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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 41753 (09)
- University: Sharif University of Technology
- Department: Civil Engineering
- Advisor(s): Abrishamchi, Ahmad
- Abstract:
- Hydrological models are suitable tools for reduction of hydrological uncertainty in stream flow estimation. There are different historical approaches for the development of rainfall-runoff models, with regard to the choice of model structure and the calibration of the parameters, but the most attention has been focused on gauged catchments where sufficient data, in particular stream flow data, are available. So new modeling strategies for ungauged or pseudo ungauged catchments have been developed. This work was aimed to develop a methodology for the regionalization of some parameters of a conceptual rainfall-runoff model based on measurable physiographic, meteorological and even land use/land cover characteristics of a catchment. The main reasons for use of this method are: firstly, traditional methods of estimating model parameters are based on calibration of the model against observed runoff. In the absence of such records, estimation of the model parameters would not be straightforward and therefore there should be a way to estimate them from some catchment attributes. Secondly, assessment of the hydrologic impact of changes in land use/land cover attributes of a catchment will be possible only if the changes in these attributes are reflected in the model parameters. To achieve this goal, regional structure of daily flow series and data homogeneity of catchments is investigated. Areal daily average data for each catchment such as precipitation and temperature is calculated and runoff of gauged catchments is simulated using HBV model. Finally the HBV model is applied to simulate daily stream flow in ungauged catchments with parameters transferred from gauged catchment by regionalization methods. The regionalization methods which are used in this study are based on hydrological similarity such as spatial proximity, catchment characteristics and flow duration curve (FDC). The data of three gauged catchments of Haraz, Talar and babol are selected as the case study. The results show that transferring HBV model parameters based on the FDC similarity criterion and then spatial proximity produce better runoff simulation compared to the catchment characteristics methods
- Keywords:
- Flow Duration Curve (FDC) ; Regionalization Method ; Hamiltonian Boundary Value (HBV)Rainfall-Runoff Model ; Ungauged Catchments ; Physical Characteristics Method ; Spatial Proximity Method
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