Assessment of the Contribution of Groundwater Flow and Surface Flow from Bolmsö Island to Lake Bolmen, Sweden
(2020) In ISRN LUTVDG/ (TVTG-5166)/1-44/ (2020) VTGM01 20201Engineering Geology
Civil Engineering (M.Sc.Eng.)
- Abstract
- The increase of brownification in surface waters has been a problem for rivers and lakes from the northern hemisphere. The main factors of this water brownification are the increase of dissolved organic matter and iron in water bodies. This study aims to assess the contribution of groundwater flow and surface flow from Bolmsö Island to the water balance of Lake Bolmen, Sweden. This assessment helps to estimate the interaction between the groundwater and surface water at Bolmsö Island and make predictions about the groundwater and surface water flow influencing water browning inside Lake Bolmen.
MODFLOW within GMS 10.4 groundwater model was chosen. A steady-state condition was used during simulation and calibration of the model. To obtain... (More) - The increase of brownification in surface waters has been a problem for rivers and lakes from the northern hemisphere. The main factors of this water brownification are the increase of dissolved organic matter and iron in water bodies. This study aims to assess the contribution of groundwater flow and surface flow from Bolmsö Island to the water balance of Lake Bolmen, Sweden. This assessment helps to estimate the interaction between the groundwater and surface water at Bolmsö Island and make predictions about the groundwater and surface water flow influencing water browning inside Lake Bolmen.
MODFLOW within GMS 10.4 groundwater model was chosen. A steady-state condition was used during simulation and calibration of the model. To obtain a running model, different assumptions and simplifications were done.
The results of the simulation and the calibration show that the water balance between Bolmsö Island and Lake Bolmen includes a significant amount of groundwater almost 12970 m3/d flowing from the island to the lake and a small amount of water approximately 30 m3/d flowing from the lake to the island. The resulting amount of surface runoff was estimated to be 18100 m3/d.
Water flowing from Bolmsö Island to Lake Bolmen is likely to contain an uncertain amount of red-brown colored soil particles from bogs and fens. Hence, there is a probability of brownification of water in the lake, however, to apply the results of this thesis, further investigation and simulations are required. (Less) - Popular Abstract
- Groundwater is known as water underneath the earth’s surface, in the zone of saturation in geological formations known as aquifers. They store a large portion of the easily available fresh water, about 98% of fresh water on the earth. Surface water can be regarded as water that occurs on the earth’s surface in liquid or solid form. Both surface water and groundwater play an important role to the environment and human life. Hence the quality of surface water and groundwater is crucial when it comes to their usage.
Lake Bolmen, twelfth of the largest lakes in Sweden, serves as drinking water source for the western region of Scania. There are many islands in the lake and the largest is Bolmsö Island. Water in this lake is gradually changing... (More) - Groundwater is known as water underneath the earth’s surface, in the zone of saturation in geological formations known as aquifers. They store a large portion of the easily available fresh water, about 98% of fresh water on the earth. Surface water can be regarded as water that occurs on the earth’s surface in liquid or solid form. Both surface water and groundwater play an important role to the environment and human life. Hence the quality of surface water and groundwater is crucial when it comes to their usage.
Lake Bolmen, twelfth of the largest lakes in Sweden, serves as drinking water source for the western region of Scania. There are many islands in the lake and the largest is Bolmsö Island. Water in this lake is gradually changing its color to brown color mainly due to the increasing of dissolved organic matter and iron which could have effects on the society and the environment. Finding the cause behind this color change is one of the important things that must be done to deal with this problem.
This master thesis investigates the impact of groundwater and surface water flow originating from Bolmsö Island to the water balance of Lake Bolmen. It has been possible to estimate the interaction between the groundwater and surface water at Bolmsö Island and make predictions about the groundwater flow and surface water flow regarding water browning inside Lake Bolmen.
There are many methods that can be used to find the interaction between the lake and the island. In this study MODFLOW within Groundwater Modeling System is the preferred method. It was used to simulate the amount of groundwater leaving Bolmsö Island to Lake Bolmen and helped to estimate the amount of surface runoff from the island to the lake.
This study indicated that groundwater and surface water flow from Bolmsö Island to Lake Bolmen and also showed that it is possible that this water may contain organic content origination from fens and bogs soils that are located on the island and could lead to watercolor changes in the lake. Further studies are required before the findings of this study can be implemented. (Less)
Please use this url to cite or link to this publication:
http://lup.lub.lu.se/student-papers/record/9023476
- author
- Uwera, Angelique LU
- supervisor
- organization
- alternative title
- Uppskattning av grundvatten- och ytvattenflöde från Bolmsö till sjön Bolmen
- course
- VTGM01 20201
- year
- 2020
- type
- H3 - Professional qualifications (4 Years - )
- subject
- keywords
- Groundwater, Surface water, GMS-MODFLOW, Bolmsö Island, Lake Bolmen, Brownification.
- publication/series
- ISRN LUTVDG/ (TVTG-5166)/1-44/ (2020)
- report number
- ISRN LUTVDG/ (TVTG-5166)/1-44/ (2020)
- language
- English
- additional info
- Examiner: Jan-Erik Rosberg
- id
- 9023476
- date added to LUP
- 2020-06-30 13:39:44
- date last changed
- 2020-06-30 13:39:44
@misc{9023476,
abstract = {{The increase of brownification in surface waters has been a problem for rivers and lakes from the northern hemisphere. The main factors of this water brownification are the increase of dissolved organic matter and iron in water bodies. This study aims to assess the contribution of groundwater flow and surface flow from Bolmsö Island to the water balance of Lake Bolmen, Sweden. This assessment helps to estimate the interaction between the groundwater and surface water at Bolmsö Island and make predictions about the groundwater and surface water flow influencing water browning inside Lake Bolmen.
MODFLOW within GMS 10.4 groundwater model was chosen. A steady-state condition was used during simulation and calibration of the model. To obtain a running model, different assumptions and simplifications were done.
The results of the simulation and the calibration show that the water balance between Bolmsö Island and Lake Bolmen includes a significant amount of groundwater almost 12970 m3/d flowing from the island to the lake and a small amount of water approximately 30 m3/d flowing from the lake to the island. The resulting amount of surface runoff was estimated to be 18100 m3/d.
Water flowing from Bolmsö Island to Lake Bolmen is likely to contain an uncertain amount of red-brown colored soil particles from bogs and fens. Hence, there is a probability of brownification of water in the lake, however, to apply the results of this thesis, further investigation and simulations are required.}},
author = {{Uwera, Angelique}},
language = {{eng}},
note = {{Student Paper}},
series = {{ISRN LUTVDG/ (TVTG-5166)/1-44/ (2020)}},
title = {{Assessment of the Contribution of Groundwater Flow and Surface Flow from Bolmsö Island to Lake Bolmen, Sweden}},
year = {{2020}},
}