Scientific Investigations Report 2006–5318
U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2006–5318
masbal_dpm.f
Accumulate daily HRU budget items and calculate daily, monthly, and annual averages for the modeled area as a whole.
Module accumulates daily HRU budget items and calculates daily, monthly, and annual averages for the modeled area. If observed discharge data are being used, then the last part of the module makes adjustments based on results from module runtru_dpm.f, which apportions observed discharge and recalculates recharge. Runtru_dpm.f is called after the process loop and therefore need to recalculate the basin averages of the affected water-budget items. These adjustments are not made in this module if there is no observed data input (nobs=0). The module is based on Bauer and Vaccaro (1987)
July, 2004
dsum
Check to determine if outputting daily water-budgets (<1 then no daily water budget), no units.
qbaldy
Daily water balance for the modeled area, in inches.
qbalmo
Monthly water balance for the modeled area, in inches.
qbalyr
Annual water balance for the modeled area, in inches.
wght
HRU area as fraction of total area, as a fraction. [basin]
tavf
Daily average temperature for each of the HRUs, in degrees. [grid]
hru_rototal
Total runoff for a HRU from Darcy flow and excess water, in inches. [runoff]
hru_chnginter
Change in intercepted water from yesterday day, in inches. [intrcp]
hru_ppt
Daily precipitation for each of the HRUs, in inches. [grid]
hru_potet
Potential evapotranspiration for HRU, in inches. [potet]
hru_rechrge
Calculated recharge-water leaving bottom of the root zone, in inches. [runoff]
hru_obsdisch
Apportioned observed surface runoff based on calculated runoff, in inches. [runtru]
hru_lakestor
PET for lakes for the case of no observed surface runoff or its = 0.0, in inches. [runoff]
hru_pevsoil
Potential evaporation demand for soil evaporation, in inches. [soilev]
hru_actevsoil
Actual evaporation from upper 1 foot of the soil column, in inches. [soilev]
hru_petcrop
Potential plant transpiration adjusted for crop growth, in inches. [plantet]
hru_aetplnt
Actual plant transpiration, in inches. [plantet]
hru_chngsm
Total change in soil moisture (saturated and unsaturated), in inches. [soilms]
hru_chngsno
Change in snowpack for this day for HRU, in inches. [snowpck]
hru_sublmton
Amount of sublimation loss from snowpack for HRU, in inches. [snowpck]
hru_evapinter
Amount of intercepted water evaporated from the canopy, in inches. [intrcp]
hru_irrigation
Amount of irrigation water applied to a HRU, in inches. [intrcp]
chgsmrobsn
Basin change in saturated soil moisture due to observed discharge, in inches. [runtru]
surplus
Basin amount of excess not drained by observed discharge, in inches. [runtru]
deficit
Basin amount observed discharge not supplied by free water, in inches. [runtru]
The module first declares the three variables for the daily, monthly, annual water balances for the modeled area. These variables are: qbaldy, qbalmo, and qbalyr, respectively. The initialization part of the module initializes the above variables to zero and gets the variable wght, which weights the water-budget components for each HRU based on area.
The run part of the module accumulates for each day the HRU values for the external variables listed above. If the parameter dsum is less than 1, then the daily water balance (qbaldy) is not calculated. The daily water balance for all HRUs can be a large file and thus, should only be used in selected situations. Last, if there is observed runoff, then the three external variables chgsmrobsn, surplus, and deficit are obtained from the module runtru_dpm.f. These three variables account for basin changes in soil moisture and surpluses/deficits due to accounting for observed runoff. These budget items are then accumulated in the budget terms. This calculation is completed at this time because runtru_dpm.f is invoked after the process loop.
Bauer, H.H., and Vaccaro, J.J., 1987, Documentation of a deep percolation model for estimating ground-water recharge: U. S. Geological Survey Open-File Report 86-536, 180 p.
Henry H. Bauer and John J. Vaccaro
U.S. Geological Survey
Washington Water Science Center
934 Broadway, Suite 300
Tacoma, WA 98402
Modified by:
John J. Vaccaro
U.S. Geological Survey
Washington Water Science Center
934 Broadway, Suite 300
Tacoma, WA 98402
Telephone: 253-552-1620
Fax: 253-552-1581
Email: jvaccaro@usgs.gov
U.S.
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