scholarly journals Application of geoinformation techniques to determine zones of sediment resuspension induced by wind waves in lakes (using two lakes from Northern Poland as examples)

2016 ◽  
Vol 16 (1) ◽  
pp. 3-14
Author(s):  
Elżbieta Bajkiewicz-Grabowska ◽  
Maciej Markowski ◽  
Krzysztof Lemańczyk
Keyword(s):  
Lake Water ◽  
Wind Waves ◽  
Sediment Resuspension ◽  
Simulation Method ◽  
Northern Poland ◽  
Gis Tools

Abstract Resuspension in lakes affects the quality of lake water. It is possible to model this process and visualize its outcomes using GIS tools. An assessment of the size of the zone of sediment resuspension was made for two lakes located in Northern Poland threatened by rapid eutrophication. For each of the lakes, four simulations using two methods for determining the effective wind length (F) (Model 1 and Model 2) and two methods for determining the wind wavelength (Lw) (Model A and Model B) were performed. The analysis, taking into account the morphometry of the studied lakes and anemometric conditions, indicated that the differentiator is the applied simulation method of calculating the wavelength caused by the wind. The analysis is theoretical in nature and the results need to be verified in the field..

A design approach for selecting the optimum water cover depth for subaqueous disposal of sulfide mine tailings

2005 ◽  
Vol 42 (1) ◽  
pp. 207-228 ◽  
Author(s):  
Mustafa A Samad ◽  
Ernest K Yanful
Keyword(s):  
Shear Stress ◽  
Mine Tailings ◽  
Wind Waves ◽  
Sediment Resuspension ◽  
Critical Shear Stress ◽  
Linear Wave ◽  
Cover Depth ◽  
Water Cover ◽  
The Impact

The use of shallow water covers to flood reactive mine tailings is one of the most effective and common methods of managing sulfide-rich reactive mine tailings in temperate climates. One of the aspects critical to the success of subaqueous tailings disposal is the water depth required in the pond to maintain desirable water quality. Wind waves and associated pressure-driven currents could resuspend the tailings, which might result in increased oxidation and compromise the quality of the water cover. Although existing methodologies for water cover design are based on eliminating tailings resuspension, sediment-trap data from several sites in Canada still indicate resuspension in most of the ponds. In the present paper, a design methodology is proposed for optimizing the water cover depth, allowing sediment resuspension within regulatory limits. The method uses linear wave theory and countercurrent flow profiles to obtain the total bottom shear stress, which is then compared with the critical shear stress of the tailings to predict the onset of erosion and resuspension and to compute the resulting mass of suspended tailings. Application of the methodology to a tailings pond in British Columbia, Canada, indicates that although a maximum water cover depth of 2.5 m is necessary to eliminate tailings resuspension, a maximum depth of 1.5 m could still be used, as the resulting concentration of suspended tailings remains within the regulatory limit. The methodology also provides an estimate of the impact of resuspension-induced oxidation on the quality of the water cover above the tailings, such as sulfate production.Key words: mine tailings, water cover, wind waves, countercurrent flows, shear stress, resuspension.

scholarly journals Investigation of Water Quality Parameters from Ramna, Crescent and Hatirjheel Lakes in Dhaka City

2015 ◽  
Vol 8 (1) ◽  
pp. 1-5 ◽  
Author(s):  
MS Islam ◽  
M Rehnuma ◽  
SS Tithi ◽  
MH Kabir ◽  
L Sarkar
Keyword(s):  
Water Quality ◽  
Lake Water ◽  
Public Awareness ◽  
Aquatic Organisms ◽  
Quality Parameters ◽  
Water Runoff ◽  
Dhaka City ◽  
Sound Environment ◽  
Surrounding Areas

The study was conducted to know the status of water quality of the Ramna, Crescent and Hatirjheel lakes in the Dhaka city. Water samples were collected from three different points of each lake and analyzed for various physicochemical parameters including temperature, pH, EC, TDS, DO, BOD, hardness, alkalinity, acidity during the period from November 2013 to April 2014. The mean temperature 22.54, 24.59 and 24.24°C; EC 15400, 282.00 and 618.27 ?Scm-1; TDS 85.38, 155.60 and 339.90 ppm; pH 7.73, 7.85 and 7.67; DO 3.51, 3.92 and 3.65 ppm; BOD 0.93, 0.73 and 3.15 ppm; hardness 95.00, 108.56 and 105.11 ppm; alkalinity 48.9, 120.7 and 249.1 ppm, and acidity 2.18, 2.67 and 2.05 ppm were investigated from Ramna, Crescent and Hatirjheel lakes, respectively. Lower concentration of DO was observed in all three lakes that severely harmed the aquatic organisms and degrade their habitat. The comparative study demonstrated that the concentration of BOD, EC, TDS, alkalinity and acidity of Hatirjheel Lake was higher than Ramna and Crescent lakes which indicated pollution of the lake water. The rain and storm water runoff, lack of awareness of people were responsible for the pollution of Ramna, Crescent and Hatirjheel lakes water. Connection of the sewerage line with the rain water collection channels and mixing of solid waste with lake water are the main reasons for pollution of Hatirjheel lake. Poor water quality of these lakes affects the ecosystem and aesthetic beauty negatively. To maintain the sound environment and healthy ecosystem of the lakes and the surrounding areas need proper management and monitoring and implementation of existing laws and regulations. Moreover public awareness is necessary otherwise it is hardly possible to maintain sound water quality of these three lakes.J. Environ. Sci. & Natural Resources, 8(1): 1-5 2015

scholarly journals Natural stochasticity vs. management effort: use of year-to-year variance for disentangling significance of two mutually confounding factors affecting water quality of a Norwegian cold dimictic lake

2014 ◽  
Vol 11 (11) ◽  
pp. 12489-12518
Author(s):  
A. T. Romarheim ◽  
K. Tominaga ◽  
G. Riise ◽  
T. Andersen
Keyword(s):  
Water Quality ◽  
Lake Water ◽  
Phytoplankton Biomass ◽  
Light Attenuation ◽  
System Structure ◽  
Confounding Factors ◽  
Lake Water Quality ◽  
Management Effort ◽  
Stochastic Event

Natural stochasticity can pose challenges in managing the quality of the environment, or hinder understanding of the system structure. It is problematic because unfavourable stochastic event cancels the costly management effort and because favourable stochastic event overestimates success of the management effort. This paper presents a variance-based modelling method that can be used to quantify the extent to which the natural stochasticity can affect the target environment. We use a case study of a lake water quality assessment in a Norwegian lake of Årungen, together with a lake model MyLake, in order to present the method, and how this method could assist in answering scientific and managerial questions. Specifically, the case study's goal was to disentangle the respective significance of nutrient loading (management) and weather (the confounding natural stochasticity). Many scientifically and managerially relevant understandings have been revealed. For example, variation in runoff volume was most prevalent during autumn and winter, while variation in phosphorus inflow was most extensive from late winter to early spring. Thermal related properties in the lake were mostly determined by weather conditions, whereas loading was the most important factor for phytoplankton biomass and water transparency. Mild winters and greater inputs of suspended matter and phosphorus were followed by increased phytoplankton biomass and light attenuation. These findings suggest also that future changes in the global climate may have important implications for local water management decision-making. The present method of disentangling mutually confounding factors is not limited to lake water quality studies and therefore should provide certain utility in other application field of modelling.

scholarly journals WATER QUALITY ANALYSIS: A CASE STUDY IN BYRAMANGALA LAKE WATER AND SURROUNDING GROUND WATER

2017 ◽  
Vol 5 (4RASM) ◽  
pp. 71-77
Author(s):  
Babitha Rani ◽  
Dimple Bahri ◽  
Prabin Neupane ◽  
Kunal Kothari ◽  
Vishal Gadgihalli ◽  
...  
Keyword(s):  
Water Quality ◽  
Ground Water ◽  
Lake Water ◽  
Suspended Solids ◽  
Quality Analysis ◽  
Total Hardness ◽  
Water Quality Analysis ◽  
E Coli

A study was carried out to find out the water quality ofByramangala lake of Ramanagara district. The water quality of Byramangala lake water and ground water from bore wells situated in the area within 600 meters surrounding the lake was analyzed. The quality analysis of various parameters such as BODs, COD, DO, E-Coli, and pH, Total Dissolved Solids, Total Suspended Solids and Total Hardness were tested. In addition, the presence of metals such as Cadmium (Cd), Chromium (Cr), Lead (Pb), and Iron (Fe) in the lake water and ground water samples were tested. Results for the various tests conducted showed similar trends for both lake water and ground water. It was observed that certain parameters such as BOD5, and COD were beyond permissible limits as per the BIS standards for drinking water. A few remedial measures have been proposed that may help in mitigating the pollution in the selected project area Byramangala Lake.

scholarly journals Landscape Quality Valuation for its Preservation and Treasuring

2014 ◽  
Vol 11 ◽  
pp. 625-633 ◽  
Author(s):  
Domenico Enrico Massimo ◽  
Mariangela Musolino ◽  
Antonino Barbalace ◽  
Cinzia Fragomeni
Keyword(s):  
Analysis Tool ◽  
Quality Of Life Research ◽  
Team Research ◽  
Gis Tools ◽  
Landscape Integrity ◽  
New Construction ◽  
Tool Set ◽  
Set Up ◽  
Landscape Units

Pollution, environmental disruption, oversized urban development and infrastructure new construction jeopardize landscape integrity and peoples quality of life. Research deals with the landscape protection and enhancement providing governments and decision makers with a comprehensive Decision Support System to assess the quality of natural and cultural heritage and address planning measures and policy actions for landscape treasuring. Research set-up a sound methodology relying upon GIS tools, to spatially detect and define landscape units along with their endowment such as natural, ecological, historic, cultural, and urban resources then valuated with a GIS integrated multi criteria analysis tool set-up by the research team. Research developed a Case Study in the European Mediterranean Basin, validating the whole system and the performance and support of the GIS tools. Results achieved open the possibility to generalize the prototype application at regional, country and federation levels and therefore support the planning implementation for landscape enhancement.

Application of Transfer Functions to the Thermal Processing of Sweet and Sour Cherries Preserves: Influence of Particle and Container Sizes

2003 ◽  
Vol 9 (2) ◽  
pp. 69-76 ◽  
Author(s):  
C. A. Márquez ◽  
V. O. Salvadori ◽  
R. H. Mascheroni ◽  
A. De Michelis
Keyword(s):  
Thermal Processing ◽  
Transfer Functions ◽  
Sucrose Solution ◽  
Simulation Method ◽  
Point Of View ◽  
Average Error ◽  
Transfer Function Method ◽  
Glass Containers ◽  
Enzyme Degradation

The conditions of thermal processing of fruit preserves packed in transparent glass containers have great importance from the point of view of the final product appearance. Process simulation can allow to predict the quality of the product and its possible degradation. This work applied the transfer function method to simulate the pasteurisation of whole sweet and sour cherries canned in glass containers, with a 25 °Brix sucrose solution as covering liquid, and the predicted results were experimentally tested. The influence of fruit and container diameters on the treatment times was analysed. Kinetic models for enzyme degradation were coupled to the prediction model as examples of the possibilities of optimising the whole pasteurisation process. The accuracy (average error in predicted temperatures: 2.1%) of the simulation method was satisfactory for practical purposes, its use resulted simple and fast, and it allowed adjusting of pasteurisation times, even during the process.

On biogeochemistry and water quality of river canals in Northern France subject to daily sediment resuspension due to intense boating activities

2015 ◽  
Vol 197 ◽  
pp. 295-308 ◽  
Author(s):  
E. Prygiel ◽  
P.-J. Superville ◽  
D. Dumoulin ◽  
F. Lizon ◽  
J. Prygiel ◽  
...  
Keyword(s):  
Water Quality ◽  
Sediment Resuspension ◽  
Northern France
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