A comparative study of the application of two catchment models to the Babak River Basin Lombok Island - Indonesia

Kadarisman (1993) A comparative study of the application of two catchment models to the Babak River Basin Lombok Island - Indonesia. Masters thesis, Memorial University of Newfoundland.

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Abstract

A common problem in water resources planning in Eastern Indonesia, particularly in the Province of West Nusa Tenggara (NTB), is the lack of streamflow data. In general the available runoff data do not cover periods of more than one decade and are often insufficient for design purposes. Rainfall data, however, can have records that are two or three decades in length. To extend the length of the streamflow records, rainfall data may be transformed into streamflows using a catchment rainfall-runoff model. Two conceptual catchment models, the Tank Model and Mock's Model, are proposed for this transformation of rainfall into runoff. Both models require mean areal precipitation and evapotranspiration as inputs. The Tank Model requires daily inputs values, while Mock's Model requires monthly input values. Two variations of the Tank Model (configurations with three and four tank components) were studied. -- Three year data periods (1973-1975) were employed for calibration, and the subsequent three year periods (1976-1979) were used for verification. By a trial and error method, a set of parameters for the four component Tank Model were obtained and suggested for modelling daily runoff of the Babak River. The model with three tanks did not give a good representation of low flows. By the same method, a set of parameters for the Mock Model were obtained; these are considered satisfactory for monthly flow modelling. Mock's Model is considered suitable for preliminary water resources studies, where monthly time steps are appropriate. The choice of a suitable model varies with the purposes and the availability of data. Additional rain gauges in the basin are recommended to improve the results of the model. For basins located near the Babak River basin and for basins with similar catchment characteristics, the obtained parameters for both the Tank Model and Mock's Model can be used as initial values.

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