San Juan Basin. San Juan-Pagosa Springs(PSPC2) Upper (11000-12644) Middle (8500-11000) Lower (7198-8500) San Juan-Pagosa Springs(PSPC2)

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Presentation transcript:

San Juan Basin

San Juan-Pagosa Springs(PSPC2)

Upper ( ) Middle ( ) Lower ( ) San Juan-Pagosa Springs(PSPC2)

In reality the 3 areas (upper, middle and lower) are represented (simulated) by only 3 points The inputs our model needs for calibrations and operations (at these 3 points) are: precipitation temperature freezing level Calibrations/Simulations - inputs

PSPC2 upper area Elevation = Area=60nm PSPC2 middle area Elevation = 9774 Area=152nm PSPC2 lower area Elevation = 7844 Area=88nm For San Juan River at Pagosa Springs (PSPC2)

Each area (upper, middle and lower) MAP is built using precipitation stations that (hopefully) have similar characteristics to that area For the PSPC2 Upper area – Upper San Juan.4, Lily Pond.35, Middle Creek.36 Middle area - Upper San Juan.31, Lily Pond.31, Middle Creek.32 Lower area - Pagosa Springs 1.06 These weights were chosen to guarantee water balance in each area. The water balance in each area was calculated using the PRISM sets Calibrations/Simulations - Precipitation

San Juan-Pagosa Springs(PSPC2) mdlc2 usjc2 lpdc2 pagc2

Nearby stations (whose climatology is known) area used to calculate the temperature at the mid-point elevation of the area (whose climatologies are calculated using the climatology of the nearby stations) Temperature is calculated by using the difference in station and area climatology Calibrations/Simulations - Temperature

Precipitation and temperature are calculated every six hours at each area within the basin 30 years Used to calibrate hydrologic models Operationally done in a similar way Ensures our forecasts will have similar quality/characteristics to 30 years of calibration For the San Juan at Pagosa Springs this is done for the upper, middle and lower areas Calibrations/Simulations - Inputs

A snow model (accumulates/ablates snow) is run for each area in the basin A soil moisture model (controls amount of water from the snow model which is retained in the soil/evaporates or ends up in the stream) is run for each area Evaporation is a calibrated amount : E=P-Q Calibrations/Simulations - Models

Precipitation and Air Temperature Rain or Snow Energy Exchange at Snow-Air Interface Snow Cover Heat Deficit Ground Melt Snow Cover Outflow Rain plus Melt Areal Extent of the Snow Cover Liquid Water Storage Transmission of Excess Water Accumulated Snow Cover SNOW ACCUMULATION AND ABLATION MODEL (SNOW-17) Rain on Bare Ground Deficit = 0 Bare ground or snow cover

12

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