muna mirghani

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Armando Marques-Guedes

UNL - New University of Lisbon

Hacettepe University

Middlesex University

Anadolu University

Istanbul University

University of Oulu

Ankara University

Ankara Yildirim Beyazit University

Tolga Akay

Kafkas University

Süleyman Nihat ŞAD

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Papers by muna mirghani

Konzepte und Modelle für die Charakterisierung des hydrogeologischen Systems im Gebiet West Gedaref im Sudan

Das Ziel der Forschungsarbeit war es, Konzepte und Techniken anzuwenden, die mit wenigen Daten ei... more Das Ziel der Forschungsarbeit war es, Konzepte und Techniken anzuwenden, die mit wenigen Daten eine Beschreibung des Grundwassersystems im Gebiet West Gedaref im Sudan ermöglichen und dieses zu verstehen. Um Schätzungen der lokalen hydraulischen Eigenschaften und die hydrogeologischen Bedingungen zu Erfassen, wurden klassische quantitative Methoden der Hydrogeologie angewendet. Um den Grundwasserleiter räumlich zu beschreiben, wurden Modelle benutzt, bei denen die Konfiguration der heterogenen hydraulischen Parameter T und S, der hydraulische Grundwasserstand sowie die Grundwasserneubildungs-kinetik des Grundwasserleiters variiert wurden.. Nach den deterministischen und stochastischen Annäherungen wurde ein Begriffsrahmen für die Analyse definiert. Im Gegenteil zum Konzept der eindeutigen Parameter, wurden geostatistische Methoden angewandt die auf der Zufallsfunktionskonzeption basieren, das mehrfache Realisierungen erlaubt. Die Zufallsfunktionshypothese ließ die Kennzeichnung des ...

QDF Relationships for Low Flow Return Period Prediction

For sustainable development of the Nile Basin, an integrated water management approach encompassi... more For sustainable development of the Nile Basin, an integrated water management approach encompassing environmental considerations such as drought impacts is crucial. Drought has extensively affected the region and left clear impacts on the planned development. This paper contributes to the assessment of drought impact on the Nile low flows using low flow – duration – frequency (QDF) relationships and curves. QDF modeling uses a multi-duration and multi-frequency description of observed low flows. Low flows are analyzed at one key station on the Blue Nile in Sudan, and at a station on river Nzoia upstream of Lake Victoria in Kenya. Low -flow frequency analysis is performed by first selecting probability distributions to describe low flow minima for different aggregation periods in the range from 1 day to 2 years. Relationships between the parameters of these distributions and the aggregation periods are thereafter analyzed and parameterized. QDF relations are then established, which c...

Strengthening Institutions and Stakeholders Capacity for IWRM in the Nile Region

Groundwater management in IWRM : training manual

Groundwater is vital to many nations, Worldwide some 2 billion people, innumerable farmers and ma... more Groundwater is vital to many nations, Worldwide some 2 billion people, innumerable farmers and many industrial premises depend on it for their water supply. Accelerated development over the past few decades has resulted in great social and economic benefits, by providing low-cost, drought-reliable and high-quality water supplies for both the urban and rural population and for irrigation of crops. Practical advances are urgently needed; there is no simple blueprint for action, due to the inherent variability of groundwater systems and related socio-economic situations. Many developing nations need to appreciate their socioeconomic dependency on groundwater, and invest in strengthening institutional provisions and building institutional capacity for its improved management before it is too late. Traditional institutional separation of surface water from groundwater has created fundamental communication barriers that now extend from technical expertise to policy developers, operational...

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Concepts and Models for the Characterization of the West Gedaref Hydrogeologic System, Sudan

Drainage……………………………………………………………………….…….25 1. Introduction Currently, the city of Gedaref alone de... more Drainage……………………………………………………………………….…….25 1. Introduction Currently, the city of Gedaref alone demands 25,000 m 3 /d. The current supply is about 6000 m 3 /d from the wellfields west of Gedaref, and 10,000 m 3 /d from river Atbara 70 km east of the city, available only during the flood season, July-October. This indicates a wide gap in Water supply during the dry summer period, March to June. Due to the seasonal nature and high cost of the surface water source, attention is directed towards groundwater development.

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A Conceptual Framework for Modeling the West Gedaref Sandstone Aquifer

In this paper a model concept is set up for the simulation of the aquifer system in the over-pump... more In this paper a model concept is set up for the simulation of the aquifer system in the over-pumped well fields west of the Gedaref city. Assumptions are made on different system elements that would ultimately be confirmed by numerical simulation. Prior estimates of system parameters as well as calibration targets are established to measure confidence on the model results. A typical modeling process starts with data integration and description of the hydrogeological setup, then the definition of the conceptual framework for analysis, and finally comes the numerical approximation. The conceptual framework represents an important phase in defining the quantitative framework within which a numerical scheme works. It identifies and specifies the different steps, which can be taken in the process of formulating, analysis, evaluating and presenting alternative models (KOUDSTAAL, 1992). According to SUN (1994) application of sound hydrologic reasoning during the development of an appropria...

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A Conceptual Framework for Modeling the West Gedaref Sandstone Aquifer

Groundwater management in IWRM : training manual

Groundwater Management Practices in Darfur State, Situation Analysis

Statistical Analysis of Dry Periods in Seasonal Rivers

As drought impact indicators, discharges at two stations on the Nile system inside Sudan are cons... more As drought impact indicators, discharges at two stations on the Nile system inside Sudan are considered for analysis. The main objective of the paper is to infer low flow frequency distributions using independent low flow discharges and quantile plots; as a first step to the regionalization of low flow frequency estimates that ultimately contribute to sustainable management of the Nile water resources. The extraction of independent low flow discharges is done based on numerical techniques used for baseflow filtering and for splitting the discharge series into independent low flow events. The latter is done based on a pre-specified independency criterion. Low flow frequency distributions are obtained at the selected stations and presented as return-period curves and low flow quantiles. The fitting of extreme-value distributions to low flows was done based on methodologies used for flood fr equency analysis, after transforming the discharges Q by 1/Q. Being seasonal, low -flows at the...

Water and Food Security in the Nile Basin: Climate Change from Policy to Implementation

The potential of Bara groundwater system for the supply of the Obeid City – A numerical simulation model

The scope of this study is to check the sustainability of Bara Well field to satisfy future drink... more The scope of this study is to check the sustainability of Bara Well field to satisfy future drinking water needs for El Obeid City in Kordufan State, western Sudan. The main tasks involved can be summarized as: 1. Data compilation and digital processing in suitable formats 2. Data synthesis & Interpretation using gridding tools 3. Developing conceptual models 4. Use available software for mathematical simulation of the basin 5. Prediction of sustainable abstractions under various scenarios 6. Delineation of capture zone of the wellfield and associated drawdown of piezometric surface, vertical leakage & lateral flow pattern The modeling was performed in two phases. In the first phase, a large, regional scale model is constructed and the model is extended to well-defined boundaries. During the second stage, a second, smaller, local scale model is constructed that occupies a small area within the regional model. Head and layer data were interpolated from the regional to the local model...

Status of IWRM Planning and Implementation in Sudan 2008

Making IWRM relevant: Benchmarking the water sector in Sudan for sustainable reforms

Groundwater Management in the Eastern Nile Basin Organization

Incorporation of people's participation in planning and implementation of water resources projects

Physics and Chemistry of the Earth, 1995

Statistical Analysis of Dry Periods in Seasonal Rivers

A CONCEPTUAL FRAMEWORK FOR MODELING THE WEST GEDAREF SANDSTONE AQUIFER

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Incorporation of people's participation in planning and implementation of water resources projects

Physics and Chemistry of The Earth, 1995

Although many water resources projects are technically and economically successful, they have enl... more Although many water resources projects are technically and economically successful, they have enlarged inequality by failing to reach and to benefit the poor. More importantly, owing to lack of attention to both maintenance and operation, they fail to be sustainable in the long term. These problems may be overcome by applying the techniques of People's Participation (PP) to the planning and implementation of the project. When PP is applied to rural water resources projects, the initial emphasis should be on stakeholders' participation. This participation should not be limited to the implementation activities and the sharing of benefits, but should be considered at the very start of the project during problem identification and analysis. Maximising participation is an important element in socioeconomic development and integrated water resources management. A project is only sustainable to the extent that it has the support of a broad base of stakeholders, thereby opening up the possibilities both to strengthen local institutions and people's organisations and to develop self-reliance and confidence.