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Sediment Land Calibration: Status and Decision Rules

Sediment Land Calibration: Status and Decision Rules. Land-River Connection in HSPF. Edge of Field. BMP Factor. Edge of Stream. Land Acre Factor. Delivery Factor. Corresponding to model structure, calibration strategies break into…. Land calibration River Calibration. Detached Sediment.

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Sediment Land Calibration: Status and Decision Rules

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  1. Sediment Land Calibration: Status and Decision Rules Chesapeake Bay Program Modeling

  2. Land-River Connection in HSPF Edge of Field BMP Factor Edge of Stream Land Acre Factor Delivery Factor Chesapeake Bay Program Modeling

  3. Corresponding to model structure, calibration strategies break into… • Land calibration • River Calibration Chesapeake Bay Program Modeling

  4. Detached Sediment = NVSI lb/day = KSER * RO * (RO + Water Storage) J1 = AFFIX * (Detached sediment) Wash off Input Attachment Detachment J2 = (1-cover) * KRER* (Rain) Soil Matrix (unlimited) Land Sediment Simulation Chesapeake Bay Program Modeling

  5. Land Calibration • Calibrate Edge of Field to targets • Split into major land uses Chesapeake Bay Program Modeling

  6. Group 2 – Harvested Forest Natural grass Extractive Barren Pervious Urban Impervious Urban water Group 1 – Forest Pasture Hay High till with manure High till without manure Low till with manure 13 Land use categories for sediment: Chesapeake Bay Program Modeling

  7. EOF Targets • For each land use ingroup 1: EOF targets available at county level RUSLE supplied by NRI • For each land use ingroup 2: Single EOF target obtained from literature Chesapeake Bay Program Modeling

  8. Land EOF calibration • For each land use in group 1, reach EOF targets county by county Total = 6 land use X 308 counties = 1848 • For each land use in group 2, reach single target for the entire watershed Chesapeake Bay Program Modeling

  9. Iterative Calibration • Wrote computer programs to automatically calibrate EOF for all land use and all counties • Started with parameter set from manual calibration • Developed rules for adjusting parameter values based on model outputs Chesapeake Bay Program Modeling

  10. Attachment Decision Rules for Four Key land Parameters: • Rule1 – detached sed reach 90% of max sediment in 30 days AFFIX = 0.07673 Detached Sediment = AFFIX * (Detached sediment) Chesapeake Bay Program Modeling

  11. Input Detached Sediment • Rule2 – Vertical Input high enough for hysteresis NVSI (lb/acre/day)= a * target load (lb/acre/yr) a - changeable parameter Assumed a =0.5 for hvf grs pur … NVSI 0.93 9.32 4.11 3.01 … = NVSI lb/day Chesapeake Bay Program Modeling

  12. Rule 3 - Zero Detached Sed after Large Storms Adjust KRER and KSER to ensure - No build-up after most big storms - Reach to targets Ratio of KSER:KRER = b (changeable) Enforced minimum and maximum values Chesapeake Bay Program Modeling

  13. Decision Rules PARAMETERS for hvf grs pas hay hom hwm lwm pur ext bar AFFIX, 0.07673 NVSI, 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 KS-KR, 2 2 2 2 2 2 2 2 2 2 2 *** min and max allowed by user and by HSPF KRER, 0.01 50. 0.0 100. KSER, 0.01 100. 0.0 200. Chesapeake Bay Program Modeling

  14. Expected results: • Land segment A42033 Chesapeake Bay Program Modeling

  15. Eight Scenarios tested Scenarios a (NVSI/Target) KSER:KRER 1 0.5 2 2 0.6 2 3 0.7 2 4 0.8 2 5 0.5 2.5 6 0.5 3 7 0.6 2.5 8 0.6 3 Chesapeake Bay Program Modeling

  16. Scenarios with same KSER:KRER ratio Chesapeake Bay Program Modeling

  17. Scenarios with same NVSI/Target ratio Chesapeake Bay Program Modeling

  18. Status and expected steps • Computer programs ready • EOF calibration can be done in 2~3 days once final land use and hydrology parameters available Chesapeake Bay Program Modeling

  19. Land-River Connection Edge of Field BMP Factor Edge of Stream Land Acre Factor Delivery Factor Chesapeake Bay Program Modeling

  20. River Calibration… • Have started manual calibration • Calibrate to three sediment rating curves, statistics… • Hope to develop iterative calibration based on manual practice Chesapeake Bay Program Modeling

  21. Chesapeake Bay Program Modeling

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