Patterns of Lake Beseka catchment land use dynamics: Implication on soil organic carbon and pH properties

Belay, Wubetu Anley; Bedada, Tulu Besha; Gessesse, Berhan

doi:10.1016/b978-0-12-815998-9.00018-x

Cited by 6 publications

(6 citation statements)

References 38 publications

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“…According to Belay, (2009) the annual mixing ratios of the Lake water with the Awash River were 6.67%, 13.98%, 45.83%, 27.67%, and 18.73% from 2013 to 2017. Beseka water is generally characterized as brackish quality containing high values of pHw, ECw, SAR and RSC; water of very strongly alkaline type with sever sodicity and salinity hazard (Belay and Eleni, 2009).…”

Section: Spatial Clusteringmentioning

confidence: 99%

Assessment of the Spatio-Temporal Trend of Awash River Water Quality to Address Emerging Irrigation Water Quality Issues in Awash Basin, Ethiopia

2023

IKM

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Awash is the most intensively used river in Ethiopia for agriculture, with irrigation water that spatiotemporally varies in the transport pathways. Ever-increasing anthropogenic activities and climate change have brought challenges, of which, salinity and the degradation of water quality are the prime examples. Information regarding recent water quality and suitability dynamics of the Awash is very limited, and thus, this study was conducted in due time. Samples were gathered from ten water quality monitoring stations, three times a year, for seventeen consecutive years, and analyzed for quality parameters. Results indicate that pH values over the years ranged from 7.4 to 8.4; lying within a slight to moderately alkaline range of water. The EC values ranged from 0.21 to 1.16 dS/m within the 2004-2014 period. The average ion concentrations northwardly spread in the sequence of Ca2+>Na+>Mg2+>K+, HCO3->Cl-> SO42-and Na+>Ca2+>Mg2+>K+. Spatial trend analysis revealed an increasing progression of ECw, SAR, RSC, and ionic constituents. Water quality parameters are found to temporally vary often, with a progressively degrading trend over the study period, confirming the control of water quality mainly by anthropogenic factors. The result further showed a prevalence of slight to moderate sodicity hazards in all samples. The observed space-time variabilities of water quality suggest the proper usage of updated water quality evaluation and spatiotemporal dynamics and trend analysis results in designing appropriate water management strategies in river systems near intensive agricultural, industrial, and urban development areas before unforeseen determinant ground facts hinder development plans in this sub-basin. Summary of key messages of this paper  The Awash River is the longest inland river and one of the intensively used rivers in Ethiopia for domestic, industrial and agricultural purposes.  The water quality of Awash River is under a spatially and temporally continuous and trended change.  Continuous monitoring and evaluation of water quality are mandatory for timely management actions.

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Section: Spatial Clusteringmentioning

confidence: 99%

Assessment of the Spatio-Temporal Trend of Awash River Water Quality to Address Emerging Irrigation Water Quality Issues in Awash Basin, Ethiopia

2023

IKM

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“…Lake Abijata is an alkaline and saline closed-basin terminal lake that is located at 7°35' N, 38°35' E. The main water inputs into the lake come from Horakelo and Bulbula rivers, direct precipitation, and groundwater recharges. Owing to its terminal position in the drainage area and its shallow depth, Lake Abijata is especially susceptible to changes in climate and LULC changes in its catchment [81,90].…”

Section: Lake Abijatamentioning

confidence: 99%

“…The topographic nature of the watershed is characterized by diverse relief displacement including undulating plateau, narrow valleys, and flat plains with elevation ranging from 940 m to 1872 m a.s.l. that falls within Kola (warm & semiarid) agro-climatic zone [90]. The lake area and its watershed are characterized by bimodal and erratic rainfall distribution pattern.…”

Section: Lake Besekamentioning

confidence: 99%

The Shrinking and Expanding Eastern Africa Rift Valley Lakes: The Case of Ethiopian and Kenyan Rift Valley Lakes: Review

Gebreegziabher,

Degefa,

Furi

2023

Preprint

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Morphological study of lakes defines the sensitivity of their watershed. Moreover, it plays important role in safeguarding the lake’s ecosystem services through proper planning and utilization of the lakes’ resources. In the last few decades, the morphology of lakes in Ethiopian and Kenyan Rift (EKR) valley are experiencing contradicting morphological changes. Being in the same system, some are shrinking and others are expanding beyond their natural boundaries. The objective of this review is to shed light on the trends in spatio-temporal water level fluctuation and their contributing factors for lakes to the academia and decision makers. Peer reviewed article journals, conference proceedings, thesis, and book chapters collected from online sources and supplied by authors on request formed a database of 346 documents where 226 are critically assessed. The review indicated that lakes in Ethiopian rift are shrinking and expanding, while Kenyan lakes are expanding. The en-dorheic lakes suffered the most fluctuations due to anthropogenic factors at the expense of loss of forest and woodlands in their watershed. While the lakes’ water quality related to the morphological changes are given less attention, the predicted 12 m drop of Lake Turkana due to projects in the Omo catchment did not materialize.

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“…Previous hydrological studies conducted in the Rift Valley Lakes have predominantly focused on analyzing the impact of single drivers and have failed to provide a quantitative assessment of the respective contributions of land use and climate change on streamflow. For instance, some studies have primarily investigated the effects of high water abstraction for irrigation and industries (Kebede et al, 1994, Zinabu and Elias, 1989, Legesse and Ayenew, 2006, Ayenew, 2002 , environmental degradation (Ayalew et al, 2004, Meshesha et al, 2012, Ayenew, 2004, volcano-tectonics, and sedimentation (Le Turdu et al, 1999, Street andGrove, 1979), bathymetry analysis (Awulachew, 1999) as well as the occurrence of frequent earthquakes and faults (Ayalew et al, 2004, Ayenew, 2002, Belay, 2009. However, the hydrological system of the Rift Valley is very complex and processes within a basin are driven by the interplay of climate, LULC, topography, soil and human activities.…”

Section: Introductionmentioning

confidence: 99%

Unveiling Hydrological Dynamics in Data-Scarce Regions: A Comprehensive Integrated Approach

Ayalew,

Wagner,

Sahlu

et al. 2023

Preprint

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Abstract. The hydrological system of Rift Valley Lakes in Ethiopia has recently experienced changes since the past two decades. Potential causes for these changes include anthropogenic, hydro-climatic and geological factors. The main objective of this study was to utilize an integrated methodology to gain a comprehensive understanding of the hydrological systems and potential driving factors within a complex and data-scarce region. To this end, we integrated a hydrologic model, change point analysis, indicators of hydrological alteration (IHA), and bathymetry survey to investigate hydrological dynamics and potential causes. A hydrologic model (SWAT+) was parameterized for the gauged watersheds and extended to the ungauged watersheds using multisite regionalization techniques. The SWAT+ model performed very good to satisfactory for daily streamflow in all watersheds with respect to the objective functions, Kling–Gupta efﬁciency (KGE), the Nash–Sutcliffe efﬁciency (NSE), Percent bias (PBIAS). The findings reveal notable changes of lake inflows and lake levels over the past two decades. Chamo Lake experienced an increase in area by 11.86 km², in depth by 4.4 m, and in volume by 7.8 x 108 m³. In contrast, Lake Abijata witnessed an extraordinary 68% decrease in area and a depth decrease of 1.6 m. During the impact period, the mean annual rainfall experienced a decrease of 6.5% and 2.7% over the Abijata Lake and the Chamo Lake, respectively. Actual evapotranspiration decreased by 2.9% in Abijata Lake but increased by up to 0.5% in Chamo Lake. Surface inflow to Abijata Lake decreased by 12.5%, while Lake Chamo experienced an 80.5% increase in surface inflow. Sediment depth in Chamo Lake also increased by 0.6 m. The results highlight that the changing hydrological regime in Chamo Lake is driven by increased surface runoff and sediment intrusion associated with anthropogenic influences. The hydrological regime of Abijata Lake is affected by water abstraction from feeding rivers and lakes for industrial and irrigation purposes. This integrated methodology provides a holistic understanding of complex data scarce hydrological systems and potential driving factors in the Rift Valley Lakes in Ethiopia, which could have global applicability.

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Patterns of Lake Beseka catchment land use dynamics: Implication on soil organic carbon and pH properties

Cited by 6 publications

References 38 publications

Assessment of the Spatio-Temporal Trend of Awash River Water Quality to Address Emerging Irrigation Water Quality Issues in Awash Basin, Ethiopia

Assessment of the Spatio-Temporal Trend of Awash River Water Quality to Address Emerging Irrigation Water Quality Issues in Awash Basin, Ethiopia

The Shrinking and Expanding Eastern Africa Rift Valley Lakes: The Case of Ethiopian and Kenyan Rift Valley Lakes: Review

Unveiling Hydrological Dynamics in Data-Scarce Regions: A Comprehensive Integrated Approach

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