Spatial distribution of water-mobilizable colloids and phosphorus from dam reservoir sediment 

2021 ◽  
Author(s):  
Ngoc Diep Nguyen ◽  
Malgorzata Grybos ◽  
Marion Rabiet ◽  
Véronique Deluchat
Keyword(s):  
Sediment Resuspension ◽  
Ecological Problem ◽  
Dam Reservoir ◽  
Reservoir Sediment ◽  
Sampling Campaign ◽  
Sediment Mass ◽  
Dam Reservoirs ◽  
Phosphorus Form ◽  
P Fraction ◽  
Intrinsic Component

<p>The hydrodynamics of dam reservoirs favor the accumulation of phosphorus (P) in bottom sediments since it has a strong affinity for the sedimentary particles. However mechanical disturbance of sediment (resuspension) may release P back to water column. The load of sedimentary P poses a serious ecological problem related to the maintaining of water eutrophication. The aim of this study was to evaluate the potential of sediments, accumulated in Champsanglard reservoir (Central France), to release water-mobilizable colloidal and dissolved P. A sampling campaign was carried out at different locations along the main channel of reservoir from riverine to lacustrine area and characterized by different hydrodynamics. The results showed that colloids are intrinsic component of reservoir sediment and contribute up to 2.3% of sediment mass. Colloidal P attributed up to 6% of total sedimentary P and 80% of water-mobilizable P (fraction < 1 µm). The stock of water-mobilizable colloids and associated P varied according to particle size distribution and was strongly dependent to channel morphology, hydrodynamics and inlet of tributary.</p><p><strong>Keywords: </strong>Dam reservoir, sedimentary colloids, phosphorus form, spatial variability</p>

scholarly journals The Orava dam reservoir – an important site of aquatic molluscs in north-western Slovakia

2021 ◽  
Vol 29 (2) ◽  
pp. 111-116
Author(s):  
Luboš Beran
Keyword(s):  
Dam Reservoir ◽  
Anodonta Cygnea ◽  
Physa Acuta ◽  
Dam Reservoirs ◽  
Mollusc Species ◽  
Littoral Vegetation ◽  
Mollusc Assemblages ◽  
Radix Auricularia ◽  
First Time ◽  
North Western

Mollusc assemblages of the Orava reservoir, the biggest dam reservoir in Slovakia, were studied in 2020. The reservoir, built in 1941–1953, is situated in north-western Slovakia. Sixteen aquatic mollusc species (13 gastropods, 3 bivalves) were recorded. Valvata piscinalis (O. F. Müller), Radix auricularia (Linnaeus) and Gyraulus parvus (Say) were the most frequent; they were recorded in more than ten sites each. Rich mollusc assemblages, composed mainly of gastropods, were found in sites with rich littoral vegetation of macrophytes. The bivalve diversity and abundance were very small, especially compared to the other studied dam reservoirs. The current results were compared with the previous surveys. The occurrence of Radix lagotis (Schrank) is its first reliable record in Slovakia. Viviparus acerosus (Bourguignat), Aplexa hypnorum (Linnaeus), Anodonta cygnea (Linnaeus), non-native Potamopyrgus antipodarum (Gray) and Physa acuta (Draparnaud) were recorded in this area for the first time and their sites are outside their known range in Slovakia.

scholarly journals The development of the eutrophication process in Dobczyce reservoir

2018 ◽  
Vol 45 ◽  
pp. 00055 ◽  
Author(s):  
Elena Neverova-Dziopak ◽  
Zbigniew Kowalewski
Keyword(s):  
Surface Waters ◽  
Aquatic Ecosystems ◽  
Trophic Status ◽  
Low Cost ◽  
State Assessment ◽  
Dam Reservoir ◽  
Dam Reservoirs ◽  
Abatement Strategies ◽  
Global Threat ◽  
Primary Problem

Eutrophication is currently a global threat to all types of aquatic ecosystems leading to a disturbance of their ecological balance and a deterioration of water quality. This problem is especially true for dam reservoirs, which play a key role in the economy of each country, being an important source of water supply. It is also a primary problem for all types of surface waters in Poland. Effective eutrophication abatement strategies should be based on reliable information about the actual trophic status of waters which in turn should be obtained with fast, accurate and low-cost monitoring. The aim of this paper is to investigate the possibility of the application of aggregated numerical indicators as an effective tool for the assessment of water trophic status and prove it using the example of the trophic state assessment of the Dobczyce dam reservoir. For this purpose, three numerical indicators elaborated by different authors were used.

scholarly journals Hydrology Properties At Sembrong Dam Reservoir in Johor

2015 ◽  
Vol 773-774 ◽  
pp. 1330-1334
Author(s):  
Halizah Awang ◽  
Zawawi Daud ◽  
Lai Wai Tan ◽  
Mohd Zainuri Mohd Hatta
Keyword(s):  
Flood Hazard ◽  
Treatment Plant ◽  
Flood Frequency ◽  
Flood Frequency Analysis ◽  
Balance Model ◽  
Main Function ◽  
Sources Of Information ◽  
Dam Reservoir ◽  
Dam Reservoirs ◽  
The Right

Water is fresh potable water is not always available at the right time or the right place for human or ecosystem use [1]. According to Straskraba and Tundisi (1999), water impoundments constructed by damming rivers are called dam reservoirs. Under the Malaysian Western Johore Agricultural Development Project, the main function of the Sembrong dam is flood mitigation. The secondary function of the dam is to provide clean water supply to 240,000 consumers in Kluang district area [2]. Water from the Sembrong dam reservoir is treated at the West Sembrong Water Treatment Plant before the distribution. Daily reservoir inflow data were extracted by applying the water balance model to the Sembrong dam reservoir. Developing hydrologic hazard curves for risk assessment uses the length of record and type of data to determine the extrapolation limits for flood frequency analysis [5]. Extrapolation beyond the data is often necessary to provide information needed for dam safety risk assessments [6]. The sources of information used for flood hazard analyses include stream flow and precipitation records and pale flood data.

scholarly journals Long term evolution of a dam reservoir subjected to regular flushing events

2014 ◽  
Vol 39 ◽  
pp. 89-94 ◽  
Author(s):  
L. Guertault ◽  
B. Camenen ◽  
C. Peteuil ◽  
A. Paquier
Keyword(s):  
Data Processing ◽  
Morphological Evolution ◽  
Spatial Dynamics ◽  
Dam Reservoir ◽  
Reservoir Sediment ◽  
Volume Calculation ◽  
Bathymetric Data ◽  
Sediment Volume ◽  
Term Evolution

Abstract. An analysis of the long term morphological evolution of the Génissiat reservoir (France) is provided. First, a methodology for bathymetric data processing and reservoir sediment volume budget calculation is described. An estimation of global uncertainties in volume calculation is proposed. The reservoir bathymetric budget for several dam flushing events and interflush periods is presented, showing the global decrease of deposited sediment volume with time. The spatial dynamics of the reservoir subreaches is highlighted and typical patterns in flush and interflush periods are identified.

scholarly journals Landfill liners from dam reservoir sediments

2016 ◽  
Vol 48 (1) ◽  
pp. 41-52 ◽  
Author(s):  
Karolina Koś ◽  
Eugeniusz Zawisza
Keyword(s):  
Natural Environment ◽  
Cohesive Soils ◽  
Dam Reservoir ◽  
Geotechnical Parameters ◽  
Landfill Liners ◽  
Reservoir Sediments ◽  
Waste Landfill ◽  
Dam Reservoirs ◽  
Soil Liner

Abstract Landfill liners from dam reservoir sediments. Every municipal solid waste landfill has to be properly secured to protect the natural environment from possible leachate. Most often an artificial sealing is used, which is based on a soil liner from cohesive soils (clays, silts). Usability evaluation of bottom sediments from Rzeszowski Reservoir for building these liners was presented in the paper. Sediments from dam reservoirs, gathered as a result of the siltation process, can be a valuable material for earthworks purposes. Determination of their possible ways of usage is important, especially before the planned dredging, because thanks to that this material will not be put on a heap. Based on the analysis of the geotechnical parameters of these sediments it was stated that this material can be preliminary allowed for using in liners.

Analysis of plunging phenomenon in dam reservoirs using three-dimensional density flow simulations

2008 ◽  
Vol 35 (10) ◽  
pp. 1138-1151 ◽  
Author(s):  
Fatih Üneş
Keyword(s):  
Turbulence Model ◽  
Coriolis Force ◽  
Present Model ◽  
Three Dimensional ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Dam Reservoir ◽  
Reservoir Flow ◽  
Dam Reservoirs ◽  
Density Flow

Density flow is investigated in a three-dimensional model through a dam reservoir with diverging and sloping bottom channels. When an inflow of higher density enters ambient dam reservoir water, it plunges below the ambient water and becomes density underflow. In the present model, nonlinear and unsteady continuity, momentum, energy, and turbulence model equations are formulated in the Cartesian coordinates. The k–ε turbulence model is used with an extension to include production or destruction of turbulent kinetic energy. To investigate the Coriolis force effect on the density flow in a dam reservoir, a Coriolis force parameter is included in the governing equations. The equations of the model are solved based on the initial and boundary conditions of the dam reservoir flow for a range of bottom slopes and divergence angles. In this paper, variation in density flow parameters, such as velocity, temperature, and turbulence viscosity through the dam reservoir, is investigated. Moreover, mixing rate, plunging points, and plunging depths are determined from the simulation results. The results of the present model are compared with the previous experimental work and model. The present model results follow the expected basic trend. The three-dimensional model simulation and analysis improve the understanding of density flow, underflow, divergence flow, mass transport, and dam–reservoir flow interaction.

scholarly journals CONCEPTUAL MODEL FOR ASSESSING THE CHANNEL CHANGES UPSTREAM FROM DAM RESERVOIR

2014 ◽  
Vol 33 (1) ◽  
pp. 61-74 ◽  
Author(s):  
Maciej Liro
Keyword(s):  
Conceptual Model ◽  
Operation Mode ◽  
Sediment Supply ◽  
River Channels ◽  
Dam Reservoir ◽  
Channel Changes ◽  
Adjustment Time ◽  
Dam Reservoirs ◽  
Alluvial Channel ◽  
The Impact

Abstract Most of geomorphological studies related to the impact of dam reservoirs are focused on its effect on the river channels downstream of dams. However, little is known about the evolution of river channels upstream of dams (in backwater areas). In this paper I propose a conceptual model of alluvial channel changes in the backwater. It assumes that three conditions of a channel that may occur in the pre-dam period. These are sediment supply deficit, balance and surplus compared to the river transport capacity. These conditions can be strengthened, stable or weakened. In the post-dam period these conditions is modified by the influence of the dam reservoir, which may affect the trajectory of channel changes, as well as its response and adjustment time in the backwater. The adjustment of channel parameters, in spite of the reservoir operation mode, also depends on the local river, reach characteristics and the magnitude and frequency of floods. Therefore, the use of an appropriate reference reach is inherent in this model. The model suggests that some adverse changes to backwater channels degraded by the regulation can be hampered. The model is based on Lane’s balance concept. It may be useful for explaining and predicting channel changes upstream of reservoirs and forming hypotheses in other studies.

scholarly journals Spatio-temporal Analysis of Sediment Yield Estimation Using Integrated RUSLE and GIS Technique: Case of Nashe Dam Reservoir, Abay Basin, Ethiopia

2021 ◽  
Author(s):  
Habtamu Tamiru ◽  
Meseret Wagari
Keyword(s):  
Land Cover ◽  
Sediment Yield ◽  
Temporal Variations ◽  
Driving Factors ◽  
Spatial And Temporal Variations ◽  
Dam Reservoir ◽  
Rusle Model ◽  
Gis Technique ◽  
Dam Reservoirs ◽  
Annual Sediment

Sediment accumulation in a dam reservoir is a common happening environmental problem throughout the world. Topographic conditions, land use land cover change, the intensity of rainfall, and the soil characteristics are the major driving factors for sedimentation to occur. The effect of sedimentation in a dam reservoir is very visible in the watershed as a result of hilly topographic conditions, high rainfall intensity, thin land cover, and less soil infiltration capacity. In this paper, an integrated RUSLE and GIS technique was implemented to estimate a mean annual sediment yield based on spatial and temporal variations in Nashe dam reservoir situated in Fincha catchment, Abaya River basin, Ethiopia. Spatial and temporal estimation of mean annual sediment yield was estimated using the Revised Universal Soil Loss Equation (RUSLE) model and GIS. Historical 6-year (2014-2019) rainfall for the temporal variations and other physical factors such as soil erodibility, slope and length steepness, management and land used land cover, and support practice for spatial variations were used as sediment driving factors. The mean annual sediment yield ranges from 0 to 2712.65 t ha-1 year-1 was seen. Spatially, Very high, high, moderate, low, and very low sediment yield severity with total area coverage with 25%, 10%, 30%, 15%, and 20% in 2017, 2015, 2019, 2014, and 2018 respectively. The information about the spatial and temporal variations of the severity of sediment yield in RUSLE model has a paramount role to control the entry of sediment into the dam reservoir in this watershed. The results of the RUSLE model can also be further considered along with the watershed for planning strategies for dam reservoirs in the catchment.

Evaluation of the thickness of turbidity currents entering Dez dam reservoir using the extended shallow water model (ESWM)

2014 ◽  
Vol 9 (2) ◽  
pp. 225-234
Author(s):  
Elfimov Valery Ivanovich ◽  
Khakzad Hamid
Keyword(s):  
Shallow Water ◽  
Settling Velocity ◽  
Dead Volume ◽  
Water Model ◽  
Balance Model ◽  
Turbidity Currents ◽  
Dimensionless Number ◽  
Shallow Water Model ◽  
Dam Reservoir ◽  
Dam Reservoirs

This research was developed for the evaluation of the thickness of turbidity currents coming into the reservoir of the Dez dam. In recent years, for the simulation of turbidity currents two types of mathematical models have been employed: (1) the extended shallow water model (ESWM), and (2) the suspension balance model. In this study, we used the ESWM to estimate the thickness of turbidity currents. A random study was carried out from January 2002 to July 2003 in the Dez dam reservoir. Dez dam in Iran is facing a serious sedimentation problem, and its dead volume will be quite full in the next 10 years, and now the inflow water in the hydropower conduit system is becoming turbid. Based on the values of friction dimensionless number (Nf) and dimensionless number of entrainment (NE), the regime of the turbidity currents is Negligible Friction and Negligible Entrainment in the Dez dam reservoir, and the thickness of the turbid layer is assessed as a function of concentration, settling velocity of particles and entrainment. A positive correlation between measurement and model values has shown that this model is the profitable option for estimating the thickness of turbidity currents in dam reservoirs.

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