Simulated surface and shallow groundwater resources in the Abaya-Chamo Lake basin, Ethiopia using a spatially-distributed water balance model

Molla, Dagnachew Daniel; Tegaye, Tenalem Ayenew; Fletcher, Christopher G.

doi:10.1016/j.ejrh.2019.100615

Cited by 26 publications

(23 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…MIKE‐SHE is a specially developed software tool for simulating the fully coupled flow and transmission of surface water and groundwater (Molla, Tegaye, & Fletcher, 2019; Ren et al, 2019). MIKE‐SHE uses numerical analysis to establish the spatiotemporal relationship between adjacent grid elements.…”

Section: Methodsmentioning

confidence: 99%

Quantitative analysis of the driving factors for groundwater resource changes in arid irrigated areas

Guo

Niu

et al. 2020

Hydrological Processes

View full text Add to dashboard Cite

How to quantify the impact of climate change and human activities on groundwater is not only a hot topic of current research but also a key point of water resource management in arid irrigated areas. Therefore, this paper analyzes the changes in the trends of land use, climate, and groundwater extraction in the Yanqi Basin in recent years and uses the distributed hydrological model MIKE‐SHE to quantitatively analyze the impacts of these three factors on groundwater resources. The results show that: 1. The Nash coefficients of the simulated and observed groundwater levels during the verification period are 0.84, 0.79 and 0.76; the correlation coefficient between the simulated and observed soil moisture is 0.86. Although there are some uncertainties in the simulation, the results prove that the model can be used to simulate arid irrigated areas. 2. The effects of these three factors on groundwater levels are 5, 12.5 and 82.5%, respectively, and have caused the regional average groundwater level to decrease by a maximum of 0.07, 0.23 and 1.79 m, respectively. The effects of these three factors on the interactions between surface water and groundwater were 7.04, 3.63 and 89.33%. Groundwater extraction has become the main influencing factor of regional groundwater resources changes due to its more direct influence. 3. The influence of groundwater extraction has a strong spatial distribution characteristic and 10% of the study area has been greatly impacted by the groundwater extraction. Base on the above results, integrating multidisciplinary knowledge to establish the relationship between ecological environment and groundwater changes can provide strategies for the sustainable development of groundwater.

show abstract

Section: Methodsmentioning

confidence: 99%

Quantitative analysis of the driving factors for groundwater resource changes in arid irrigated areas

Guo

Niu

et al. 2020

Hydrological Processes

View full text Add to dashboard Cite

show abstract

“…erefore, the study concluded that precipitation and LULC are the main driving factors of actual evapotranspiration in the basin. e previous investigation conducted by Dereje and Nedaw [14] and Molla et al [73] have estimated groundwater recharge, EVT, and surface runoff using the WetSpass hydrological model in upper Bilate watershed and Abaya-Chamo basin.…”

Section: Winter Surface Runoffmentioning

confidence: 99%

“…ey have estimated the mean annual recharge of the catchment to be 9.4% of the total precipitation, while the direct surface runoff as only 20% of the total precipitation. Molla et al [73] revealed that estimated annual amount of loss with EVT is 74.6% of total precipitation in the basin, while with surface runoff, it was 15.7%, with groundwater recharge of only 9.7%. Our present investigated results are not aligned with these findings.…”

Section: Winter Surface Runoffmentioning

confidence: 99%

“…A few researchers [74] have revealed that the settlement and built-up areas have a tendency to generate a high volume of surface runoff within the region because they have substantially smaller amount vegetative area. erefore, the study conducted by Dereje and Nedaw [14], and Molla et al [73] have been ignored by the potential contributions of settlement and built-up area on hydrological processes during their evaluation, although the dynamics of urbanization is evidently ongoing in the basin. During the study, the potential impacts of settlement and the built-up area on surface and subsurface water were investigated, and the determined results experienced that surface runoff has been evidently affected by the degree of settlement and modification of urbanization in the Bilate basin.…”

Section: Winter Surface Runoffmentioning

confidence: 99%

See 1 more Smart Citation

Exemplifying the Effects Using WetSpass Model Depicting the Landscape Modifications on Long‐Term Surface and Subsurface Hydrological Water Balance in Bilate Basin, Ethiopia

Nannawo

Lohani

Eshete

2021

Advances in Civil Engineering

View full text Add to dashboard Cite

The alteration of spatial patterns of landscape interrupts water balance components in Bilate basin of Ethiopia. The aim is to characterize the spatio-temporal variation of surface-subsurface hydrological water balance using the WetSpass model comprising of soil type, topography, groundwater depth, and slope. Environment for Visualizing Images (ENVI) and Arc-GIS software were assimilated for the classification of Landsat images from 1989 to 2019 replicating the forest, shrub, and grasslands which decrease by 4.0%, 9.41%, and 14.87%, respectively, and agricultural land increasing by 27.06% from 1989 to 2019. The goodness of fit in surface runoff and subsurface flow for the two model outputs with the square of regression (R2) of 0.79 and 0.81, while the root mean square errors (RMSEs) 8.26 mm and 8.39 mm for 1989 and 2019, respectively, were calculated. Average annual interception, groundwater recharge, surface runoff, and actual-evapotranspiration were 36.4 mm, 127.34 mm, 614.95 mm, and 517.59 mm, respectively, revealing that WetSpass works remarkably in simulating the components of the hydrological water balance.

show abstract

“…The ∆SM surplus generates surface runoff and/or groundwater recharge, which primarily occurs during the winter when the ET rate is lower than the precipitation. However, ∆SM deficits (negative values or zero values) indicate that the water outflow is more massive than the water inflow due to the severe water loss associated with the high ET rates, especially during the dry months [45].…”

Section: Seasonal Behavior Of the Water Budget Modelmentioning

confidence: 99%

Assessing the Effectiveness of Supplemental Irrigation to Improve Soil Moisture in an Arid Ecosystem with an Emphasis on Climate Change: A Case Study from the State of Kuwait

2020

View full text Add to dashboard Cite

Arid ecosystems are extremely vulnerable to climate change, which is considered one of the serious global environmental issues that can cause critical challenges to the hydrological cycle in arid ecosystems. This work focused on assessing the effectiveness of supplemental irrigation to improve the actual soil moisture content in arid ecosystems and considering climate change impacts on soil moisture. The study was conducted at two fenced protected sites in Kuwait. The first site is naturally covered with Rhanterietum epapposum, whereas the other study site is a supplemented irrigated site, containing several revegetated native plants. The results showed that supplemental irrigation highly improved soil moisture (∆SM) during the winter season by >50%. However, during the summer season, the rainfed and irrigated site showed low ∆SM due to the high temperature and high evapotranspiration (ET) rates. We also found that ∆SM would negatively get impacted by climate change. The climate change projection results showed that temperature would increase by 12%–23%, ET would increase by 17%–19%, and precipitation would decrease by 31%–46% by 2100. Such climate change impacts may also shift the current ecosystem from an arid to a hyper-arid ecosystem. Therefore, we concluded that irrigation is a practical option to support the ∆SM during the low-temperature months only (spring and winter) since the results did not show any progress during the summer season. It is also essential to consider the possibility of future shifting in ecosystems and plant communities in restoration and revegetation planning.

show abstract

Simulated surface and shallow groundwater resources in the Abaya-Chamo Lake basin, Ethiopia using a spatially-distributed water balance model

Cited by 26 publications

References 31 publications

Quantitative analysis of the driving factors for groundwater resource changes in arid irrigated areas

Quantitative analysis of the driving factors for groundwater resource changes in arid irrigated areas

Exemplifying the Effects Using WetSpass Model Depicting the Landscape Modifications on Long‐Term Surface and Subsurface Hydrological Water Balance in Bilate Basin, Ethiopia

Assessing the Effectiveness of Supplemental Irrigation to Improve Soil Moisture in an Arid Ecosystem with an Emphasis on Climate Change: A Case Study from the State of Kuwait

Contact Info

Product

Resources

About