| dc.description.abstract | In a hydropower plant dam creates a reservoir storage. This storage space is directly linked with the sedimentation in the reservoir and sediment management strategies. Almost all of the new dams constructed now a days incorporate sediment management techniques during the time of designing and construction, but old dams may have not incorporated such strategies. Among various available approaches suitable strategy have to be selected inoder to preserve reservoir storage an get benefit from it. After selecting the sediment management strategies, it needs to be verified if it works in real world or not. Verification is generally done by two ways, physical model test and numerical test separately or combining.
This thesis work deals with Physical model-based investigation of sediment management strategies. Types of physical model, its scaling, designing of model, model effects and scale effects, similarities between flow parameters and sediment transport are studied in this report. Physical model can be used to conduct different types of experiment but this report focuses on sediment and its scaling effect in physical model.
From the pre-existing theories and literature materials, detailed review is done inorder to get all the relevant information about physical modelling and its practices. Result from the study is presented inside the report in tabular form with all available parameters related to sediment and scaling.
All these studies conducted are now implemented to the actual physical model development process. A hydropower plant in Asia is facing a huge problem due to reservoir sedimentation and various approaches are being tested for finding solution to the problem. There is a physical model construction ongoing in the NTNU laboratory for the same reservoir in Asia. The main concern of this report is about the type of sediment selection, scaling and maintaining the similitude between prototype and model. Sediments in suspension and bed are taken in consideration and roughly estimated model size, sediment size and various parameters are suggested on the basis of literature studies conducted.
As, whole thesis work is dependent on review of previous research and having the time constraints to view all previous work, most of the important aspects and studies are tried to over and many findings are based only on these limited studies. Suggested values and methods for solving the sedimentation problem for the reservoir in Asia may not be perfectly accurate but is done with the judgement and understanding level of the researcher. | |