Climate change impact on Lake Tana water storage, Upper Blue Nile Basin, Ethiopia

Abstract

Temperature and precipitation trend fluctuations influence the components of the hydrological cycle and the availability of water supplies and their resulting shifts in the balance of lake water (lake level). Quantile mapping was applied to correct temperature biases, and power transformation was applied for rainfall correction. The performance of the HBV model was evaluated through calibration and validation using objective functions (RVE, NSE) and

Water Security Problems of Lake Tana and Its Possible Management Options: A Review

“…The lake receives water from several rivers but has been experiencing reduced inflow due to drought and overuse because temperature and precipitation trend fluctuations influence the components of the hydrological cycle and the availability of water supplies and their resulting shifts in the balance of lake water level (Wubneh, 2022). According to the same author, climate change has caused changes in rainfall patterns, resulting in a decrease in precipitation in the watershed of Lake Tana.…”

“…Water security problems of Lake Tana, comprising water scarcity and water quality problems, arise from various factors, including climate change, high population growth, water abstraction, pollution, and habitat degradation. Unregulated increased water abstraction from the lake for irrigation and domestic use has reduced water levels (Wubneh et al, 2022) and decreased water quality (Teferi et al, 2021). Furthermore, the discharge of untreated sewage, agricultural effluents, and industrial waste into the lake has also contributed to the deterioration of its water quality and the health of its aquatic ecosystem, making it unsafe for human consumption (Wondyfraw et al, 2019).…”

Climate change impact on water resources availability in the kiltie watershed, Lake Tana sub-basin, Ethiopia

“…Temperature and precipitation trends can affect the hydrological cycle's components, as well as the availability of water resources in the watershed or basin [ 1 ]. Knowing the existing and future trends in freshwater availability is crucial for adjusting to a changing and unpredictable climate since freshwater availability is essential for food security, human health, ecological health, land use change, economic development, and regional conflict [ 2 ].…”

Impact of climate change on shumbrite small scale irrigation project, South Gojjam subbasin, Ethiopia

“…Climate change is defined as the state of climate identified by changes in the mean and/or variability of its properties for long periods, whether due to natural activity or as a result of human activity. For example, influences such as changes in solar radiation and volcanism, occur naturally and contribute to the natural variability of the climate system [ 1 ]. Temperature fluctuations and changes in precipitation trends influence the components of the hydrological cycle and the availability of water supplies in general.…”