1 / 42

Section 12 - Overview of HSPF Modules

Section 12 - Overview of HSPF Modules. Virginia Tech Biological Systems Engineering Department 2013 DEQ TMDL Workshop. Strengths and Limitations - Discuss the strengths and limitations of the HSPF model

gen
Download Presentation

Section 12 - Overview of HSPF Modules

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. Section 12 - Overview of HSPF Modules Virginia Tech Biological Systems Engineering Department 2013 DEQ TMDL Workshop

  2. Strengths and Limitations -Discuss the strengths and limitations of the HSPF model HSPF Modules - Define the application and utility modules used to simulate the hydrologic and water quality processes through watersheds UCI Files - Describe the User Control Input (UCI) file, which stores the basic information for the HSPF model Exercise: Examine a UCI file Overview/Objectives

  3. HSPF Overview Hydrologic Simulation Program–FORTRAN Developed by USGS and EPA Hydrology – Stanford Watershed Model - early 1960’s Water quality – added in late 1970’s Continuous simulation watershed model Fixed time steps Deterministic Lumped parameter Modular Accepted by EPA for TMDL development

  4. Strengths of HSPF • Strengths • Complete watershed model • Continuous • Supported by EPA • Very flexible/customizable • Platform independent (FORTRAN supported) • Modular structure • Fast

  5. Weaknesses of HSPF • Weaknesses • Spatially-lumped • Steep learning curve • Many empirical relationships • Requires calibration • Meteorological inputs • Over-parameterization

  6. Limitations of HSPF • Limitations • No backwater effects • Water quality processes stop under 2” • Flow alterations difficult to simulate • Assumes well-mixed reservoirs

  7. Appropriate Uses • Modeling gaged watersheds • Comparing daily/seasonal/annual predictions • Suspect Uses • Modeling ungaged watersheds • Comparing hourly predictions • Evaluating management changes in one simulation • Inappropriate Uses • Modeling for the express purpose of obtaining subsurface flows/loads Applying HSPF

  8. Limitations of Watershed Modeling • The Bottom Line: • Garbage in, gospel out! garbage out! • Even under the BEST circumstances, modeling results are estimates!

  9. Conceptual Representation 2 1 2 1 3 3 4 4 Flow

  10. Physical Characteristics

  11. Spatial Representation • Analyze Streams • Identify primary stream segment in each sub-watershed Flow

  12. Spatial Representation • What HSPF Sees • RCHRES • Length • Change in Elevation • Cross-section information HSPF Flow

  13. Spatial Representation • Analyze Land Use • Identify land segments to be represented in HSPF

  14. Spatial Representation • What HSPF Sees: • PERLND • Parameters to describe pervious land segments • IMPLND • Parameters to describe impervious land segment Cropland Forest Residential Pasture

  15. Land Areas X = RCHRES Spatial Representation • What HSPF Sees: • SCHEMATIC Cropland Forest Residential Pasture PERLND & IMPLND

  16. Spatial Representation GIS HSPF

  17. Meteorological Inputs

  18. PERLND PREC PETINP LZS UZS SURS DEEPFR

  19. PERLND

  20. IMPLND PREC PETINP SURS

  21. IMPLND

  22. RCHRES

  23. HSPF: UCI File User's Control Input (UCI) The main control used in HSPF simulations ASCII flat-file (80 characters wide) Can be edited/saved using any suitable text editor Graphical user interfaces (GUI), like WinHSPF

  24. HSPF: UCI • Look at a UCI file • Open DEQ_Wshop_Example.uci

  25. UCI File Structure

  26. How to Interpret a UCI file • The HSPF User’s Manual contains formats for all UCI entries • Quick FORTRAN format explanation: • A = Character, String • F = Fixed Point Number • I = Integer • X = Space A6, I4, 18X, F10.2, 5X,A6, I4, 2X, I5 PERLND_101_____________________8231.4______RCHRES__01______2 2X I5 A6 I4 18X 5X I4 F10.2 A6

  27. Indicates Opening of Block Run Title Ending Date and Time English Units Ignore This Used by Spec Actions Should the Model Run? Run Interpreter Output Level Indicates Closing of Block Starting Date and Time How to Interpret a UCI file • General Example: GLOBAL GLOBAL: GLOBAL UCI for Dirty River Bacteria TMDL Allocation START 2003/01/01 00:00 END 2010/12/31 24:00 RUN INTERP OUTPT LEVELS 1 0 RESUME 0 RUN 1 UNITS 1 END GLOBAL

  28. FTABLE • Hydraulic F(unction)TABLE • Represents the geometric and hydraulic properties of stream reaches and reservoirs • Specifies the depth-volume-discharge relationship in each reach (RCHRES)

  29. 1 2 3 4 FTABLE Example

  30. FTABLE Development • Field-Based • Cross-sectional profile surveys • Digital-Based • Digital Elevation Models (DEMs) • NRCS Regional Hydraulic Geometry Curves Source: Development and Analysis of Regional Curves for Streams in the Non-Urban Valley and Ridge Physiographic Province, Maryland, Virginia, and West Virginia, USGS – SIR 2005-5076

  31. Comment Lines Beginning and Ending of this FTABLE FTABLE Representation in a UCI file FTABLE: FTABLE 11 rows cols *** 9 4 depth area volume outflow1 *** 0. 1.37 0. 0. 0.01 1.38 0.02 0.03 0.14 1.42 0.2 2.02 0.4 1.51 0.58 11.36 1.5 1.9 2.46 103.24 1.68 2.49 6.33 106.55 7. 19.82 167.33 16904.31 20. 136.39 1306.97 226237.18 END FTABLE 11

  32. SCHEMATIC • SCHEMATIC • Defines the land area for each PERLND and IMPLND segment • Defines the network that connects PERLNDs, IMPLNDs, and RCHRESs.

  33. External File Transfers *Watershed Data Management Files

  34. WDM • Watershed Data Management (WDM) format • Stores and manages time-series data: • hydrologic, • hydraulic, • meteorological, • water quality, and • physiographic

  35. WDM Use WDM Station 1 Station 2 …Station N Watershed Sub A Sub B …

  36. MUTSIN vs WDM • MUTSIN is created for each pollutant in setup • Can result in many files • Flexible (Missing data) • WDM • Only one file is opened • Easier to document (Comments in WDM and UCI files) • Time-step of data must match simulation time-step

  37. Utility Blocks

  38. HSPF Exercise • Open file HSPF_Exercise.uci 1. Using the GLOBAL block, identify the modeling period 2. Using the GEN-INFO block, identify the land uses in the watershed 3. Using the FTABLE block, identify the maximum depth in Reach 3 4. Using the SCHEMATIC block, describe the spatial representation of the watershed

  39. HSPF Exercise 4 • Using the SCHEMATIC block, describe the spatial representation of the watershed

  40. HSPF Exercises ANSWERS • Open file HSPF_Exercise.uci 1. Using the GLOBAL block, identify the modeling period September 1, 1989 to August 30, 2005 2. Using the GEN-INFO block, identify the land uses in the watershed Crop, Forest, Pasture, LDR 3. Using the FTABLE block, identify the maximum depth in Reach 3 60 feet 4.Using the SCHEMATIC block, describe the spatial representation of the watershed

  41. HSPF Exercise 4ANSWER • Using the SCHEMATIC block, describe the spatial representation of the watershed 6 7 4 5 3 2 1

  42. Questions/Comments

More Related