Geomorphology alteration effects over Kävlinge River Basin
(2020) In TVVR20/5018 VVRM01 20201Division of Water Resources Engineering
- Abstract
- This thesis focuses on the case study over the Kävlinge catchment located in the south of Sweden, and mainly in the Kävlinge river. This river, which is the mainstream of the catchment, has been subject to modifications due to agricultural activities. Such modifications, like straightening or increasing the depth and channeling sections of the river, will affect the river’s hydrodynamics. These interventions are often made to reduce the impacts of fluvial floods in the presence of extreme rainfall events. Such floods can be expected to occur more frequently in the future because of climate change. However, these modifications may also affect soil erosion and can have other adverse effects on the river ecosystem. This work will use a... (More)
- This thesis focuses on the case study over the Kävlinge catchment located in the south of Sweden, and mainly in the Kävlinge river. This river, which is the mainstream of the catchment, has been subject to modifications due to agricultural activities. Such modifications, like straightening or increasing the depth and channeling sections of the river, will affect the river’s hydrodynamics. These interventions are often made to reduce the impacts of fluvial floods in the presence of extreme rainfall events. Such floods can be expected to occur more frequently in the future because of climate change. However, these modifications may also affect soil erosion and can have other adverse effects on the river ecosystem. This work will use a physics-based hydrological model to simulate the hydrodynamics conditions of the river and the basin, along with the effects of river straightening. These are compared with the modeling of the original river course. This study is a starting point for further analysis and research aimed at improving the ecological conditions of the Kävlinge river basin.
After running the simulations, the models show a decrease in the water level of 0.02 m and a discharge peak reduction of 2 m3/s and a delay in the presence of the Max. water level. Furthermore, the results of a second model simulation using cross-sections generated using the elevation values, show the same tendency and showing a clearer effect of meander over the fluvial floods in sections downstream. (Less) - Popular Abstract
- The geomorphology is the study of the landform and their processes, and how the interaction with air, water and ice change and mould the landforms (British Society for Geomorphology, n.d.). While the geomorphology of a river may change along the time by natural way (Kline, n.d.), beside this, human activity also affect the geomorphology of the rivers, where some cases by straightening river and increasing the depth of the channel altered the hydrodynamics for purposes such as increase the drainage of the river and flood plains. This happen in the Kävlinge river Basin, when in looks for increasing the agricultural productivity of the area, alterations over the Kävlinge river were made.
This work will use a physics-based hydrological... (More) - The geomorphology is the study of the landform and their processes, and how the interaction with air, water and ice change and mould the landforms (British Society for Geomorphology, n.d.). While the geomorphology of a river may change along the time by natural way (Kline, n.d.), beside this, human activity also affect the geomorphology of the rivers, where some cases by straightening river and increasing the depth of the channel altered the hydrodynamics for purposes such as increase the drainage of the river and flood plains. This happen in the Kävlinge river Basin, when in looks for increasing the agricultural productivity of the area, alterations over the Kävlinge river were made.
This work will use a physics-based hydrological models, built in MIKE HYDRO, from DHI, to simulate the hydrodynamics conditions of the river and the basin, along with the effects of river straightening. These are compared with a modeling of the original river course. This study is a starting point for further analysis and research aimed at improving the ecological conditions of the Kävlinge river basin. The analysis was conducted using Interpolated cross section from a previous study in the river, and cross-sections generated by the software MIKE HYDRO using the elevation data. The results of the simulations in both models presented a decrease in the water in the areas downstream of the meanders in the old river simulation, as well as a delay in the time when the highest peak make presence.
Against the old river obtained from historic map of 1915, the current river presents a length reduction around15%. This may have also influenced the result from the simulations, which present in the first model using interpolated cross-sections an increase in the water level and discharge downstream the meanders section by 0.56% and 1.35% respectively. While in the second model with DEM cross-sections, the discharge peak increase in 2.18%, in respect to the old river simulation. At the same time the DEM simulation shows a decrease by the meanders over the flooded area, as the width of the flooded downstream of the meander present a reduction around 50%. (Less)
Please use this url to cite or link to this publication:
http://lup.lub.lu.se/student-papers/record/9025697
- author
- Frias Olguin, Erik LU
- supervisor
- organization
- course
- VVRM01 20201
- year
- 2020
- type
- H2 - Master's Degree (Two Years)
- subject
- keywords
- Kävlingeån, DEM, Flooding, Geomorphology, model, MIKE HYDRO
- publication/series
- TVVR20/5018
- report number
- 20/5018
- ISSN
- 1101-9824
- language
- English
- additional info
- Examiner: Linus Zhang
- id
- 9025697
- date added to LUP
- 2020-08-28 09:26:47
- date last changed
- 2020-08-28 09:26:47
@misc{9025697,
abstract = {{This thesis focuses on the case study over the Kävlinge catchment located in the south of Sweden, and mainly in the Kävlinge river. This river, which is the mainstream of the catchment, has been subject to modifications due to agricultural activities. Such modifications, like straightening or increasing the depth and channeling sections of the river, will affect the river’s hydrodynamics. These interventions are often made to reduce the impacts of fluvial floods in the presence of extreme rainfall events. Such floods can be expected to occur more frequently in the future because of climate change. However, these modifications may also affect soil erosion and can have other adverse effects on the river ecosystem. This work will use a physics-based hydrological model to simulate the hydrodynamics conditions of the river and the basin, along with the effects of river straightening. These are compared with the modeling of the original river course. This study is a starting point for further analysis and research aimed at improving the ecological conditions of the Kävlinge river basin.
After running the simulations, the models show a decrease in the water level of 0.02 m and a discharge peak reduction of 2 m3/s and a delay in the presence of the Max. water level. Furthermore, the results of a second model simulation using cross-sections generated using the elevation values, show the same tendency and showing a clearer effect of meander over the fluvial floods in sections downstream.}},
author = {{Frias Olguin, Erik}},
issn = {{1101-9824}},
language = {{eng}},
note = {{Student Paper}},
series = {{TVVR20/5018}},
title = {{Geomorphology alteration effects over Kävlinge River Basin}},
year = {{2020}},
}