L ong t erm h ydrologic i mpact a ssessment l thia model
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L ong- T erm H ydrologic I mpact A ssessment ( L-THIA ) Model PowerPoint PPT Presentation


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L ong- T erm H ydrologic I mpact A ssessment ( L-THIA ) Model. An overview / screening model User friendly tool Does not require detailed data input Identifies need for more detailed modeling Provides "What-If" alternatives evaluation scenarios. L-THIA Model concepts. charge.

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L ong- T erm H ydrologic I mpact A ssessment ( L-THIA ) Model

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L ong t erm h ydrologic i mpact a ssessment l thia model

Long-Term Hydrologic Impact Assessment (L-THIA) Model

  • An overview / screening model

  • User friendly tool

  • Does not require detailed data input

  • Identifies need for more detailed modeling

  • Provides "What-If" alternatives evaluation scenarios


Charge

L-THIA Model concepts

charge

  • Curve Number (CN) based approach

  • Uses 30 years of precipitation data to predict yearly runoff

  • Precipitation data is used to estimate the Antecedent Moisture

  • Content (AMC) in the soil, the CN is adjusted accordingly

  • Event Mean Concentration (EMC) is used to estimate Non

  • Point Source (NPS) pollution


L ong t erm h ydrologic i mpact a ssessment l thia model

Data requirements and components for analysis in L-THIA

Land use

Curve Number values

Soils

Runoff depths

Location

Daily precipitation

NPS pollutants map

Runoff volumes map

User supplied information

Performed by L-THIA


Charge1

Availability at present…

charge

  • L-THIA WWW in a spreadsheet version that models

  • runoff and nps pollution changes

  • L-THIA GIS - set of Avenue scripts that automate the

  • process of runoff impact modeling within ArcView

  • L-THIA GIS WWW allows interactive mapping of the

  • area of interest with a custom java interface within

  • a web browser


Charge2

charge

online spreadsheet version

online GIS version

Availability of L-THIA

(http://www.ecn.purdue.edu/runoff)

Downloadable Avenue codes

executable within ArcView


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Development of the L-THIA WWW System

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Land use and hydrologic soil group provided by user and long term daily precipitation data queried from ORACLE database.

LTHIA/NPS generates runoff and NPS pollution output in tabular and graphical representations - bar and pie chart form


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Development of the L-THIA GIS WWW System

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Java, JavaScript, ArcView Internet Map Server (IMS), Netscape Server and Avenue Scripts in ArcView are used.

URL Request by Java Applet  Netscape Server  URL parse by ArcView IMS  Execute ArcView Avenue Scripts in LTHIA/NPS GIS


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