Modelling the discharge of the Cidanau River in West Java with the HBV model

Brink, F. van den (2009) Modelling the discharge of the Cidanau River in West Java with the HBV model.

Abstract:Water quantity problems in rivers such as droughts and floods occur quite intermittently in Indonesia, in particular on Java, and cause economical, human and environmental problems. These problems are difficult to solve, due to the lack of knowledge. The Cidanau River, situated on Java, Indonesia, is important for the economical development of the region, because it is the only river in its surrounding (Banten province) with an adequate discharge to make the water economical exploitable using a small dam. The prediction of the discharge with the HBV model may help to make this water exploitation efficient. Furthermore it is helpful to use this model as a benchmark model for the development of a more physically based model, which will quantify the groundwater level besides the discharge. Therefore the objective of this research is to predict the discharge of the Cidanau River with the HBV model to obtain a benchmark model so that outcomes of the in the future developed physically-based model can be compared. In this research a simplified version of the HBV model has been used. For this conceptual hydrological model nine years of daily data about rainfall and evapotranspiration are used as input for the model. Furthermore, seven calibration parameters need to be calibrated with discharge data over the same period. The result is a sound prediction of the discharge. During extreme discharges the errors are relatively high. For the low water periods errors are caused by a constant base flow. On the other hand, the spatially averaged rainfall may not properly represent the rainfall in the area during high rainfall events, causing an underestimation of the high discharge peeks. For further research it is recommended to investigate the meaning of the values of calibration constants. The values of some of the calibration constants appear to be largely different from other studies. This difference may be caused by the large retention capacity of the area, which mainly consist of paddy fields and swampy area. Further the discharge data may be biased by an inconvenient location of discharge measurement. Because the discharge is measured just in front of the dam, high peeks in the discharge are measured delayed due to the retaining effect of the dam upstream. It is also recommended for further research to use an automatic calibration in stead of calibrating manually to prevent converging to a local in stead of a global optimum.
Item Type:Essay (Bachelor)
Faculty:ET: Engineering Technology
Subject:56 civil engineering
Programme:Civil Engineering BSc (56952)
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