Modeling wind-induced currents in lake Bolmen, Sweden, using TELEMAC 2D
(2021) In TVVR21/5007 VVRM01 20211Division of Water Resources Engineering
- Abstract
- Transport and material intermixing within lake systems have a significant impact on lake water quality. However, since researchers are primarily concerned with biological, environmental, and ecological aspects, physics and hydrodynamic behavior in lake water currents frequently receive less attention.
The results of several wind-induced current circulation scenarios in Lake Bolmen with its complicated bathymetry are presented. The significance of various physical parameters influencing the circulation pattern owing to wind force acting on the lake, as well as the prediction of how physical changes can modify the circulation pattern, were explored. Herein a two-dimensional mathematical model for Bolmen Lake in Sweden was analyzed by... (More) - Transport and material intermixing within lake systems have a significant impact on lake water quality. However, since researchers are primarily concerned with biological, environmental, and ecological aspects, physics and hydrodynamic behavior in lake water currents frequently receive less attention.
The results of several wind-induced current circulation scenarios in Lake Bolmen with its complicated bathymetry are presented. The significance of various physical parameters influencing the circulation pattern owing to wind force acting on the lake, as well as the prediction of how physical changes can modify the circulation pattern, were explored. Herein a two-dimensional mathematical model for Bolmen Lake in Sweden was analyzed by TELEMAC-MASCARET Software. QGIS and Blue Kenue software were used to processing and visualize the data and results. Simulation conducted for steady winds, stratified water condition, and actual wind data. Wind intensity and direction affect the lake's ultimate hydrodynamic circulation. In steady-state simulations, stable circulation vector graphs displaying water current movements were achieved after two days. The tracer was included in a lake model to assess the effects of instantaneous solute transmission via advection and diffusion processes. Tracer time-series graphs and velocity maps were also employed to understand the mixing process within the lake.
Vorticity patterns of the velocity field and the tracer analysis were the key indicators used to identify the hydrodynamic circulation governed by wind force. Vorticity patterns and magnitude of velocity fields change within the lake area and were distinguished with the changing wind direction and magnitude. In each simulation clear patterns observed distinguishable from the rest of the simulations carried out. Also, noticeable tracer detection times were observed in each simulation. Stratification seems to have minimal impact on water currents and their characteristics. The study can be further improved by accommodating three-dimensional modeling, water inflow and outflow to the lake, and calibrating with water level data. (Less) - Popular Abstract
- Lake Bolmen serves as the primary source of water for the majority of Skåne's areas. Understanding how this water source is influenced by changes in climate, weather, and land use is becoming more crucial in ensuring that Lake Bolmen remains a stable water supply in the future. Lately, Bolmen has been noticed with watercolor shifting (brownification). Hence, numerous researches have been performed on biological, chemical, and environmental aspects. However, no reported information was found on wind-induced water currents and how they affect mixing and material transportation in Lake Bolmen. As a result, this study was undertaken in order to study various configurations of wind effect on lake currents and to further explore the mixing... (More)
- Lake Bolmen serves as the primary source of water for the majority of Skåne's areas. Understanding how this water source is influenced by changes in climate, weather, and land use is becoming more crucial in ensuring that Lake Bolmen remains a stable water supply in the future. Lately, Bolmen has been noticed with watercolor shifting (brownification). Hence, numerous researches have been performed on biological, chemical, and environmental aspects. However, no reported information was found on wind-induced water currents and how they affect mixing and material transportation in Lake Bolmen. As a result, this study was undertaken in order to study various configurations of wind effect on lake currents and to further explore the mixing phenomenon caused by wind-driven currents. To accomplish this task, a two-dimensional numerical model of Bolmen Lake was created using the TELEMAC-MASCARET computer software system. Several simulations were run by changing the magnitude and direction of the wind in the specified two-dimensional settings. Identifying any unique characteristics of wind-induced currents and observations will be examined. Ultimately, the goal of this research is to better understand the relationship involving wind-induced currents and hydrodynamic behavior in Lake Bolmen. (Less)
Please use this url to cite or link to this publication:
http://lup.lub.lu.se/student-papers/record/9056809
- author
- Ekanayake, Prasanjaya Bandara LU
- supervisor
-
- Clemens Klante LU
- Magnus Larson LU
- organization
- course
- VVRM01 20211
- year
- 2021
- type
- H2 - Master's Degree (Two Years)
- subject
- keywords
- Bolmen Lake, TELEMAC 2D, Wind induced currents, QGIS, Blue Kenue
- publication/series
- TVVR21/5007
- report number
- 21/5007
- ISSN
- 1101-9824
- language
- English
- additional info
- Examiner: Rolf Larsson
- id
- 9056809
- date added to LUP
- 2021-06-20 21:52:07
- date last changed
- 2021-06-20 21:52:07
@misc{9056809,
abstract = {{Transport and material intermixing within lake systems have a significant impact on lake water quality. However, since researchers are primarily concerned with biological, environmental, and ecological aspects, physics and hydrodynamic behavior in lake water currents frequently receive less attention.
The results of several wind-induced current circulation scenarios in Lake Bolmen with its complicated bathymetry are presented. The significance of various physical parameters influencing the circulation pattern owing to wind force acting on the lake, as well as the prediction of how physical changes can modify the circulation pattern, were explored. Herein a two-dimensional mathematical model for Bolmen Lake in Sweden was analyzed by TELEMAC-MASCARET Software. QGIS and Blue Kenue software were used to processing and visualize the data and results. Simulation conducted for steady winds, stratified water condition, and actual wind data. Wind intensity and direction affect the lake's ultimate hydrodynamic circulation. In steady-state simulations, stable circulation vector graphs displaying water current movements were achieved after two days. The tracer was included in a lake model to assess the effects of instantaneous solute transmission via advection and diffusion processes. Tracer time-series graphs and velocity maps were also employed to understand the mixing process within the lake.
Vorticity patterns of the velocity field and the tracer analysis were the key indicators used to identify the hydrodynamic circulation governed by wind force. Vorticity patterns and magnitude of velocity fields change within the lake area and were distinguished with the changing wind direction and magnitude. In each simulation clear patterns observed distinguishable from the rest of the simulations carried out. Also, noticeable tracer detection times were observed in each simulation. Stratification seems to have minimal impact on water currents and their characteristics. The study can be further improved by accommodating three-dimensional modeling, water inflow and outflow to the lake, and calibrating with water level data.}},
author = {{Ekanayake, Prasanjaya Bandara}},
issn = {{1101-9824}},
language = {{eng}},
note = {{Student Paper}},
series = {{TVVR21/5007}},
title = {{Modeling wind-induced currents in lake Bolmen, Sweden, using TELEMAC 2D}},
year = {{2021}},
}