siltation Articles
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Monitoring Siltation
This 15-page White Paper is recommended reading for (A) those who are to create a sediment spill monitoring system, and (B) those who are to create permit rules and regulations for sediment spill monitoring. The paper is devidid in three parts: 1. Justification, why measure sediment spill 2. Advice for the creation of a spill monitoring system 3. Advice for the formulation of permit rules for ...
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USACE - Ohio River, West Virginia - Case Study
Description: SediMeter™ instruments were deployed in the Ohio River, West Virginia, to measure sediment deposition over mussel beds during maintenance dredging on the river. Where: Ohio River, West Virginia Who: USACE Why: Maintenance dredging threatened mussel banks What: Monitor sedimentation/siltation from dredging When: 2009 Model: ...
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Sediment spill monitoring from dredging, using the SediMeter
Strategies for sediment spill monitoring and siltation measurements. The SediMeter allows a gradual increase in the equipment investment as conditions merit, from a single stand-alone logger, to a real-time monitoring network in which all previously purchased equipment can be included. Sediment spill causing siltation gives rise to two separate environmental problems: A suspended sediment plume ...
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Short‐term macroinvertebrate recruitment and sediment accumulation: A novel field chamber approach
Stream‐deposited sediment is one of the major stressors affecting stream biota. Several methods exist to quantify stream sediment embeddedness, but they are relatively qualitative and operationally defined. The authors developed a short‐term in situ embeddedness chamber method to measure aquatic insect recruitment and associated sediment accumulation in a more quantitative, better replicated ...
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Estimation of erosion rate in a small catchment of Loktak wetland, India, using lead-210 (210Pb) technique
Loktak Lake, one of the largest freshwater wetlands in the northeastern India, is under severe pressure due to many reasons-the main being increased siltation from the degraded catchment area. In the present study Nuclear Technique [Lead-210 (210Pb) Technique] has been applied to estimate soil erosion rates in the catchment of the lake. The erosion rates of the various land uses in the catchment ...
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Experimental study of using wastewater sludge as a new drag reduction agent
Siltation is considering as a huge risk to the life and security of dams. Forced to preserve their useful volumes, managers use sediment dredging operations through different techniques. The aim of our work is to investigate the wastewater sludge derived from wastewater treatment as a new natural lubricating instrument during transport of sediment in the pipes and to reduce head losses. From ...
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Linking environmental flows to sediment dynamics
This is a policy discussion paper aimed at addressing possible alternative approaches for environmental flows (e-Flows) assessment and identification within the context of best strategies for fluvial restoration. We focus on dammed rivers in Mediterranean regions. Fluvial species and their ecological integrity are the result of their evolutionary adaptation to river habitats. Flowing water is ...
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Water salinity investigation in the Sundarbans rivers in Bangladesh
Bangladesh, through its complex network of river systems, drains an area of about 1.76 million km2 of the catchments of the Ganges, the Brahmaputra and the Meghna, of which only 7.5% lies in Bangladesh. The Sundarbans is situated in the Ganges catchment area, which is known as the single largest mangrove forest and unique ecosystem in the world. It has an area 6017 km2 and a natural shield that ...
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In-stream bioreactor for agricultural nitrate treatment
Nitrate from agricultural activity contributes to nutrient loading in surface water bodies such as the Mississippi River. This study demonstrates a novel in-stream bioreactor that uses carbonaceous solids (woodchips) to promote denitrification of agricultural drainage. The reactor (40 m3) was trenched into the bottom of an existing agricultural drainage ditch in southern Ontario (Avon site), and ...
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Microbe-assisted phytoremediation approach for ecological restoration of zinc mine spoil dump
Mining is one of the sectors that impacts air, water and soil pollution. The various environmental problems that are associated with mining activities are deforestation, removal of fertile topsoil, unstable slopes prone to sliding and erosion, siltation of water bodies due to wash off of mineral overburden dumps, air pollution due to discharge of dust and noise pollution. The most effective means ...
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SRS Crisafulli Survey: Silty Rivers of the World
SRS Crisafulli Survey: Silty Rivers of the World In Steven Solomon's book Water, The Epic Struggle for Wealth, Power and Civilization, he lists some of the world's siltiest rivers. Which river do you think is the most silty? Let's take a closer look at 5 silty rivers. A quick search on Wikipedia revealed the following data. The Colorado River The Colorado River is the principal river of ...
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Spencer Dam (Nebraska, 2019) - Case Study
Spencer Dam was a dam constructed for hydropower in 1927 on the Niobrara River in northern Nebraska. The dam consisted of a 3,200-foot-long embankment section and a 500-foot-long powerhouse/spillway section. The dam’s maximum height was 26 feet. The spillway consisted of four 33.5-foot-wide bays controlled by Tainter gates, one 10-foot-wide trash/ice bay with a Tainter gate, and five ...
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Living with the floods, not against them
“Yes, we are illiterate sir, but we are engineers as far as our experience with water and rivers is concerned”, says Phushi Mahato, a villager in the Gosi Kandak floodplains in North-Bihar in India. As an outcome of water resource management that failed to understand the role of fluvial regimes in delta, Phushi and his fellow village members have now become vulnerable to floods ...
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The SediMeter turns 30 years, but where did it come from?
A hundred years ago Physical Geography concerned itself with the description of landforms and processes, and deductions about how these processes had led to those landscapes. Then in the 1930’s a research student in Uppsala called Filip Hjulström crossed the river called Fyrisån every day on his way to the department. He stopped, took a water sample and measured the water level. ...
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Release of the 2006 IUCN Red List of Threatened Species reveals ongoing decline of the status of plants and animals
The number of known threatened species reaches 16,119. The ranks of those facing extinction are joined by familiar species like the polar bear, hippopotamus and desert gazelles; together with ocean sharks, freshwater fish and Mediterranean flowers. Positive action has helped the white-tailed eagle and offers a glimmer of hope to Indian vultures. Geneva, Switzerland, 2 May 2006 (IUCN) – The ...
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