Hydro-engineering solution for a sustainable groundwater management at a cross border region: case of Lake Nyasa/Malawi basin, Tanzania
Tóm tắt
A groundwater resources assessment has been carried out for the Lake Nyasa Basin east Africa, with reference to sub catchments further to the whole basin wise analysis, including quantification of potential yields from the aquifers. Numerical groundwater models, MODFLOW-SURFACT coupled with Visual MODFLOW, were used to assess sub-basin groundwater sustainability (Via “Zone Budget” software package). The model has been calibrated to observed hydraulic head and processed baseflow estimate. It is concluded that the aquifer system is sustained by episodic recharge and the long-term gaining storage which represents the maximum extractable volume. Future predictions of groundwater usage indicate that by 2035 the percentage of annual safe yield extracted will increase to between 11.3 and 103%. Model result suggests that there is a need to revise the current estimate of sustainable yield based on future climate change conditions and projected population growth, which would decrease spring flows substantially and decrease hydraulic head basin-wide. It also suggests that by 2035 some sub catchments will be nearly at or exceeding the annual safe yield leaving no room for socio-economic development, or the need to reduce existing socio-economic demands to meet domestic demands. Besides to improving the natural replenishment capacity through artificial recharge technique, the other option is to increase the percentage of total recharge allocated to the annual safe yield from 10% of the total annual recharge to 20% in these catchments. This provides a basis for management of individual groundwater scheme in sustaining livelihood activities or implications of policies and to develop a plan for potential groundwater extraction scenarios pertaining to water use and allocation.
Tài liệu tham khảo
Al-Weshah R, Yihdego Y (2016) Modelling of strategically vital fresh water aquifers, Kuwait. Environ Earth Sci 75:1315. doi:10.1007/s12665-016-6132-1
Yihdego Y, Reta G, Becht R (2016) Human impact assessment through a transient numerical modeling on the UNESCO World Heritage Site, Lake Naivasha, Kenya. Environ Earth Sci. doi:10.1007/s12665-016-6301-2
Yihdego Y, Reta G, Becht R (2016) Hydrological analysis as a technical tool to support strategic and economic development: case of Lake Naivasha, Kenya. Water Environ J 30(1–2):40–48. doi:10.1111/wej.12162
Yihdego Y, Drury L (2016) Mine water supply assessment and evaluation of the system response to the designed demand in a desert region, central Saudi Arabia. Environ Monit Assess J 188:619. doi:10.1007/s10661-016-5540-8
Ozdemir A (2011) GIS-based groundwater spring potential mapping in the Sultan mountains (Konya, Turkey) using frequency ratio, weights of evidence and logistic regression methods and their comparison. J Hydrol 411:290–308
Pourtaghi ZS, Pourghasemi HR (2014) GIS-based groundwater spring potential assessment and mapping in the Birjand Township, southern Khorasan Province, Iran. Hydrogeol J 22(3):643–662
Bredehoeft J (2005) The conceptualization model problem: surprise. Hydrogeol J 13:37–46
Alley WM, Leake SA (2004) The journey from safe yield to sustainability. Ground Water 42:12–16
Devlin JF, Sophocleous M (2005) The persistence of the water budget myth and its relationship to sustainability. Hydrogeol J 13:549–554
Sophocleous M (2000) From safe yield to sustainable development of water resources: the Kansas experience. J Hydrol 235:27–43
El-Kadi AI, Tillery S, Whittier RB, Hagedorn B, Mair A, Ha K, Koh G (2014) Assessing sustainability of groundwater resources on Jeju Island, South Korea, under climate change, drought, and increased usage. Hydrogeol J 22(3):625–642
Holman IP, Tascone D, Hess TM (2009) A comparison of stochastic and deterministic downscaling methods for modelling potential groundwater recharge under climate change in East Anglia, UK: implications for groundwater resource management. Hydrogeol J 17:1629–1641
Smith A, Walker G, Turner J (2010) Aquifer sustainability factor: a review of previous estimates. International Association of Hydrogeologists (AIH) and the Geological Society of Australia (GSA). EP104589
Turner RJ, Mansour MM, Dearden RÓ, Dochartaigh BÉ, Hughes AG (2015) Improved understanding of groundwater flow in complex superficial deposits using three-dimensional geological-framework and groundwater models: an example from Glasgow, Scotland (UK). Hydrogeol J 23:493–506
Whittier R, Rotzoll K, Dhal S, El-Kadi AI, Ray C, Chang D (2010) Groundwater source assessment program for the state of Hawaii, USA: methodology example application. Hydrogeol J 18:711–723
Conan C, de Marsily G, Bouraoui F, Bidoglio G (2003) A long-term hydrological modelling of the Upper Guadiana river basin (Spain). Phys Chem Earth 28:193–200
Bromley J, Cruces J, Acreman M, Martínez L, Llamas MR (2001) Problems of sustainable groundwater management in an area of over-exploitation: the upper Guadiana catchment, central Spain. Int J Water Resour Dev 17:379–396
Martínez-Santos P, Llamas MR, Martínez-Alfaro PE (2008) Vulnerability assessment of groundwater resources: a modelling-based approach to the Mancha Occidental aquifer, Spain. Environ Model Softw 23:1145–1162
Yihdego Y, Danis C, Paffard A (2015) 3-D numerical groundwater flow simulation for geological discontinuities in the Unkheltseg Basin, Mongolia. Environ Earth Sci J 73(8):4119–4133
Yihdego Y, Becht R (2013) Simulation of lake–aquifer interaction at Lake Naivasha, Kenya using a three-dimensional flow model with the high conductivity technique and a DEM with bathymetry. J Hydrol 503:111–122
Carrera J, Alcolea A, Medina A, Hidalgo J, Slooten LJ (2005) Inverse problem in hydrogeology. Hydrogeol J 13:206–222
Yihdego Y, Webb JA (2011) Modeling of bore hydrograph to determine the impact of climate and land use change in a temperate subhumid region of south-eastern Australia. Hydrogeology Journal 19(4):877–887
Yihdego Y, Webb JA (2015) Use of a conceptual hydrogeological model and a time variant water budget analysis to determine controls on salinity in Lake Burrumbeet in southeast Australia. Environ Earth Sci J 73(4):1587–1600
Yustres A, Navarro V, Asensio L, Miguel Candel M, García B (2013) Groundwater resources in the Upper Guadiana (Spain): a regional modelling analysis. Hydrogeol J 21:1129–1146
Orr S, Meystel AM (2005) Approaches to optimal aquifer management and intelligent control in a multi-resolutional decision support system. Hydrogeol J 13:223–246
Danish International Development Agency (DANIDA) (1988) Implementation of water master plan for Iringa, Ruvuma and Mbaya regions, for United Republic of Tanzania
Don Consult Ltd (2011) Provision of technical and facilitation consultancy services for rural water supply and sanitation sub-projects in Kyela district council, exploration drilling report. Tender No: LW/DC/F. 10/15/Vol. V/108, July 2008. Report for the United Republic of Tanzania, Prime Minister’s Office Regional administration and Local Government, Water Sector Development Program
Kihila J, Mtei KM, Njau KN (2015) A review of the challenges and opportunities for water reuse in irrigation with a focus on its prospects in Tanzania. Int J Environ Eng 7(2):111–130. doi:10.1504/IJEE.2015.069817
SMEC (2013) Integrated water resources management and development plan—groundwater assessment. Ministry of Water, Dar es Salaam
Bootsma HA, Jorgensen SE (2006) Lake Malawi/Nyasa. Experience and lessons learned brief. http://Worldlakes.org. Accessed 25 March 2015
Kashaigili JJ (2010) Assessment of groundwater availability and its current and potential use and impacts in Tanzania, Report for International Water Management Institute, December 2010
Lake Nyasa Basin Water Board (LNBWB) (2010) Basin (Lake Nyasa) hydrological report, December 2010
Arnold JG, Allen PM, Muttiah R, Bernhardt G (1995) Automated baseflow separation and recession analysis techniques. Ground Water 33(6):1010–1018
Beck HE, Albert I, van Dijk JM, Miralles DG, de Jeu RAM, Bruijnzeel LA, McVica TR, Schellekens J (2013) Global patterns in baseflow index and recession based on stream flow observations from 3394 catchments. Water Resour Res 49(12):7843–7863
Smakhtin VU (2001) Estimating continuous monthly baseflow time series and their possible applications in the context of the ecological reserve. Water SA 27(2):213–218 (ISSN 0378–4738)
Howard AE (2011) A brief introduction to the geology and mining history of Tanzania. Report prepared for SIKA RESOURCES INC. Nebu Consulting LLC, Toronto
Hagedorn B, El-Kadi AI, Mair A, Whittier RB, Ha K (2011) Estimating recharge in fractured aquifers of a temperate humid to semiarid volcanic island (Jeju, Korea) from water table fluctuations, and Cl, CFC-12 and 3H chemistry. J Hydrol 409:650–662
HydroGeoLogic Inc (2002) MODFLOW-SURFACT: a comprehensive MODFLOW-based hydrologic modelling system: code documentation and user’s manual. HydroGeoLogic Inc, Reston
Sanz D, Castaño S, Cassiraga E, Sahuquillo A, Gómez-Alday J, Peña S, Calera A (2011) Modeling aquifer–river interactions under the influence of groundwater abstraction in the Mancha Oriental System (SE Spain). Hydrogeol J 19:475–487
Fetter CW (2001) Applied hydrogeology, 4th edn. Prentice Hall, Englewood Cliffs
Barnett B, Townley LR, Post V, Evans RE, Hunt RJ, Peeters L, Richardson S, Werner AD, Knapton A, Boronkay A (2012) Australian groundwater modelling guidelines, waterlines report. National Water Commission, Canberra
Knowling MJ, Werner AD, Herckenrath D (2015) Quantifying climate and pumping contributions to aquifer depletion using a highly parameterized groundwater model: Uley South Basin (South Australia). J Hydrol 523:515–530
Middlemis H (2004) Benchmarking best practice for groundwater flow modelling. The Winston Churchill Memorial Trust of Australia
Harbaugh AW (1990) Zone budget. A computer program for calculating subregional water budgets using results from the US geological survey modular three-dimensional ground-water flow model: US geological survey open-file report 90–392
Kalf FRP, Woolley DR (2005) Applicability and methodology of determining sustainable yield in groundwater systems. Hydrogeol J 13:295–312
Mair A, Hagedorn B, Tillery S, El-Kadi AI, Westenbroek S, Ha K, Koh GW (2013) Temporal and spatial variability of groundwater recharge on Jeju Island, Korea. J Hydrol 501:213–226
Fornés JM, De La Hera Á, Llamas MR (2005) The silent revolution in groundwater intensive use and its influence in Spain. Water Policy 7:253–268
Yihdego Y, Webb JA (2016) Validation of a model with climatic and flow scenario analysis: case of Lake Burrumbeet in southeastern Australia. J Environ Monit Assess 188(308):1–14. doi:10.1007/s10661-016-5310-7
Yihdego Y (2015) Water reuse and recreational waters, urban water reuse handbook (UWRH), chapter 78. In: Eslamian S. (ed) Taylor and Francis, CRC Press, Boca Raton, pp 1029-1039. Print ISBN: 978-1-4822-2914-1. eBook ISBN: 978-1-4822-2915-8. CAT# K22608. https://www.crcpress.com/Urban-Water-Reuse-Handbook/Eslamian/p/book/9781482229141