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<br />J. LAVABRE ET AL.
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<br />HYDROLOGICAL RESPONSE OF A MEDITERRANEAN BASIN
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<br />
<br />APPENDIX: A BRIEF DESCRIPTtON OF THE OR3 MOOEL
<br />(From Sempere Torres, 1992a)
<br />
<br />Although it is not our aim to describe fully the OR3 model (see for instance
<br />Michel, 1983; Michel, 1989; Editjano and Michel, 1989; Servat and Dezeiter,
<br />1991; Loumagne et aI., 1991), we thought it would be interesting to review its
<br />main points briefly.
<br />GR3 is a lumped conceptual model proposed by Michel (1983) based on the
<br />work of Cormary and Guilbot (1973). It is a two-reservoir model that needs
<br />to calibrate only two or three parameters depending on the time step that is
<br />used. It is the reference rainfall-runoff model used in the CEMAGREF
<br />studies. In our work we used it with a monthly and a daily time step.
<br />Essentially the model is the same, but the daily version introduces some small
<br />modifications to fit daily hyetographs beller.
<br />First we will summarize the general description and afterwards we will
<br />describe the modifications used in the daily time step version.
<br />GR3 is made up of two reservoirs (see Fig. AI): the soil moisture reservoir
<br />and the routing reservoir. The storage of the soil moisture reservoir, S,
<br />controls the evapotranspiration losses and therefore the portion of water that
<br />will constitute the runoff. Its maximal storage, A, is the first parameter of the
<br />model. The routing reservoir controls the outflow, Q, which is a monotonic
<br />function of its storage R. Its maximal storage, B. is the second parameter of
<br />the model.
<br />As inputs, G R3 needs precipitation, P, and potential evapotranspiration,
<br />E. during the time step considered (we used interannual means of the evapo-
<br />transpiration measured at the next meteorological station in our case study).
<br />Depending on whether the difference P' = P - E is less or greater than zero,
<br />there will be two cases:
<br />(I) If P' < 0, there will be a loss due to evapotranspiration. In this case the
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