1D modelling of fine sediments dynamics in a dam reservoir during a flushing event

2014 ◽  
pp. 159-166 ◽  
Keyword(s):  
Dam Reservoir ◽  
Fine Sediments ◽  
1D Modelling

Danube Field Excursion 1988: Tritium Content of River Water; Radioactivity of Danube Sediments

1990 ◽  
Vol 22 (5) ◽  
pp. 203-210 ◽  
Author(s):  
D. Rank ◽  
F. J. Maringer ◽  
W. Papesch ◽  
V. Rajner
Keyword(s):  
River Water ◽  
Bottom Sediments ◽  
Nuclear Power ◽  
Radioactive Material ◽  
Reactor Accident ◽  
Tritium Content ◽  
Fine Sediments ◽  
Fish Samples ◽  
Field Excursion

Water, sediment, and fish samples were collected during the Danube excursion 1988, within a coordinated sampling program of the Radiology Working Group of the “Internationale Arbeitsgemeinschaft Donauforschung ” (K.Hübel, Munich; I. Kurcz, Budapest; D.Rank, Vienna). The H-3 content of the river water and the radioactivity of the bottom sediments were measured at the BVFA Arsenal, Vienna. The determined H-3 content of the Danube water corresponds with the long-term trend in the H-3 content of the hydrosphere; the values lie in the range of 3 Bq/kg downstream from Belgrade, upstream from Belgrade they are about 4 Bq/kg. It was only in the waste water plume of the nuclear power station of Kozloduj that a slightly elevated H-3 value - 6 Bq/kg - was determined. The content of the sediments of artificial radionuclides was found, at the time of the Danube field excursion, to be almost exclusively due to the radioactive material released following the reactor accident at Chernobyl in April 1986 (mainly Cs-137 and Cs-134). As a consequence of the air currents and precipitation conditions prevailing at the time of the accident, the bottom sediments in the lower course of the Danube were less contaminated than those in the upper course. The fine sediments were found to contain over 3000 Bq/kg of Cs-137 in the upper course of the Danube.

HYDRODYNAMIC STRUCTURE IN A LARGE DAM RESERVOIR DURING EARLY AUTUMN

2018 ◽  
Vol 74 (5) ◽  
pp. I_481-I_486
Author(s):  
Makoto UMEDA ◽  
Yuta NAITO ◽  
Bunyu KOBORI ◽  
Tetsuya SHINTANI ◽  
Kazushi OMOE ◽  
...  
Keyword(s):  
Dam Reservoir ◽  
Early Autumn ◽  
Hydrodynamic Structure ◽  
Large Dam

Effects of riparian forest thinning by two types of mechanical harvest on stream fish and habitat in northern Minnesota

2008 ◽  
Vol 38 (2) ◽  
pp. 247-256 ◽  
Author(s):  
Nathaniel A. Hemstad ◽  
Eric C. Merten ◽  
Raymond M. Newman
Keyword(s):  
Repeated Measures ◽  
Riparian Forest ◽  
Canopy Cover ◽  
Stream Habitat ◽  
North Central ◽  
Fine Sediments ◽  
Repeated Measures Analysis ◽  
Stream System ◽  
Tree Length ◽  
Wide Scale

The response of fish communities and stream habitat to four riparian harvest treatments was studied in north-central Minnesota to determine if riparian harvest with two different harvest systems degrades stream systems. Treatments included control (no harvest), riparian control, cut-to-length riparian thin, and tree length riparian thin. Fish and habitat data were collected from 50 m reaches above, within, and downstream of each treatment 1 year preharvest (1997) and 3 years postharvest (1998–2000). Repeated measures analysis revealed few effects due to treatment; however, there was a 6%–10% significant reduction in canopy cover. Percent fine sediments increased significantly (15%) system-wide following forest harvest and persisted through 2000. This increase in fine sediments was correlated with a decrease in fish biotic integrity (r = –0.31). Habitat and fish variables were influenced more by year-to-year variation than by harvest treatment, suggesting that factors operating at a broader basin-wide scale may influence fish and habitat or mask any site-level harvest effects in this low-gradient stream system. Residual riparian basal areas ≥12.3m2/ha along reaches ≤200 m in length may be adequate to protect fish and habitat in these low-gradient streams, but basin-wide effects of harvest deserve more scrutiny.

scholarly journals Statistical Modeling of Fine Sediments Dredged Using a Variable Area Dredging Suction Head to Improve Water Quality

Hydrology ◽  
2021 ◽  
Vol 8 (3) ◽  
pp. 98
Author(s):  
Leigh A. Provost ◽  
Robert Weaver ◽  
Nezamoddin N. Kachouie
Keyword(s):  
Climate Change ◽  
Water Quality ◽  
Sedimentation Rates ◽  
Agricultural Lands ◽  
Design Efficiency ◽  
Fine Sediments ◽  
Grain Sizes ◽  
Fine Grain ◽  
Sediment Sampling ◽  
Improve Water Quality

The changing climate affects the agricultural lands, and, in turn, the changes in agricultural lands alter the watershed. A major concern regarding waterbodies is the increased sedimentation rates due to climate change. To improve the water quality, it is crucial to remove fine sediments. Using current environmental dredging methods is challenging because of the sediment volumes that must be dredged, the absence of nearby disposal sites, and the shoreline infrastructure at the dredging locations. To address these issues, we used a surgical dredging method with a variable area suction head that can easily maneuver around the docks, pilings, and other infrastructures. It can also isolate the fine grain material to better manage the dredged volumes in the seabed where nutrients are typically adhered. To this end, a statistical analysis of the dredged samples is essential to improve the design efficiency. In this work, we collected several samples using a variable area suction head with different design settings. The collected samples using each design setting were then used to model the distributions of the different grain sizes in the dredged sediments. The proposed statistical model can be effectively used for the prediction of sediment sampling outcomes to improve the gradation of the fine sediments.

Water length and height effects on the earthquake behavior of arch dam-reservoir-foundation systems

2011 ◽  
Vol 15 (2) ◽  
pp. 295-303 ◽  
Author(s):  
Bariş Sevim ◽  
Ahmet Can Altunsşik ◽  
Alemdar Bayraktar ◽  
Mehmet Akköse ◽  
Yusuf Calayir
Keyword(s):  
Arch Dam ◽  
Dam Reservoir

scholarly journals Recycling and Reuse of Sediments in Agriculture: Where Is the Problem?

2021 ◽  
Vol 13 (4) ◽  
pp. 1648
Author(s):  
Giancarlo Renella
Keyword(s):  
Scientific Evidence ◽  
Significant Proportion ◽  
Silty Clay ◽  
Fine Sediments ◽  
Sediment Fraction ◽  
Biodegradation Process ◽  
Component Material ◽  
Long Time ◽  
Clay Sediment ◽  
International Conventions

Though suggested by international conventions for a long time, there are still several technical and legislative limitations to a complete reuse and recycling of dredged sediments. In particular, reuse of unpolluted sediments can be practiced, whereas sediment recycling is still affected by several downsides, and a significant proportion of the recycled fine sediments has no practical use and must be landfilled. However, the silty clayey fraction of the recycled sediments is rich in organic matter and macro- and micronutrients useful for plant growth. Nevertheless, sediment recycling in agriculture is not possible, even in non-food agricultural sectors, due to the lack of a permissive legislation and of consolidated supply chains. In addition to plant nutrients, the silty-clay sediment fraction may also accumulate organic and inorganic pollutants, and while the organic pollutants can be effectively biodegraded, metals and metalloids may concentrate at concentrations higher than the limits set by the environmental and agricultural legislations. In this paper, I briefly summarize the scientific evidence on the potential reuse and recycling of sediments in agriculture, and I discuss the main reasons for hindrance of sediment recycling in agriculture. I also present evidence from a real industrial biodegradation process that produces bioremediated fine sediment fractions with suitable properties as a mineral ingredient for plant-growing media. I propose that nutrient-rich recycled sediments could be reconsidered as a component material category in the new EU regulation on fertilizers.

scholarly journals THE INVESTIGATION INTO THE LAND CONDITION OF KASEGAWA DAM RESERVOIR BASIN BY USING THE REMOTE-SENSING DATA AND THE ESTIMATE OF ITS SEDIMENT YIELD VOLUME

2001 ◽  
Vol 45 ◽  
pp. 805-810
Author(s):  
Haruyuki HASHIMOTO ◽  
Katsutoshi WATANABE ◽  
Byungdug JUN ◽  
Kenji UENO ◽  
Minoru YAMANAKA ◽  
...  
Keyword(s):  
Remote Sensing ◽  
Sediment Yield ◽  
Remote Sensing Data ◽  
Dam Reservoir ◽  
Sensing Data ◽  
Land Condition ◽  
Reservoir Basin

scholarly journals Investigation of Vertical Migration of Blue-Green Algae in Stratified Dam Reservoir

2012 ◽  
Vol 35 (9) ◽  
pp. 151-157
Author(s):  
Shingo MASUKI ◽  
Kenichi WAKABAYASHI ◽  
Satoru TAKAHASHI ◽  
Hiroshi BESSYO ◽  
Kuniaki TOSHIMA ◽  
...  
Keyword(s):  
Green Algae ◽  
Vertical Migration ◽  
Dam Reservoir ◽  
Blue Green Algae
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