دانلود کتاب خارجی - دانلود رایگان کتاب لاتین PDF علمی

تعداد نتایج: 3586

Soil characterization and modeling of spatial distribution of saturated hydraulic conductivity at two sites in the Volta Basin of Ghana

By Wilson Agyei Agyara
Publisher: Cuvillier Verlag, 2004-06-09
Pages: 211
Language: de
ISBN_13:9783736911000
ISBN_10:3736911009
Subject: Science

Evapotranspiration and complimentarity relations in the water balance of the Volta Basin: Field measurements and GIS-based regional estimates

جزئیات و درخواست

By Philip Gbenro Oguntunde
Publisher: Cuvillier Verlag, 2004-09-20
Pages: 187
Language: de
ISBN_13:9783736912250
ISBN_10:3736912250
Subject: Science

Diversity and Ecology of Mountain Bamboos in the Shennongjia National Reserve of Central chiana

Implications for Resource Management and Biodiversity Conser...

جزئیات و درخواست

By Zhaohua Li
Publisher: Cuvillier Verlag, 2003-05-21
Pages: 177
Language: de
ISBN_13:9783736907270
ISBN_10:3736907273
Subject: Science

Ecophysiological diversity of wild Arabica coffee populations in Ethiopia: Growth, water relations and hydraulic characteristics along a climatic gradient

جزئیات و درخواست

By Taye Kufa Obso
Publisher: Cuvillier Verlag, 2006-10-09
Pages: 331
Language: en
ISBN_13:9783736929906
ISBN_10:3736929900
Subject: Science

Growth and Ecosystem Services of Urban Trees

جزئیات و درخواست

By Thomas Rötzer
Publisher: MDPI, 2019-10-23
Pages: 170
Language: en
ISBN_13:9783039215928
ISBN_10:3039215922
Subject: Science

Tropentag 2023 International Research on Food Security, Natural Resource Management and Rural Development

Competing pathways for equitabl food systems transformation:...

جزئیات و درخواست

By Eric Tielkes
Publisher: Cuvillier Verlag, 2023-09-15
Pages: 843
Language: en
ISBN_13:9783736968806
ISBN_10:3736968809

Upscaling of Land Surface Parameters Through Inverse-SVAT Modeling

جزئیات و درخواست

By Joseph D. Intsiful
Publisher: Cuvillier Verlag, 2004
Pages: 195
Language: en
ISBN_13:9783865371744
ISBN_10:3865371744

Tropentag 2010

World food system - A contribution from Europe

جزئیات و درخواست

By Eric Tielkes
Publisher: Cuvillier Verlag, 2010-08-19
Pages: 658
Language: en
ISBN_13:9783736934559
ISBN_10:3736934556
Subject: Science

Tropentag 2017

Future Agriculture: Socio-ecological transitions and bio-cul...

جزئیات و درخواست

By Eric Tielkes
Publisher: Cuvillier Verlag, 2017-08-28
Pages: 605
Language: en
ISBN_13:9783736986121
ISBN_10:3736986122
Subject: Science

Tropentag 2011

Development on the margin

جزئیات و درخواست

By Eric Tielkes
Publisher: Cuvillier Verlag, 2011-09-20
Pages: 638
Language: en
ISBN_13:9783736938793
ISBN_10:3736938799
Subject: Science

The assessment of tree species and irrigation techniques for afforestation of degraded agricultural landscapes in Khorezm, Uzbekistan, Aral Sea Basin

جزئیات و درخواست

By Asia Khamzina
Publisher: Cuvillier Verlag, 2006-05-03
Pages: 165
Language: en
ISBN_13:9783736918450
ISBN_10:3736918453
Subject: Science

Tropentag 2016

Solidarity in a competing world - fair use of resources

جزئیات و درخواست

By Bernhard Freyer, Eric Tielkes
Publisher: Cuvillier Verlag, 2016-08-25
Pages: 641
Language: en
ISBN_13:9783736983410
ISBN_10:3736983417
Subject: Social Science

Land use and land cover study of the savannah ecosystem in the Upper West Region (Ghana) using remote sensing

جزئیات و درخواست

By Stephen Edem Korbla Duadze
Publisher: Cuvillier Verlag, 2004-03-29
Pages: 256
Language: en
ISBN_13:9783736910416
ISBN_10:373691041X
Subject: Social Science

Proceedings

Georg-August-University of Goettingen (September 19 - 23, 20...

جزئیات و درخواست

By Daniel Stietenroth
Publisher: Universitätsverlag Göttingen, 2005
Pages: 223
Language: en
ISBN_13:9783938616208
ISBN_10:3938616202

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

Forest Conversion, Soil Degradation, Farmers' Perception Nexus

Implications for Sustainable Land Use in the Southwest of Et...

جزئیات و درخواست

By Mekuria Argaw Denboba
Publisher: Cuvillier Verlag, 2005
Pages: 181
Language: en
ISBN_13:9783865374448
ISBN_10:3865374441
Subject: Soil conservation

The impact of savannah vegetation on the spatial and temporal variation of the actual evapotranspiration in the Volta Basin, Navrongo, Upper East Ghana

جزئیات و درخواست

By Halidou Compaoré
Publisher: Cuvillier Verlag, 2006-03-01
Pages: 167
Language: en
ISBN_13:9783736918054
ISBN_10:3736918054
Subject: Science

Coping with Global Environmental Change, Disasters and Security

Threats, Challenges, Vulnerabilities and Risks

جزئیات و درخواست

By Hans Günter Brauch, Úrsula Oswald Spring, Czeslaw Mesjasz, John Grin, Patricia Kameri-Mbote
Publisher: Springer Science & Business Media, 2011-02-03
Pages: 1816
Language: en
ISBN_13:9783642177767
ISBN_10:364217776X
Subject: Science

Montane rainforest with wild Coffea arabica in Bonga region (SW Ethiopia): plant diversity, wild coffee management and implications for conservation

جزئیات و درخواست

By Christine B. Schmitt
Publisher: Cuvillier Verlag, 2006-10-30
Pages: 189
Language: en
ISBN_13:9783736920439
ISBN_10:3736920431
Subject: Science

Spatial Variability of Soils on National and Hillslope Scale in Uganda

جزئیات و درخواست

By Gerd Robert Rücker
Publisher: Cuvillier Verlag, 2005
Pages: 189
Language: en
ISBN_13:9783865373441
ISBN_10:3865373445
Subject: Slopes (Soil mechanics)

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