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Table AQ 4-23

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Table AQ 4-23. Sensitivity of River Model Parameters.

Parameters Calibration Parameter                            Sensitivity   Notes

               Manning n                                    High          Affects travel time, can affect phase of diurnal cycle/variation of water temperature.
   Flow
               Slope Factor                                 High          Affects travel time, can affect phase of diurnal cycle/variation of water temperature.

                                                                          Affects evaporative cooling. In this application, these coefficients had a modest impact
               A & B coefficients in evaporation equation   Medium
                                                                          on temperature.
                                                                          Reduces solar radiation, a principal component of the heat budget. The topographic
               Topographic Shade                            Low
                                                                          relief was not globally sufficient for this parameter to have a large effect.
                                                                          Reduces solar radiation, a principal component of the heat budget. The local shade
               Local Shade                                  Medium
                                                                          had a modest affect in certain reaches above Ralston Afterbay.

               Dead Pool Area (m2)                          Low           Affects diurnal variation of water temperature.
Temperature
               Terrestrial Long Wave (%)                    Low           Contributes slightly to heat budget.


               Terrestrial Emissivity                       Low           Contributes slightly to heat budget.

                                                                          A moderately sensitive parameter that affects both mean temperature and diurnal
               Bed Temperature (oC)                         Medium
                                                                          range. Seasonal values used in several reaches.
                                                                          A moderately sensitive parameter that affects both mean temperature and diurnal
               Bed Heat Exchange Coefficient (W/m 2/oC)     Medium
                                                                          range. Seasonal values used in several reaches.




 August 2010                                                              53

				
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