Essays about: "HEC-RAS"

Showing result 21 - 25 of 30 essays containing the word HEC-RAS.

  1. 21. Seasonal Variations of Manning’s Coefficient Depending on Vegetation Conditions in Tärnsjö, Sweden

    University essay from Uppsala universitet/Institutionen för geovetenskaper

    Author : Rūta Plakane; [2017]
    Keywords : Manning’s roughness coefficient; vegetation; HEC-RAS; Tärnsjö; uncertainty; rating curve; Manning råhetskoefficient; vegetation; HEC-RAS; Tärnsjö; osäkerhet; ratingkurva;

    Abstract : Hydrological models are used widely and they demand for multiple input variables and observations. One of those variables is Manning’s roughness coefficient. In the current literature the variability of the coefficient poses an unknown uncertainty. READ MORE

  3. 22. Sediment transport in Säveån and its implications for erosion and bank stability

    University essay from Lunds universitet/Avdelningen för Teknisk vattenresurslära

    Author : Gasper Sechu; [2015]
    Keywords : HEC-RAS; sediment transport; erosion; bank stability; climate change; Earth and Environmental Sciences;

    Abstract : This master thesis study is a preliminary investigation of the Säveån River as part of the Swedish Geotechnical Institute’s (SGI) landslide risk assessment project. The main objectives include building a hydrodynamic model for the river, estimating sediment transport along the river, assessing the implications for erosion and bank stability and evaluating climate change effects on sediment transport. READ MORE

  4. 23. Sensitivity of sediment transport on river characteristics in the large, braided Brahmaputra River

    University essay from Stockholms universitet/Institutionen för naturgeografi

    Author : Sandra Fischer; [2015]
    Keywords : Brahmaputra; Braided river; sediment transport;

    Abstract : Erosional issues in the Brahmaputra River in the eastern Himalayas pose increasing pressure on the nearby societies and ecosystems. With a proceeding climate change and increasing anthropogenic disturbance, predictive models are needed to evaluate the effect on sediment transport. READ MORE

  5. 24. Study on the Dynamic Control of Dam Operating Water Levels of Yayangshan Dam in Flood Season

    University essay from KTH/Industriell ekologi

    Author : Jenny Bramsäter; Kajsa Lundgren; [2015]
    Keywords : Yayangshan; Flood routing calculation; Backwater computation; HEC-RAS;

    Abstract : Water levels up- and downstream of dams are strongly affected by water levels in the reservoir as well as the discharge of the dam. To ensure that no harm comes to buildings, bridges or agricultural land it is important to ensure that the water level in the reservoir is adjusted to handle large floods. READ MORE

  6. 25. Optimization of Physical Properties for Ditches–Case Study: Kankberg, Maurliden and Renström-Petiknäs.

    University essay from KTH/Mark- och vattenteknik

    Author : Ghebriel Kidane Ketema; [2014]
    Keywords : Drainage system; Ditches; Open channel flow; Steep slope; Mild slope; HEC-RAS; Super-critical flow; Critical flow; Sub-critical flow;

    Abstract : It is important for practical and legal reasons that water and sediments in disturbed areas around the mining operation should be controlled. The construction of a well-designed drainage system that controls erosion and thus restores the proper hydraulic function of the surface is one of the most important post-disturbance features which should be done as part of the mining activities. READ MORE