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تعداد نتایج: 152

Sustainable Irrigation Development in the White Volta sub-Basin

UNESCO-IHE PhD Thesis

By Eric Antwi Ofosu
Publisher: CRC Press, 2011-12-16
Pages: 282
Language: en
ISBN_13:9781466552821
ISBN_10:1466552824
Subject: Technology & Engineering

Sustainable Irrigation Development in the White Volta sub-Basin

UNESCO-IHE PhD Thesis

جزئیات و درخواست

By Eric Antwi Ofosu
Publisher: CRC Press, 2011-12-16
Pages: 282
Language: en
ISBN_13:9780415621038
ISBN_10:0415621038
Subject: Technology & Engineering

The Volta River Basin

Water for Food, Economic Growth and Environment

جزئیات و درخواست

By Timothy O. Williams, Marloes Mul, Charles A. Biney, Vladimir Smakhtin
Publisher: Routledge, 2016-09-19
Pages: 376
Language: en
ISBN_13:9781317479536
ISBN_10:131747953X
Subject: Nature

Water management for sustainable agriculture

جزئیات و درخواست

By Prof. T. Oweis
Publisher: Burleigh Dodds Science Publishing, 2018-07-09
Pages: 477
Language: en
ISBN_13:9781786761781
ISBN_10:1786761785
Subject: Technology & Engineering

Rainwater-Smart Agriculture in Arid and Semi-Arid Areas

Fostering the Use of Rainwater for Food Security, Poverty Al...

جزئیات و درخواست

By Walter Leal Filho, Josep de Trincheria Gomez
Publisher: Springer, 2017-12-28
Pages: 385
Language: en
ISBN_13:9783319662398
ISBN_10:3319662392
Subject: Science

Smallholder shallow groundwater irrigation development in the upper east region of Ghana

جزئیات و درخواست

Publisher: IWMI, 2011
Pages: 40
Language: en
ISBN_13:9789290907473
ISBN_10:9290907479

Hydro-political assessment of water governance from the top-down and review of literature on local level institutions and practices in the Volta Basin

جزئیات و درخواست

By Yaw Opoku-Ankomah, Youssouf Dembélé, Ben Y. Ampomah, Léopold Somé
Publisher: IWMI, 2006-07-07
Pages: 55
Language: en
ISBN_13:9789290906360
ISBN_10:9290906367
Subject: Volta River Watershed (Ghana)

Water Resources Assessment of the Volta River Basin

جزئیات و درخواست

By Marloes Mul, Emmanuel Obuobie, Richard Appoh, Kwabena Kankam- Yeboah, Emmanuel Bekoe-Obeng, Barnabas Amisigo
Publisher: International Water Management Institute (IWMI), 2015-02-01
Pages: 82
Language: en
ISBN_13:9789290908296
ISBN_10:9290908297
Subject: Technology & Engineering

Sustainable Use of Soils and Water

The Role of Environmental Land Use Conflicts

جزئیات و درخواست

By Fernando António Leal Pacheco
Publisher: MDPI, 2020-04-30
Pages: 332
Language: en
ISBN_13:9783039286447
ISBN_10:3039286447
Subject: Science

Water, Food and Poverty in River Basins

Defining the Limits

جزئیات و درخواست

By Myles Fisher, Simon Cook
Publisher: Routledge, 2013-09-13
Pages: 411
Language: en
ISBN_13:9781135724207
ISBN_10:1135724202
Subject: Science

Population and Land Use/Cover Dynamics in the Volta River Basin of Ghana, 1960-2010

جزئیات و درخواست

By Samuel Nii Adrey Codjoe
Publisher: Cuvillier Verlag, 2004-03-29
Pages: 196
Language: de
ISBN_13:9783736910386
ISBN_10:373691038X
Subject: Science

The Future Internet

Alternative Visions

جزئیات و درخواست

By Jenifer Winter, Ryota Ono
Publisher: Springer, 2015-12-14
Pages: 239
Language: en
ISBN_13:9783319229942
ISBN_10:331922994X
Subject: Computers

International Journal of Advanced Remote Sensing and GIS

Compilation from Volume 1 to Volume 9

جزئیات و درخواست

By Cloud Publications
Publisher: Cloud Publications, 2012-01-01
Pages: 3168
Language: en
Subject: Science

Hydrology and Water Law - Bridging the Gap

جزئیات و درخواست

By J. Wallace, Patricia Wouters
Publisher: IWA Publishing, 2006-04-30
Pages: 356
Language: en
ISBN_13:9781843390701
ISBN_10:1843390701
Subject: Science

Facing Global Environmental Change

Environmental, Human, Energy, Food, Health and Water Securit...

جزئیات و درخواست

By Hans Günter Brauch, Navnita Chadha Behera, Patricia Kameri-Mbote, John Grin, Úrsula Oswald Spring
Publisher: Springer Science & Business Media, 2009-06-04
Pages: 1546
Language: en
ISBN_13:9783540684886
ISBN_10:3540684883
Subject: Science

The Water Resource Implications of Changing Climate in the Volta River Basin

جزئیات و درخواست

By Matthew McCartney, Gerald Forkuor, Aditya Sood, Barnabas Amisigo, Fred Hattermann
Publisher: IWMI, 2012
Pages: 46
Language: en
ISBN_13:9789290907640
ISBN_10:9290907649

The Political Ecology of Household Water in Northern Ghana

جزئیات و درخواست

By Irit Eguavoen
Publisher: LIT Verlag Münster, 2008
Pages: 326
Language: en
ISBN_13:9783825816131
ISBN_10:3825816133
Subject: Business & Economics

Climate Vulnerability

Understanding and Addressing Threats to Essential Resources

جزئیات و درخواست

Publisher: Elsevier, 2013-03-15
Pages: 1086
Language: en
ISBN_13:9780123847041
ISBN_10:0123847044
Subject: Science

Hillslope and Watershed Hydrology

جزئیات و درخواست

By Christopher J. Duffy, Xuan Yu
Publisher: MDPI, 2018-09-14
Pages: 255
Language: en
ISBN_13:9783038429517
ISBN_10:3038429511
Subject: Science

Development of a water balance for the Atankwidi catchment, West Africa - A case study of groundwater recharge in a semi-arid climate

$Regolith aquifers in the weathered zone overlying Precambrian basement rocks serve as the main source of groundwater in a large part of the Volta River basin in West Africa. A prerequisite for sustainable groundwater resources management is the knowledge of recharge processes and the annual recharge rate. This research assesses the water balance, and in particular the groundwater recharge rate, for the Atankwidi catchment, a 275 km² sub-catchment of the White Volta in northern Ghana. Large uncertainties are typically inherent in any singular method to determine groundwater recharge. For this reason, an integrated approach is developed in this work which makes use of several field methods and combines results from these methods with water budget modeling. Field methods included in this approach are groundwater level observations, isotope analyses and a Chloride mass balance. The Atankwidi catchment falls within the semi-arid Sudan-Savanna climate zone. The climate is characterized by high temperatures and a single rainy season from May to October with an average annual rainfall of 990 mm. The hydrogeological system consists of three aquifers: The discontinuous, shallow aquifer, the regolith aquifer and the fracture aquifer. The principal aquifer is the regolith aquifer in the weathered mantle, which is usually targeted for drinking water supply. It forms a continuous aquifer with an average saturated thickness of 25 m and a hydraulic conductivity of 2.5E-6 to 2.5E-5 m/s. Recharge rates vary considerably between wet and dry years and between locations, with a range of 2 % to 13 % of annual rainfall. The long term recharge rate is determined by the Chloride mass balance to be approximately 6 % of average annual rainfall. The research emphasizes the importance of high rainfall intensities in creating groundwater recharge. Interannual comparison of water level fluctuations shows that a decrease in annual rainfall of 20 % causes a reduction of groundwater recharge of 30 % to 60 %. The impact of changing quantities of annual rainfall on groundwater recharge is overestimated by methods that do not account for infiltration by preferential flow. A long term average groundwater recharge of 60 mm/y compares to a total current groundwater abstraction of 4 mm/y in the study area, which is one of the areas with the highest groundwater use per km² in the Volta River basin. Recharge is therefore currently not a limiting factor for groundwater resources development. Water budget modeling using WaSIM-ETH calculates that 63 % of annual rainfall is lost to evapotranspiration in a wet year (2003), and 82 % in a dry year (2004). In the investigated mesoscale catchment 23 % and 11 % of annual rainfall end up as surface run-off in a wet year and a dry year, respectively. Approximately 40 % of surface run-off consists of interflow, while the main fraction is direct run-off. Base flow from groundwater is negligible. Groundwater flow in the regolith aquifer is modeled with Visual Modflow, assuming average hydraulic conductivities as determined by pumping test evaluation. The model calculatesthat only about 5 % of groundwater recharge leaves the basin as groundwater flow. This is evidence that the regolith aquifer does not contribute to a large extent to regional groundwater flow. Leakage to localized zones of high hydraulic conductivity of the fracture aquifer, which underlies the regolith aquifer, could act as a main sink of groundwater recharge. However, the exact location and hydraulic properties of fracture zones are largely unknown, so that the flux from the regolith aquifer to these fractures as well as the amount of flow through fractures is impossible to estimate at present. Pumping tests with observation wells to assess the specific yield, long-term pumping test at the basin outlet and a continuation of groundwater hydrograph recording at high temporal resolution could largely enhance the knowledge of hydraulic properties in the future. The groundwater model could then be improved and extended to gain certainty on the characteristics of groundwater flow.$

جزئیات و درخواست

By Nicola Martin
Publisher: Cuvillier Verlag, 2006-05-31
Pages: 187
Language: en
ISBN_13:9783736918856
ISBN_10:3736918852
Subject: Science

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