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LudekStr

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  1. GSSHA - G&A multilayer issues

    Thanks for your reply! I installed a brand new version ow WMS only last week, when I found out that there's been a fix of multi-layer routine in GSSHA. What I did is that I took the old project using G&A with redistribution and tested it on the new WMS release. It worked perfectly fine as the old one did. Then I switched in the Job Control to G&A multilayer routine. The mapping table dissapeared, so I refilled it with the same parameters (there were some changes in order of parameters, but I reflected it). I assigned the same parameters for every one of all three layers, including the same depth of the layers 100 cm. ?? It just occured to me - is the parameter "depth" supposed to mean "thickness" of the layer or is it the depth of the interface where the layer starts/ends? As you suggested I checked the parameters whether they fulfill resid < wilting Pt < FC < porosity and I had it right. Only the initial moisture was higher then the FC (still lower than porosity), as I need to reflect the antecendent rainfall. For this setup the model responded with very sharp and high peaks, they don't seem to correspond to peaks in the hyetograph and the model doesn't have any troubles to produce even higher volume of discgarge than was the precipitation total either. The output is very sensitive to the timestep, I tried several options between 2 min and 15 seconds, but the character of output is always the same - up to 100x higher and sharp peak discharges comparing to G&A redistrib. routine. Ludek S. ************************************************************************************************************************************* In case you'd like to see the mapping table: ID DESCRIPTION1 DESCRIPTION2 HYDR_COND CAPIL_HEAD POROSITY PORE_INDEX RESID_SAT FIELD_CAPACITY WILTING_PT 1 8, sand 7, arrable land 21.282600 4.950000 0.437000 0.694000 0.020000 0.090000 0.033000 2 8, sand 4, gardens 21.282600 4.950000 0.437000 0.694000 0.020000 0.090000 0.033000 3 6, sandy loam 8, impervious 0.000010 11.010000 0.453000 0.378000 0.041000 0.207000 0.095000 4 6, sandy loam 4, gardens 3.359100 11.010000 0.453000 0.378000 0.041000 0.207000 0.095000 5 8, sand 3, meadow 21.282600 4.950000 0.437000 0.694000 0.020000 0.090000 0.033000 6 6, sandy loam 7, arrable land 3.359100 11.010000 0.453000 0.378000 0.041000 0.207000 0.095000 7 8, sand 8, impervious 0.000010 4.950000 0.437000 0.694000 0.020000 0.090000 0.033000 8 6, sandy loam 1, forests 3.359100 11.010000 0.453000 0.378000 0.041000 0.207000 0.095000 9 5, loam 4, gardens 1.120000 8.890000 0.463000 0.252000 0.027000 0.270000 0.117000 10 5, loam 8, impervious 0.000010 8.890000 0.463000 0.252000 0.027000 0.270000 0.117000 11 6, sandy loam 3, meadow 3.359100 11.010000 0.453000 0.378000 0.041000 0.207000 0.095000 12 7, loamy sand 7, arrable land 6.280000 6.130000 0.437000 0.553000 0.035000 0.125000 0.055000 13 5, loam 7, arrable land 1.120000 8.890000 0.463000 0.252000 0.027000 0.270000 0.117000 14 5, loam 2, bushes 1.120000 8.890000 0.463000 0.252000 0.027000 0.270000 0.117000 15 5, loam 3, meadow 1.120000 8.890000 0.463000 0.252000 0.027000 0.270000 0.117000 16 6, sandy loam 2, bushes 3.359100 11.010000 0.453000 0.378000 0.041000 0.207000 0.095000 17 7, loamy sand 3, meadow 6.280000 6.130000 0.437000 0.553000 0.035000 0.125000 0.055000 18 1, clay 3, meadow 0.060000 31.630000 0.475000 0.165000 0.090000 0.396000 0.272000 19 1, clay 4, gardens 0.060000 31.630000 0.475000 0.165000 0.090000 0.396000 0.272000 20 8, sand 1, forests 21.282600 4.950000 0.437000 0.694000 0.020000 0.090000 0.033000 21 1, clay 7, arrable land 0.060000 31.630000 0.475000 0.165000 0.090000 0.396000 0.272000 22 5, loam 1, forests 1.120000 8.890000 0.463000 0.252000 0.027000 0.270000 0.117000 23 7, loamy sand 1, forests 6.280000 6.130000 0.437000 0.553000 0.035000 0.125000 0.055000 24 3, silty clay loam 7, arrable land 0.200000 27.300000 0.471000 0.177000 0.040000 0.366000 0.208000 25 1, clay 1, forests 0.060000 31.630000 0.475000 0.165000 0.090000 0.396000 0.272000 26 1, clay 6, water bodies 0.000010 31.630000 0.475000 0.165000 0.090000 0.396000 0.272000 27 6, sandy loam 6, water bodies 0.000010 11.010000 0.453000 0.378000 0.041000 0.207000 0.095000 28 3, silty clay loam 1, forests 0.200000 27.300000 0.471000 0.177000 0.040000 0.366000 0.208000 29 3, silty clay loam 3, meadow 0.200000 27.300000 0.471000 0.177000 0.040000 0.366000 0.208000 30 7, loamy sand 8, impervious 0.000010 6.130000 0.437000 0.553000 0.035000 0.125000 0.055000 31 7, loamy sand 4, gardens 6.280000 6.130000 0.437000 0.553000 0.035000 0.125000 0.055000 32 3, silty clay loam 2, bushes 0.200000 27.300000 0.471000 0.177000 0.040000 0.366000 0.208000 33 1, clay 8, impervious 0.000010 31.630000 0.475000 0.165000 0.090000 0.396000 0.272000 34 3, silty clay loam 4, gardens 0.200000 27.300000 0.471000 0.177000 0.040000 0.366000 0.208000 35 4, sandy clay loam 1, forests 0.300000 21.850000 0.398000 0.319000 0.068000 0.255000 0.148000 36 4, sandy clay loam 7, arrable land 0.300000 21.850000 0.398000 0.319000 0.068000 0.255000 0.148000 37 4, sandy clay loam 3, meadow 0.300000 21.850000 0.398000 0.319000 0.068000 0.255000 0.148000 38 3, silty clay loam 8, impervious 0.000010 27.300000 0.471000 0.177000 0.040000 0.366000 0.208000 39 8, sand 2, bushes 21.282600 4.950000 0.437000 0.694000 0.020000 0.090000 0.033000 40 1, clay 5, marches 0.000010 31.630000 0.475000 0.165000 0.090000 0.396000 0.272000 41 1, clay 2, bushes 0.060000 31.630000 0.475000 0.165000 0.090000 0.396000 0.272000 42 4, sandy clay loam 2, bushes 0.300000 21.850000 0.398000 0.319000 0.068000 0.255000 0.148000 43 4, sandy clay loam 4, gardens 0.300000 21.850000 0.398000 0.319000 0.068000 0.255000 0.148000 44 4, sandy clay loam 8, impervious 0.000010 21.850000 0.398000 0.319000 0.068000 0.255000 0.148000 45 7, loamy sand 2, bushes 6.280000 6.130000 0.437000 0.553000 0.035000 0.125000 0.055000 *****************************************************************************************************************************************
  2. 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
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