Search for dissertations about: "Bijan Dargahi"

Showing result 1 - 5 of 6 swedish dissertations containing the words Bijan Dargahi.

  2. 1. Internal Erosion Phenomena in Embankment Dams : Throughflow and internal erosion mechanisms

    Author : Farzad Ferdos; Anders Wörman; Bijan Dargahi; Fredrik Johansson; Willi Hager; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Internal erosion modelling in porous material; Constitutive law of erosion for closure of continuum-mechanics-based balance equations for numerical modelling; High Reynolds-number turbulent flow; Flow laws; Coarse rockfill material throughflow; Computational Fluid Dynamics.; Civil and Architectural Engineering; Byggvetenskap;

    Abstract :  In this study, two major internal erosion initiation processes, suffusion and concentrated leak mechanisms, which lead to both defect formation in a dam’s body and its foundation and high throughflow in dams subjected to internal erosion were studied. This understanding has the potential to facilitate numerical modelling and expedite dam safety assessment studies. READ MORE

  4. 2. Modeling flow and sediment transport in water bodies and watersheds

    Author : Muluneh Admass Mekonnen; Bijan Dargahi; Anders Wörman; Hans Bergh; Edward Buchak; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Bed load transport model; ECOMSED; Hydrology; Hydrodynamics; Spectral Analysis; SWAT; Water engineering; Vattenteknik;

    Abstract : The research focus is on the various modeling aspects of flow and sediment transport in water bodies and watersheds. The interaction of flow with a mobile bed involves a complex process in which various turbulent scales characterized by coherent structures cause a chaotic sediment motion. READ MORE

  5. 3. Using LiDAR to model rating curves

    Author : Marcus Nathanson; Steve Lyon; Bijan Dargahi; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Physical Geography; naturgeografi;

    Abstract : .... READ MORE

  6. 4. Hydrological and sediment yield modelling in Lake Tana Basin, Blue Nile Ethiopia

    Author : Shimelis Gebriye Setegn; Bijan Dargahi; Anders Wörman; C. Green Rossi; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; SWAT; Lake Tana; Blue Nile; hydrological modelling; watershed modelling; MCE; SUFI-2; GLUE; ParaSol; streamflows; sediment yield; erosion; water balance; model calibration; Hydrology; Hydrologi;

    Abstract : Land and water resources degradation are the major problems on the Ethiopian highlands. Poor land use practices and improper management systems have played a significant role in causing high soil erosion rates, sediment transport and loss of agricultural nutrients. So far limited meas-ures have been taken to combat the problems. READ MORE

  7. 5. Modelling Hydrological and Hydrodynamic Processes in Lake Tana Basin, Ethiopia

    Author : Shimelis Gebriye Setegn; Bijan Dargahi; Nicola Fohrer; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Lake Tana; Climate Change; SWAT; Hydrological Modeling; Hydrodynamic; GEMSS; MCE; Streamflow; Sediment yield; Hydrology; Hydrologi; Water engineering; Vattenteknik;

    Abstract : Lake Tana Basin is of significant importance to Ethiopia concerning water resources aspects and the ecological balance of the area. The growing high demands in utilizing the high potentials of water resource of the Lake to its maximal limit, pictures a disturbing future for the Lake. READ MORE