1 / 24

Sediment Land Calibration and Delivery Factor Calculation

Sediment Land Calibration and Delivery Factor Calculation. Land-River Connection. Edge of Field. BMP factor. Edge of Stream. Land Acre Factor. Delivery Factor. Content. Edge of Field (EOF) calibration Delivery Factor Calculation . = KSER * RO * (RO + Water Storage). J1. Wash off.

cher
Download Presentation

Sediment Land Calibration and Delivery Factor Calculation

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Sediment Land Calibration and Delivery Factor Calculation Chesapeake Bay Program Modeling

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

  3. Content • Edge of Field (EOF) calibration • Delivery Factor Calculation Chesapeake Bay Program Modeling

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

  5. Land Calibration • Calibrate Edge of Field to RUSLE supplied by NRI • Split into major land uses Chesapeake Bay Program Modeling

  6. Group 1 - Forest Harvested Forest Natural grass Extractive Barren Pervious Urban Impervious Urban water Group 2 - 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. For Each Land Use in group 1: • Mean EOF for entire watershed reach to target - Keep land parameters same everywhere - Use different energy in hydrological processes to drive the difference • Reasons: - Only ONE EOF value available - Avoid over-parameterization Chesapeake Bay Program Modeling

  8. For Each Land Use in group 2: • EOF targets available at county level • Reach EOF county by county • Different land parameters Chesapeake Bay Program Modeling

  9. Attachment Decision Rules for Four Key land Parameters: • Rule1 – 90% detached sed re-attached to soil matrix in 30 days AFFIX = 0.7673 Detached Sediment = AFFIX * (Detached sediment) Chesapeake Bay Program Modeling

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

  11. Rule 3 - Zero Detached Sed after Large Storms Adjust KRER and KSER -No build-up after most big storms - Reach to NRI targets Chesapeake Bay Program Modeling

  12. Forest – 0.34 tons/acre/year Mean = 0.339 Chesapeake Bay Program Modeling

  13. Harvested Forest – 3.4 tons/acre/year Mean = 3.39 Chesapeake Bay Program Modeling

  14. Natural Grass – 1.5 tons/acre/year Mean = 1.498 Chesapeake Bay Program Modeling

  15. Pervious Urban –1.1 tons/acre/year Mean = 1.105 Chesapeake Bay Program Modeling

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

  17. Ideal delivery factor • Vary by segment • Vary by land use type • Vary by flow condition • Last two are like a finer segmentation scheme Chesapeake Bay Program Modeling

  18. Delivery factor methodsEPA region 4 sediment tool • DF = (1 - 0.97 * L / C) ( sun and Mcnulty 1998) • DF = exp(-0.4233*L*exp (-16.1* (Y/L + 0.057)) - 0.6) (Yagow 1988) • DF = 0.417762 * A -0.134958 - 0.127097 (SCS 1983) • DF = .9004 - .1341 (lnL) - .0465 (lnL)2 +.00749 (lnL)3 - .0399 (lnY) +.0144 (lnY)2 +.00308(lnY)3 (Swift 2000) Chesapeake Bay Program Modeling

  19. Chesapeake Bay Program Modeling

  20. SCS method Adopted • Similar to successful phase 4 method • Less data intensive and more stable that other methods • Not particular to a land use type • DF = 0.417762 * A -0.134958 - 0.127097 Chesapeake Bay Program Modeling

  21. Proposed method: Relate delivery to average distance from land to river by segment Chesapeake Bay Program Modeling

  22. Single factor for each land use in each segment • Related to watershed size • Unique for each Land use • Assume mean distance is the radius of a circle A = π*(mean distance)^2 Chesapeake Bay Program Modeling

  23. Some Preliminary Results - Chesapeake Bay Program Modeling

  24. Next Step… • Finish EOF calibration • Get ready for river calibration Chesapeake Bay Program Modeling

More Related