SlideServe
Télécharger Obtenir Pro
Menu
Accueil Pro
Préférences
ApparenceLight Aide et commentaires
© SlideServe · v2026

Utilizing LTHIA for Effective Nonpoint Source Water Pollution Reduction Training

elga avatar
elga
34 diapositives · 485 Views · Oct 05, 2014

This hands-on training session focuses on utilizing Long Term Hydrologic Impact Assessment (LTHIA) to mitigate nonpoint source water pollution through improved land use planning. Participants will learn how to calculate runoff water chemistry and volume based on land use and soil types, utilizing data such as 30-year average rainfall and soil characteristics. The session will include practical applications using Web-GIS tools for watershed delineation and evaluating land use changes. Attendees will gain insights into hydrologic modeling and scenario analysis for better environmental management.

#utilizing lthia for effective nonpoint source water pollution reduction training #utilizing lthia for effective nonpoint source water pollution reduction training ppt #powerpoint #presentation
Utilizing LTHIA for Effective Nonpoint Source Water Pollution Reduction Training - slide 1
01 / 34Utilizing LTHIA for Effective Nonpoint Source Water Pollution Reduction Training
1 / 17

Télécharger la présentation

Utilizing LTHIA for Effective Nonpoint Source Water Pollution Reduction Training
Une image / un lien ci-dessous est fourni (tel quel) pour télécharger la présentation

Politique de téléchargement : le contenu du site vous est fourni TEL QUEL pour votre information et votre usage personnel ; il ne peut être vendu, concédé sous licence ni partagé sur d’autres sites sans l’accord de son auteur.Le contenu vous est fourni TEL QUEL, pour votre information et votre usage personnel uniquement. Téléchargez la présentation en cliquant sur ce lien. Lors du téléchargement, si vous ne parvenez pas à télécharger une présentation, l’éditeur a peut-être supprimé le fichier de son serveur.Pendant le téléchargement, si vous ne parvenez pas à obtenir une présentation, le fichier a peut-être été supprimé par l’éditeur.

F I N

Plus de contenu associé

Transcription de la présentation

  1. Use of LTHIA to Reduce Nonpoint Source Water PollutionHands-on Training Bernard A. Engel Tong Zhai Larry Theller Agricultural and Biological Department Purdue University In conjunction with POLIS Center, IUPUI and Indiana Dept. Environmental Management

  2. Long Term Hydrologic Impact Assessment (LTHIA) • Calculates the chemistry and volume of runoff water, based only on landuse and soil type. • Changing the landuse in an area will change the typical runoff chemistry. • This uses assumption called “curve-number.” • LTHIA in use for 5 years.

  3. https://engineering.purdue.edu/~lthia Processes for Hydrologic Impact Analysis Using Web-GIS Tools Outlet Point Selection Using Aerials, roads, or streams Run Watershed Delineation To get contributing area Watershed Delineation Result Examine maps Reflect Land Use Change Using Online Digitizing Run L-THIA Runoff and NPS Output/Impact Evaluation

  4. Landuse 1 Landuse 3 Landuse 3 Soil A Soil B We break soils into 4 hydrologic conditions, which are used to estimate runoff volume. We break landuse into 8 basic types, which are used to estimate chemistry.

  5. Curve Number Basics: rainfall to runoff ratio for different surfaces Direct Runoff Rainfall http://www.ecn.purdue.edu/runoff/documentation/scs.htm

  6. Averaged mass of NPS contaminant from each landuse

  7. LTHIA isolates the flowshed to estimate the runoff, so it calculates runoff for the -shed.

  8. Data Issues: Working with 10 meter DEMS means we can not use watersheds larger than 10 digit. So, if the user clicks on the mouth of the Wabash or the Tippecanoe River, they get the first upstream 10 Digit watershed. All contiguous 10 Digit watersheds are supported.

  9. Take-Home points DEM is only used to calculate flowshed DEM is not used for not erosion - runoff Runoff is based on surface type – not slope won’t account for frozen ground 30 year average rainfall Chemistry is based on landuse averages

  10. Databases provide input • Weather data (30 years of real rainfall) • Soil data (STATSGO or SSURGO ) • Elevation data (for contributing area)

  11. Long Term Hydrologic Impact Assessment (LTHIA) • 2007 we added connection to the Indiana Water Quality Atlas • 2007 we added new data: • Landuse based on parcels, • better DEM, • better stream layer

  12. https://engineering.purdue.edu/~lthia Processes for Hydrologic Impact Analysis Using Web-GIS Tools Outlet Point Selection Using Aerials, roads, or streams Run Watershed Delineation To get contributing area Watershed Delineation Result Examine maps Reflect Land Use Change Using Online Digitizing Run L-THIA Runoff and NPS Output/Impact Evaluation

  13. LTHIA Web site

  14. Watershed Delineation and Result Page

  15. Watershed Delineation and Result Page

  16. Results Display

  17. Change Land Use in the Watershed Using Online Digitizing Tool For Example,Add Low Density Residential, Commercial, and High Density Residential Areas

  18. L-THIA Input Page After Changing Land Use Multiple scenarios – offer multiple development options. User constructs scenario by online digitizing.

  19. Scenario Results Page Present Land Use Data After Change Land Use Data Application Buttons forHydrological Model Operation

  20. L-THIA Result Runoff Tables Can display pre-and post calibration and also land-use change scenarios.

  21. Comparison Chart for Runoff and Land Use to Evaluate the Land Use Change Impact on Hydrology

  22. NPS Pollutant Loading Chart

  23. Print and Download Page

  24. IWQA GIS Interactive Button to Delineate Watershed Select Outlet Point Coordinate is passed to LTHIA

  25. Near Future:L-THIA Input Data PreparationCalibration module in development: • Next 12 months • 15 counties Landuse from parcels • Calibration with IWQA data • Hands-on Training

  26. Calibration Display Available IWQA Calibration data points in the regional watershed. User may OK using curve numbers calibrated for watershed.

  27. User will be able to identify (query) the IWQA data locations used for calibration.

  28. L-THIA Input Data PreparationCalibration module in development: Calibration data will be used behind the scenes to construct modified curve numbers. These modified curves will more closely match the observed results from the IWQA than the published curve numbers.

  29. The End Thank You https://engineering.purdue.edu/~lthia