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Lake surface area expansion: Insights into the role of volcano-tectonic processes, Lake Beseka, East Africa
Gebremichael, Esayas Seyoum, Wondwosen M. Ishimwe, Benite Sataer, Guzalay
Gebremichael, Esayas
Seyoum, Wondwosen M.
Ishimwe, Benite
Sataer, Guzalay
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Publisher
Elsevier BV
Date
2022
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Abstract
Lake Beseka, Ethiopia Lake Beseka has been expanding despite climatic and other relevant variables remaining largely the same over time. In this study, we applied an integrated approach based on multi-source datasets—Synthetic Aperture Radar (SAR), Landsat thermal band data, precipitation, and physicochemical and isotope water quality data—to understand the processes that govern the lake surface area expansion with a focus on the volcano-tectonic process. Our findings show the following: (1) overall annual rainfall trend showed a declining trend, suggesting that rainfall is not the main source of water that led to the expansion of the lake; (2) recent vertical deformation rates reveal high subsidence rates on areas bordering the lake to the north, west, and southwest that are dissected by an echelon of fissures and faults, and physicochemical and isotopic water quality analysis from previous studies reveal dilution of the lake water by a new source of water in these parts; and (3) the thermal data analysis showed high land surface temperature values to the north of the lake, where a recent swarm of earthquakes were detected. We attributed the lake surface area growth to two processes: groundwater influx into the lake surface facilitated by active volcano-tectonic processes and volcano-tectonic-induced subsidence that creates favorable conditions for the water to expand to new areas. • Multi-source datasets were used to understand the processes that govern the lake surface area expansion of Lake Beseka . • Long-term rainfall analysis revealed a declining trend indicating that rainfall is not the source of water for the expansion. • Results indicate that coupled groundwater influx to the lake and subsidence processes are the causes for the expansion.
Contents
Subject
Geology
Volcano
Tectonics
Precipitation
Groundwater
Surface water
Subsidence
Hydrology (agriculture)
Meteoric water
Physical geography
Water quality
Earth science
Geomorphology
Geochemistry
Environmental science
Seismology
Ecology
Geography
Geotechnical engineering
Structural basin
Environmental engineering
Meteorology
Biology
Volcano
Tectonics
Precipitation
Groundwater
Surface water
Subsidence
Hydrology (agriculture)
Meteoric water
Physical geography
Water quality
Earth science
Geomorphology
Geochemistry
Environmental science
Seismology
Ecology
Geography
Geotechnical engineering
Structural basin
Environmental engineering
Meteorology
Biology
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Research Projects
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Department
Geological Sciences