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Penaeus monodon; ammonia; concrete; effluents; feeds; juveniles; nitrogen; nutrients; phosphorus; ponds; sediments; shrimp; shrimp culture; soil; stocking rate; tanks; water harvesting; water quality; weight gain
Abstract:
... An experiment was conducted for intensive culture of shrimp (Penaeus monodon) in concrete tanks for a period of 90 days without water exchange (closed system) to determine the effects of stocking density (25 and 50 juveniles per m2) and bottom substrate (soil and concrete) on water quality, shrimp growth performance, and nutrient distribution and budget. Total ammonia and nitrite-nitrogen concentr ...
... Seasonal variations and effect of oceanographic processes such as erosion and/or accretion along beaches are important to understand their impact on coastal morphological variations. Detailed investigations were taken up to analyse the volumetric and morphologic variations of the beaches between Pirwadi (latitude 16° 12′ N, longitude 73° 26.55′ E) and Sarjekot (latitude 16° 05′ N, longitude 73° 27 ...
... A harbor sediment is successfully recycled at 1150°C as low water-absorption lightweight aggregate via addition of waste glass powder. Sodium content in the waste glass is responsible for the formation of low-viscosity viscous phases during firing process to encapsulate the gases generated for bloating pellet samples. Water sorption capacity of the lightweight products can be considerably reduced ...
... Pyrethroid insecticides used in urban and suburban contexts have been found in urban creek sediments and associated with toxicity in aquatic bioassays. The objectives of this study were to evaluate the main factors contributing to the off-target transport of pyrethroid insecticides from surfaces typical of residential landscapes. Controlled rainfall simulations over concrete, bare soil, and turf p ...
... Siloxane use in consumer products (i.e., fabrics, paper, concrete, wood, adhesive surfaces) has significantly increased in recent years due to their excellent water repelling and antimicrobial characteristics. The objectives of this study were to evaluate the release mechanisms of two siloxane compounds, octamethylcyclotetrasiloxane (D4) and decamethylcyclopentasiloxane (D5), which have been detec ...
... Around 0 AD, the Rhine-Meuse estuary in the southwest of the Netherlands was a typical coastal plain estuary. Drainage of peatland and land subsidence behind the dunes later caused the sea to penetrate into the land. Most of the peat was eroded, and by 1000 AD the so-called Delta area had turned into a landscape of large estuaries and intertidal zones. Rotterdam developed from a small fishing vill ...
Linepithema humile; active ingredients; ant colonies; ant control; bifenthrin; concrete; economic sustainability; fipronil; insecticide residues; irrigation; laboratory experimentation; nests; pheromones; pyrethrins; rain; sediments; urban areas; waterways
Abstract:
... Outdoor residual sprays are among the most common methods for targeting pestiferous ants in urban pest management programs. If impervious surfaces such as concrete are treated with these insecticides, the active ingredients can be washed from the surface by rain or irrigation. As a result, residual sprays with fipronil and pyrethroids are found in urban waterways and aquatic sediments. Given the a ...
... Anthropogenic surficial deposits are formed from Holocene and older deposits that have been so modified by human activity that their original form is unrecognizable. Because their characteristics are fundamentally different from those of natural origin, the creation of special stratigraphic categories seems justified. Two new material categories are proposed for the stratigraphic classification of ...
concrete; drainage; pavements; pollutants; sediments; stormwater; surface area
Abstract:
... Permeable interlocking concrete pavements (PICP) are specifically designed to remove sediment and other pollutants from stormwater runoff. Over time, this can lead to clogging of the PICP system. Previous research has shown that much of the clogging occurs on the bedding aggregate directly below the paving joints, while the remainder of the aggregate is unaffected. This paper describes a proof of ...
Batuk Olga N.; Conradson Steven D.; Aleksandrova Olga N.; Boukhalfa Hakim; Burakov Boris E.; Clark David L.; Czerwinski Ken R.; Felmy Andrew R.; Lezama-Pacheco Juan S.; Kalmykov Stepan N.; Moore DeanA.; Myasoedov Boris F.; Reed Donald T.; Reilly Dallas D.; Roback Robert C.; Vlasova Irina E.; Webb Samuel M.; Wilkerson Marianne P.
... The speciation of U and Pu in soil and concrete from Rocky Flats and in particles from soils from Chernobyl, Hanford, Los Alamos, and McGuire Air Force Base and bottom sediments from Mayak was determined by a combination of X-ray absorption fine structure (XAFS) spectroscopy and X-ray fluorescence (XRF) element maps. These experiments identify four types of speciation that sometimes may and other ...
... River incision into bedrock drives the topographic evolution of mountainous terrain and may link climate, tectonics, and topography over geologic time scales. Despite its importance, the mechanics of bedrock erosion are not well understood because channel form, river hydraulics, sediment transport, and erosion mechanics coevolve over relatively long time scales that prevent direct observations, an ...
... Roadside soils are heavily loaded with reactive nitrogen due to vehicular emissions, and these loadings likely acidify near-road soils. Cationic metals are mobilized from acidified soils during exchange reactions. Depletion of soil cation pools is well documented in forest soils, but poorly understood in roadside soils despite heavy nitrogen loadings to roadside environments and the continued grow ...
acoustics; case studies; coasts; concrete; earthquakes; engineering; equipment; fish; friction; landslides; sediments; surveys; turbulent flow; Japan
Abstract:
... We investigated submerged ruins from the 1923 Nebukawa landslide, which was caused by the 1923 Kanto earthquake. The on-land areas affected by the landslide have been restored and evidence of the landslide is mostly gone, but huge structures that appear to be man-made have been observed by divers on the seafloor near the area of the landslide. We used a fish finder designed for leisure use and oth ...
... High concentrations of iron (Fe(II)) and manganese (Mn(II)) reductively dissolved from soil minerals have been detected in groundwater monitoring wells near many municipal solid waste landfills. Two in situ permeable reactive barriers (PRBs), comprised of limestone and crushed concrete, were installed downgradient of a closed, unlined landfill in Florida, USA, to remediate groundwater containing h ...
... The sulfate evaporite minerals (gypsum and anhydrite) and brines of Jizan sabkha cause corrosion of the steel reinforcement and deterioration of the concrete, and consequently hinder the development activity for building new urban communities and industrial zones in Jizan area, Red Sea coastal plain of Saudi Arabia. The sabkha evaporite minerals below the sediment surface are represented by displa ...
bitumen; cleaning; concrete; infiltration rate; milling; pavements; permeability; sediments; stormwater; washing; water quality; Sweden; United States
Abstract:
... The surface infiltration rates (SIR) of permeable pavements decline with time as sediment and debris clog pore spaces. Effective maintenance techniques are needed to ensure the hydraulic functionality and water quality benefits of this stormwater control. Eight different small-scale and full-scale maintenance techniques aimed at recovering pavement permeability were evaluated at ten different perm ...
aerial photography; aerial surveys; concrete; data collection; drainage; floods; lidar; mass movement; monitoring; ravines; scanners; sediments; semiarid zones; summer; water; water erosion; watersheds; Arizona
Abstract:
... Gullies that terminate at a vertical-wall are ubiquitous throughout arid and semiarid regions. Multi-year assessments of gully evolution and headcut advance are typically accomplished using traditional ground surveys and aerial photographs, with much recent research focused on integrating data collected at very high spatial resolutions using new techniques such as aerial surveys with blimps or kit ...
X-radiation; X-ray diffraction; concrete; construction materials; electrical conductivity; fluorescence; heavy metals; mechanical properties; pH; permeability; recycling; sediments; soil; soil sampling; steel; Korean Peninsula
Abstract:
... We assessed the suitability of soil dredged from reservoirs as embankment material and investigated its physical and geochemical properties and strength parameters, as well as its environmental stability. The dredged soil samples were taken from the Ansung, Jechon, and Mulwang Reservoirs in Korea. To evaluate their environmental stability and geochemical properties, we examined their levels of hea ...
Margaritifera margaritifera; biodiversity; breeding programs; burrows; concrete; correlation; domestication; habitat destruction; juveniles; methodology; mussels; particle size; risk; rivers; sediments; silos; summer; total suspended solids; water temperature; Europe
Abstract:
... Biodiversity loss is a global problem with freshwater bivalves considered among the most endangered biota. The freshwater pearl mussel, Margaritifera margaritifera, is declining throughout its range owing to habitat degradation and overexploitation. In most of its range, populations are regarded as reproductively non‐functional, which has led to the development of captive breeding programmes. A no ...
United States Environmental Protection Agency; aqueous solutions; concrete; electric power; electrochemistry; electrodes; electrolysis; nickel; oxidation; pollutants; polycyclic aromatic hydrocarbons; residential housing; sediments; sodium chloride; soil; stainless steel; wastewater
Abstract:
... Polycyclic aromatic hydrocarbons (PAH) have been listed by the United States Environmental Protection Agency (US EPA) and by the European Community as priority environmental pollutants. The removal of PAHs from soils, sediments and waste water has attracted attention of scientists and engineers for several decades. Electrochemical oxidation of PAH compounds in water, is receiving increasing attent ...
... Solidification is a very effective way to alleviate heavy metal impacts to the environment. In this paper, an improved method was adopted herein for the solidification/stabilization (S/S) of sediments with cement-based additives and low content of cement in S/S materials. Sediments in Xiangjiang River, containing high concentrations of Cu, Cd, and Pb, were solidified/stabilized by binders of cemen ...
chemical analysis; concrete; culverts; iron oxides; landscapes; mountains; runoff; sediment yield; sediments; soil erosion; soil water; streams; topographic slope; vegetation; water repellent soils; watersheds; wildfires; Italy
Abstract:
... In this study we document a post-fire erosion response to a short-lived, intense rainstorm occurred on 6 September 2012 in the Sant'Angelo creek watershed, Sarno Mountains, Southern Italy. The rainstorm occurred one month after a wildfire that burned about 11ha of the steep watershed (55ha), almost entirely mantled by volcaniclastic deposits. The research was based on fieldwork and laboratory anal ...
biomass; byproducts; cement; compression strength; concrete; construction materials; dry milling; fly ash; incinerators; pollutants; raw materials; sediments; sodium hydroxide; watersheds
Abstract:
... Sediment, often considered a by-product of various activities within river basin management to be disposed of, or a pollutant to be controlled, is increasingly being acknowledged as a resource in need of management. The paper deals with the possibility of reusing sediment from two Slovak reservoirs (Klusov and Ruzin) as an alternative raw material in concrete production. Concrete specimens were pr ...
clay; coastal plains; coasts; concrete; deforestation; human development; humans; resorts; river deltas; rivers; sea level; sediments; stream channels; subsidence; tourists; wetlands; wood; China; Japan; Yellow River
Abstract:
... Since the Neolithic, humans have gathered along coastal plains, where they had to face sea level rise and subsidence without the technology to oppose these processes. When sea level stabilized, approx. 6.000 yr. B.P., coastal colonization was allowed, but where mountain deforestation was carried out river sediment input increased tremendously: settlements were disconnected from the shore and harbo ...
... Seawalls made from rock and concrete are engineered to defend coastlines and infrastructure from sea level rise, storm surge and shoreline erosion. However, while they provide a poor substitute for natural intertidal habitat, emerging designs addressing this biodiversity deficit have incorporated eco-engineering concepts with promising results. This study tested whether adding inexpensive househol ...
... Some current‐use pesticides are chiral and have nonsuperimposable mirror images called enantiomers that exhibit identical physical–chemical properties but can behave differently when in contact with other chiral molecules (e.g., regarding degradation and uptake). These differences can result in variations in enantiomer presence in the environment and potentially change the toxicity of pesticide re ...
... Little is known about the ecological impacts of oyster culture structures on intertidal communities. In the present study, distribution and movement patterns of juvenile Chinese horseshoe crab, Tachypleus tridentatus were assessed on a mudflat at Ha Pak Nai in Deep Bay, Hong Kong. As the traditional bottom‐laying method of using concrete posts as cultch for collecting oyster spat is a common pract ...
... Porous mixtures and Interlocking Concrete Block Pavements (ICBP) are the most widely used surfaces in Permeable Pavement Systems (PPS). Despite the fact that there are many studies based on the hydrological performance of PPS, there are few long-term studies that identify the end of life of PPS regarding their hydrological performance. A field study has been developed over 10 years in the experime ...
... The most distinguished characteristic of pervious concrete is its connected porosity that allows water to percolate. And the permeable capacity will decrease rapidly once the pervious concrete is clogged by the sediments. Despite the relationship between permeability and clogging is extensively researched, there is limited information about pore clogging mechanism in pervious pavements. The aim of ...
... Urban road surface roughness is one of the most important factors in estimation of surface runoff loads caused by road-deposited sediment (RDS) wash-off and design of its control measures. However, because of a lack of experimental data to distinguish the role of surface roughness, the effects of surface roughness on RDS accumulation and release are not clear. In this study, paired asphalt and con ...
... Recruitment success in sessile benthic invertebrates that produce pelagic larvae is an emergent property of larval supply, settlement rates, and post-settlement survival. While intuitive that larval supply and settlement rates should be positively correlated, previous studies have demonstrated that many factors, such as competition for limited space on hard substrata, may decouple this relationshi ...
... Many erosion control techniques, such as stone pitching, concrete revetment, and geotextile covering, have been effective at protecting cut slopes along roads or railways. However, these methods are expensive and hard to operate for high stairstep cut-slopes. To investigate the efficiency of several easily implemented and low-cost techniques, five plots with different treatments were built on stai ...
... Variability of background concentration of toxic trace metal(loid)s in sediments can often lead to under/over-report of contamination level, even in detailed scale. In this study, both surface (5–10 cm) and subsurface (> 10 cm) sediments were collected at many sites in a small lake (0.528 km²) with multi-function (irrigation, aquaculture, and watercourse) in an industrial area. Total concentration ...
concrete; dams (hydrology); rivers; sediments; shrews; streams; surveys; Japan
Abstract:
... The concrete walls of check dams are considered a physical barrier for aquatic and semiaquatic animals that inhabit mountain streams. Traveling behaviors around concrete check dams by the Japanese water shrew Chimarrogale platycephalus, a semi-aquatic mammal, were directly observed via radio-tracking in Kamikoshi Stream in central Honshu, Japan. Traveling behaviors were mainly observed on the wet ...
case studies; concrete; drainage channels; farmers; landscapes; mathematical theory; roads; sediment transport; sediments; soil erosion; vines; vineyards; watersheds; wines; France
Abstract:
... In agricultural lands, assessing how the spatial patterns of landscapes affect sediment connectivity is a key factor in understanding the nonlinear behavior of sediment transfer to the outlet. Important questions remain regarding this relationship. For example, to what extent is sediment travel disconnected from the flows that transport sediments? What connections exist between the components of t ...
agriculture; carbon nitrogen ratio; concrete; control methods; ecosystems; emissions; environment; homeostasis; leaves; nutrient content; nutrients; paddies; pollutants; pollution; pollution control; rice; runoff; sediments; soil ecology; stoichiometry; total nitrogen; total organic carbon; total phosphorus
Abstract:
... Nutrient emissions from paddy fields are one of the main sources of agricultural non-point source (NPS) pollution. Based on the “4R” (Reduce-Retain-Reuse-Restore) strategical system of agricultural NPS pollution control, ecological ditches are effective control measures under the “Retain” system. In this study, the nutrient removal efficiency and stoichiometric variations in three different ecolog ...
... Permeable pavement has the potential to be an effective tool in managing stormwater runoff through retention of sediment and other contaminants associated with urban development. The infiltration capacity of permeable pavement declines as more sediment is captured, thereby reducing its ability to treat runoff. Regular restorative maintenance practices can alleviate this issue and prolong the usefu ...
... Urbanisation leaves a geochemical signature on the environment, as weathering of urban materials such as concrete contributes to elevated levels of major ions including calcium, bicarbonate and potassium. However, there is limited research that addresses the ecological consequences of this signature on the biotic community. Blue Mountains Upland Swamps (BMUS), an endangered ecological community wi ...
... Recently, many mountain disasters caused by natural phenomena, such as typhoons and heavy rains, have struck Japan, where check dams are used as important disaster prevention structures. Meanwhile, increased timber use in Japan is expected to revitalize regional economies, thus drawing attention to the use of timber in check dams. However, comparisons between timber and concrete check dams, in ter ...
Stefanie Eichinger; Ronny Boch; Albrecht Leis; Günther Koraimann; Cyrill Grengg; Gunnar Domberger; Manfred Nachtnebel; Christian Schwab; Martin Dietzel
... Rapid deposition of chemical sediments, particularly calcium carbonate, is a widespread phenomenon in tunnel constructions, which can significantly disturb water draining. The removal of the scale deposits in the drainage setting is labor and cost intensive. Prediction or prevention of these unwanted scale deposits are challenging and require detailed knowledge on their site-specific source, forma ...
... Two abandoned kaolin mines, surrounding one of the most outstanding natural parks of Spain, the Alto Tajo, have caused frequent environmental impacts. Within these are unstable areas prone to extensive mass movements that influence off-site sediment dynamics over the fluvial system. A waste dump in the Nuria mine obstructing a stream in the center of a valley experienced a rotational landslide. Ma ...
... Large quantities of contaminated river sediment is dredged continuously worldwide, which is generally dumped in landfill areas resulting in land occupation and soil-groundwater pollution. An innovative approach is demonstrated in this study to transform contaminated sediment into eco-friendly foamed concrete by adding cement, foam and silica fume without heating and pressure. With the foam percent ...
... Several studies have proven the use of dredged sediments as supplementary cementitious materials (SCMs), but limited information is available on the effect of such treated sediments on self-consolidating concrete performance. The main objective of this study was to evaluate the performance of self-consolidating concrete (SCC) fabricated with treated sediments. The sediments were thermally treated ...
... The pores of pervious concrete pavement will be clogged by sediment carried by rainwater runoff and atmospheric deposition on the pavement in the course of using, thus reducing the permeability of pavement. It is necessary to adopt effective maintenance measures to keep the permeability of the pavement. In this study, an improved single ring infiltrometer is used to measure the permeability of a n ...
assets; biochemical pathways; biofilm; bioreactors; concrete; gravity; infrastructure; plankton; pollution; sediments; wastewater; wastewater treatment; water flow; Western European region
Abstract:
... Sewer systems are an integral part of our modern civilization and are an imperative underground infrastructure asset that our society relies on. In Western Europe alone, 92% of the resident pollution is connected to sewer systems. This extensive coverage of sewerage systems presents an ideal habitation for microorganisms to strive. Sewers can be considered continuous flow bioreactors. They are alw ...
... Environmental and ecological issues have led to the development of new sustainable channels for the recovery of dredged sediments. One of the major difficulties of sediment valorization lies in particular in its very heterogeneous composition. For example, the presences of heavy metals and organic matter have a significant influence on the environmental impact of materials formulated with sediment ...
... Routine waterway dredging activities generate huge volumes of dredged sediment. The remediation of dredged contaminated sediment is a worldwide challenge. Novel and sustainable ex-situ remediation technologies for contaminated sediment have been developed and adopted in recent years. In this review paper, the state-of-art ex-situ treatment technologies and resource utilisation methods for contamin ...
... Ultra-lightweight foamed alkali-activated concrete based on river sediment-metakaolin blends was prepared by the mixed foaming method of chemical foaming. Polluted river sediment is transformed into eco-friendly foamed concrete without heating and pressure. The results showed that ultra-lightweight foamed concrete presented its dry density between 100 and 600 kg/m³, the thermal conductivity betwee ...
... Recycling of dredged sediment (DS), derived from the routine dredging operation of rivers, lakes and seas, into construction materials represents an eco-friendly way to alleviate the burden on the environment. At higher incorporation dosages, however, DS causes a dramatic reduction in the mechanical properties of the host materials, which greatly stymies a broader application. In this study, DS fr ...