of a New Zealand river ecosystem

2017 ◽  
Vol 68 (9) ◽  
pp. 1741 ◽  
Author(s):  
Ibon Aristi ◽  
Joanne E. Clapcott ◽  
Vicenç Acuña ◽  
Arturo Elosegi ◽  
Holly Mills ◽  
...  
Keyword(s):  
New Zealand ◽  
Ecosystem Functioning ◽  
Fine Sediment ◽  
Economic Effects ◽  
Ecosystem Metabolism ◽  
Health Issues ◽  
River Ecosystem ◽  
Pine Plantation ◽  
Decomposition Rates ◽  
Alkaline Phosphate

Toxic cyanobacterial proliferations in water bodies can cause serious environmental and public health issues, as well as having economic effects. Increased inputs of nutrients and fine sediment caused by forestry have been hypothesised as possible causes of increased Phormidium-dominated proliferations in New Zealand rivers. Little is known about the effect of these proliferations on river ecosystem functioning. In the present study, we evaluated five sites along the Maitai River (New Zealand) differing in pine plantation cover of their catchments. We hypothesised that Phormidium biofilms would trap more sediments and recycle more phosphorus than diatoms, that Phormidium proliferations would increase with forestry cover in the catchment and that the varying abundance of Phormidium would affect river ecosystem functioning. Phormidium did not trap more sediment or recycle more phosphorus (measured as alkaline phosphate activity) than diatom biofilms. However, the cover of Phormidium did increase with the proportion of forestry in the catchment. Organic matter decomposition rates (measured as loss of tensile strength of standard cotton strips) varied very little among sites, whereas river ecosystem metabolism increased with the abundance of Phormidium, especially in the lower part of the river. The results of the present study suggest that pine forestry does promote Phormidium biofilm abundance and affect ecosystem functioning in the Maitai River.

Restoration of the Colorado River Ecosystem Using Planned Flooding1

2001 ◽  
Vol 11 (3) ◽  
pp. 633-634 ◽  
Author(s):  
Duncan T. Patten ◽  
Lawrence E. Stevens
Keyword(s):  
Colorado River ◽  
River Ecosystem

Three Experimental High-Flow Releases from Glen Canyon Dam, Arizona-Effects on the Downstream Colorado River Ecosystem

Fact Sheet ◽  
2011 ◽  
Author(s):  
Theodore S. Melis ◽  
Paul E. Grams ◽  
Theodore A. Kennedy ◽  
Barbara E. Ralston ◽  
Christopher T. Robinson ◽  
...  
Keyword(s):  
Colorado River ◽  
High Flow ◽  
River Ecosystem ◽  
Glen Canyon Dam ◽  
Glen Canyon
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