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  1. GSSHA - G&A multilayer issues

    Recently I've been experiencing issues trying to implement more soil layers into my model. The model which worked fine with classic G&A redistribution infiltration routine suddenly produces weird results with G&A multilayer routine. The only change I made was switching to multilayer routine and assigning the depth of all layers. No matter what the depth was, disregarding any less permeable second layer I tried to introduce - the model always produces the same hydrograph with the peak as much as 20x higher then before and much faster response to all precipitation pulses. Moreover, when I tried to assign less permeable parameters to all layers, the peaks reached astronomic values, the model responded with NEGATIVE infiltration and the discharge volume reached about 200% of precipitation total. Does anyone has similar experience and/or suggestions, what went wrong? I suspect there's a numeric calculation bug inside :-) Thx Ludek S. CTU Prague