scholarly journals Long-term dynamics of the concentrations of organochlorine compounds and mercury in the sediments of the Сhernorechenskoe reservoir

2019 ◽  
Vol 46 (4) ◽  
pp. 417-423
Author(s):  
L. V. Malakhova ◽  
V. N. Egorov ◽  
S. B. Gulin ◽  
T. V. Malakhova ◽  
I. N. Moseychenko
Keyword(s):  
Spatial Distribution ◽  
Sedimentation Rate ◽  
Total Mercury ◽  
Organochlorine Compounds ◽  
Historical Reconstruction ◽  
Reservoir Sediment ◽  
Deposition Rates ◽  
Reservoir Sediments ◽  
Reservoir Volume

The accumulation of organochlorine compounds (OCs) and mercury in the sediments of the Chernorechenskoe Reservoir since the mid-1960s to 2008 has been studied. Sedimentation rate and accumulation chronology of recovered sediments were reconstructed by the method of radioisotope dating . The sedimentation rate in the reservoir has been found to vary because of changes in reservoir volume and area in the late 1980s. Historical reconstruction of the input of OCs and mercury into the reservoir sediments in the recent 50 years has been performed. The period of 1950–1960 has been found to show considerable pollution of reservoir sediment by DDT and mercury. The spatial distribution of OCs and mercury has been determined in the top 5-cm layer of sediments in the Chernorechenskoe Reservoir. The deposition rates of OCs and total mercury into sediments in 2008 have been evaluated.

scholarly journals Long-Term Management Policies of Reservoirs: Possible Re-Use of Dredged Sediments for Coastal Nourishment

Water ◽  
2018 ◽  
Vol 11 (1) ◽  
pp. 15 ◽  
Author(s):  
Annamaria De Vincenzo ◽  
Carmine Covelli ◽  
Antonio Molino ◽  
Marilena Pannone ◽  
Margherita Ciccaglione ◽  
...  
Keyword(s):  
Methodological Approach ◽  
Beach Sand ◽  
Coastal Protection ◽  
Quantitative Characterization ◽  
Reservoir Sediment ◽  
Reservoir Sediments ◽  
Management Policies ◽  
Term Management

This paper proposes a methodological approach to the re-use of reservoir sediments for coastal nourishment. The proposed approach represents a point of convergence between water and sediment management, coastal protection from erosion and the re-use of sediments dredged from reservoirs. In particular, this study indicates a general protocol of actions and a reference legislative scenario for the use of sediment from reservoirs for beach nourishment as an alternative to sediment from sea caves or land caves. Quantitative characterization of reservoir sediments and their qualitative characterization are the fundamental steps to define the compatibility between reservoir sediment and beach sand. The study was applied to a real case of Southern Italy known as the Guardialfiera Reservoir.

Modelling the Effects of Acid Deposition: Estimation of Long-Term Water Quality Responses in Forested Catchments in Finland

1988 ◽  
Vol 19 (2) ◽  
pp. 99-120 ◽  
Author(s):  
A. Lepistö ◽  
P. G. Whitehead ◽  
C. Neal ◽  
B. J. Cosby
Keyword(s):  
Water Quality ◽  
Surface Water ◽  
Base Cations ◽  
Surface Water Quality ◽  
Mineral Weathering ◽  
Co2 Solubility ◽  
Forested Catchments ◽  
Deposition Rates ◽  
Magic Model

A modelling study has been undertaken to investigate long-term changes in surface water quality in two contrasting forested catchments; Yli-Knuutila, with high concentrations of base cations and sulphate, in southern Finland; and organically rich, acid Liuhapuro in eastern Finland. The MAGIC model is based on the assumption that certain chemical processes (anion retention, cation exchange, primary mineral weathering, aluminium dissolution and CO2 solubility) in catchment soils are likely keys to the responses of surface water quality to acidic deposition. The model was applied for the first time to an organically rich catchment with high quantities of humic substances. The historical reconstruction of water quality at Yli-Knuutila indicates that the catchment surface waters have lost about 90 μeq l−1 of alkalinity in 140 years, which is about 60% of their preacidification alkalinity. The model reproduces the declining pH levels of recent decades as indicated by paleoecological analysis. Stream acidity trends are investigated assuming two scenarios for future deposition. Assuming deposition rates are maintained in the future at 1984 levels, the model indicates that stream pH is likely to continue to decline below presently measured levels. A 50% reduction in deposition rates would likely result in an increase in pH and alkalinity of the stream, although not to estimated preacidification levels. Because of the high load of organic acids to the Liuhapuro stream it has been acid before atmospheric pollution; a decline of 0.2 pH-units was estimated with increasing leaching of base cations from the soil despite the partial pH buffering of the system by organic compounds.

Long-term changes in spatial distribution of birds responding to a group-selection timber harvest

2012 ◽  
Vol 36 (2) ◽  
pp. 313-327 ◽  
Author(s):  
Steven P. Campbell ◽  
Jack W. Witham ◽  
Malcolm L. Hunter
Keyword(s):  
Spatial Distribution ◽  
Group Selection ◽  
Timber Harvest ◽  
Long Term Changes

Long-term modeling of phosphorus spatial distribution in the no-tilled soil profile

2019 ◽  
Vol 187 ◽  
pp. 119-134 ◽  
Author(s):  
Haixiao Li ◽  
Alain Mollier ◽  
Noura Ziadi ◽  
Aimé Jean Messiga ◽  
Yichao Shi ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Soil Profile

scholarly journals SPATIAL DISTRIBUTION OF THE FAUNA OF THE SOIL ON THE LONG-TERM SYSTEM OF DIRECT SOWING

2017 ◽  
Vol 2 (2) ◽  
pp. 16
Author(s):  
Jessica Zuanazzi Fioritti Corbo ◽  
Glécio Machado Siqueira ◽  
Sidney Rosa Vieira
Keyword(s):  
Spatial Distribution ◽  
Direct Sowing

scholarly journals Spatial Analysis of Seasonal Precipitation Using Various Interpolation Methods in the Euphrates Basin, Turkey

2021 ◽  
Author(s):  
Okan Mert Katipoğlu
Keyword(s):  
Spatial Distribution ◽  
Geographical Information Systems ◽  
Polynomial Interpolation ◽  
Estimation Method ◽  
Summer Precipitation ◽  
Winter Precipitation ◽  
Geographical Information ◽  
Seasonal Precipitation ◽  
Interpolation Methods

Abstract It is vital to accurately map the spatial distribution of precipitation, which is widely used in many fields such as hydrology, climatology, meteorology, ecology, and agriculture. In this study, it was aimed to reveal the spatial distribution of seasonal long-term average precipitation in the Euphrates Basin by using various interpolation methods. For this reason, Simple Kriging (SK), Ordinary Kriging (OK), Universal Kriging (UK), Ordinary CoKriging (OCK), Empirical Bayesian Kriging (EBK), Radial Basis Functions (Completely Regularized Spline (CRS), Thin Plate Spline (TPS), Multiquadratic, Inverse Multiquadratic (IM), Spline with Tensor (ST)), Local Polynomial Interpolation (LPI), Global Polynomial Interpolation (GPI), Inverse Distance Weighting (IDW) methods have been applied in the Geographical Information Systems (GIS) environment. Long-term seasonal precipitation averages between 1966 and 2017 are presented as input for the prediction of precipitation maps. The accuracy of the precipitation prediction maps created was based on root mean square error (RMSE) values obtained from the cross-validation tests. The method of precipitation by interpolation yielding the lowest RMSE was selected as the most appropriate method. As a result of the study, OCK in spring and winter precipitation, LPI in summer precipitation, and OK in autumn precipitation were determined as the most appropriate estimation method.

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