sediment retention Articles
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Effect of baffles on the hydraulic performance of sediment retention ponds
An investigation of the effect of baffles on retention pond performance using a physical model of an existing sediment retention pond is presented. Analysis of residence time (RTD curves) was used to compare the hydraulic performance of different arrangements of baffles in the pond. Five different arrangements for the design of baffles were studied. The results show that placing a single ...
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Evaluation of hydraulic performance indices for retention ponds
Comprehensive hydraulic analysis of sediment retention ponds is commonly achieved through interpretation of residence time distribution and derivation of indices associated with short-circuiting and mixing. However, the availability of various indices indicates the need for careful selection of the most appropriate indices. This study compares some of the commonly used hydraulic performance ...
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Estimation of sedimentation rates in the distributary basin of the Mississippi River, the Atchafalaya River Basin, USA
The Atchafalaya River Basin (ARB) is the largest distributary basin of the Mississippi River composing anastomosing channels, backwater swamps, freshwater marshes, and wetland forests. Sedimentation in the ARB has presented management issues concerning habitat changes from open water areas to bottomland hardwood forests. A thorough understanding of sediment transport and deposition in the basin ...
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Self-purification process and retention of nitrogen in floodplains of River Nemunas
Due to its catchment size and its significant level of agricultural pollution, the Nemunas river basin has been identified as an agricultural hot spot in the Baltic Sea basin. On average, the total annual inorganic nitrogen runoff into the river is 26.9 × 106 kg, which corresponds to a load of 275 kg km−2 yr−1. A submerged floodplain, covering 605 km2 of the River Nemunas lowland, maintains the ...
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Relationships between benthic sediments and water column Phosphorus in Illinois streams
Received for publication February 19, 2008. Sediments can be important in regulating stream water P concentrations, and this has implications for establishing nutrient standards that have not been fully investigated. We evaluated abiotic and biotic processes to better understand the role of sediments in determining stream water dissolved P concentrations. Sediment and stream water samples were ...
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Ecotoxicological characterisation of sediments from stormwater retention basins
Retention–detention basins are important structures for managing stormwater. However, their long-term operation raises the problem of managing the sediments they accumulate. Potential uses for such sediments have been envisaged, but each sediment must be characterised beforehand to verify its harmlessness. In this paper we address this issue through the development of a battery of ...
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The “nutrient pump:” Iron-poor sediments fuel low nitrogen-to- phosphorus ratios and cyanobacterial blooms in polymictic lakes
Abstract Several lines of evidence from a eutrophic lake show how polymixis enables phosphorus (P) released from anoxic, iron (Fe)-poor sediments to lower nitrogen-to-phosphorus (N : P) ratios and stimulate cyanobacterial blooms. Detailed sediment analyses revealed extensive formation of Fe sulfides, which suppressed porewater Fe levels and prevented sequestration of P in Fe minerals. ...
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Protecting Environmental Capital with the Science of Water Monitoring - Mote at Whenuapai Village - Case Study
Phathom’s technology is helping to safeguard the environment on one of Auckland’s next-generation residential developments: Whenuapai Village, a 41 hectare residential Special Housing Area north of Auckland. Sediment controls are vital on such a site, especially in the rainy season when topsoil washes ...
By Phathom
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GENAQ: Pure water thanks to its exhaustive treatment
GENAQ atmospheric water generators take in ambient air, filter it and extract its moisture. Once the water is extracted by condensation, it is specially treated to obtain the highest quality water at the lowest energy cost. One of the main characteristics that make GENAQ’s atmospheric water generators superior is the quality of the water generated. Equally important is generating ...
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Effects of Biomanipulation on Fish and Plankton Communities in Ten Eutrophic Lakes of Southern Finland
The effects of biomanipulation were studied in ten Finnish lakes to determine responses in fish and plankton communities and water quality after mass removal of cyprinids. From 1997 to 2001, the fish communities shifted from the dominance of large cyprinids to an explosion of small cyprinids and a higher proportion of piscivores in effectively biomanipulated lakes (>200 kg ha-1 3 yr-1). The ...
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Fecal coliform removal in a lightly loaded surface-flow constructed treatment wetland polishing agricultural runoff
Constructed treatment wetlands can be an effective and sustainable method to remove pathogens that pose health risks from agricultural runoff. This study evaluated the removal of fecal coliform (FC) from agricultural runoff in a lightly loaded surface-flow treatment wetland prior to discharge to the Yakima River, Washington State, USA. The 1.6 ha system consisted of a sedimentation basin (1.4 d ...
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Bioavailability and fate of Phosphorus in constructed wetlands receiving agricultural runoff in the San Joaquin Valley, California
Elevated nutrient concentrations in agricultural runoff contribute to seasonal eutrophication and hypoxia in the lower portion of the San Joaquin River, California. Interception and filtration of agricultural runoff by constructed wetlands may improve water quality of return flows ultimately destined for major water bodies. This study evaluated the efficacy of two small flow-through wetlands (2.3 ...
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Sea-level rise and sinking land make deltas extremely vulnerable
In July 2014 we published a photo essay that highlighted the ecological and economic importance of the world’s deltas, pointing out that they are home to nearly half a billion people and provide critical habitat for innumerable plant and animal species. That photo essay also pointed out the danger deltas face: Sea-level rise and human alterations to river systems are threatening to turn the ...
By Ensia
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Exotic Spartina alterniflora invasion enhances sediment N-loss while reducing N retention in mangrove wetland
Wide and rapid Spartina alterniflora invasion has threatened the sustainability of coastal wetlands of China, and has a significant impact on sediment biogeochemical cycle. It also invaded mangrove wetlands, which are the most productive ecosystems. Mangrove can also alleviate the eutrophication in estuaries and coasts due to the highest nitrogen (N) use efficiency and nutrients reabsorption ...
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`Dry` and `liquid` chitosan in stormwater treatment.
Disclaimers: – This post offers my view on the topic based on my review of scientific literature and manufacturer’s documentation available online as well as my own hands-on experience with chitosan and other chemicals in water treatment. – Links to third party websites in this post are not to be considered as my endorsement of their products. What is chitosan? Chitosan, a ...
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