linkage of the archydro data model with swat - texas a&m
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Linkage of the ArcHydroData Model with SWAT
Francisco Olivera, Ph.D., P.E.Milver Valenzuela
Texas A&M University - Department of Civil Engineering
Raghavan Srinivasan, Ph.D.Texas A&M University – Department of Forest Sciences
SWAT2003Bari, Italy
July 4, 2003
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Model Integration
Sharing of information between models is necessary to capture the complexity of natural hydrologic processes.
This sharing of information between models in a systematic fashion is called here model integration.
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Model Integration
Connection on a two-model basis.Depends on the already connected
models.
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Model Integration
Connection on a hub basis.Independent of the already
connected models
HUB
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Arc Hydro
Arc Hydro can be used as the hub for connecting hydrologic models.
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Arc Hydro
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What it is and what it is not …
Arc Hydro is a geodatabase, that is, a relational database that contains geographic information.
Arc Hydro is a standard data model for spatial and temporal hydrologic data.
A data model is a template for organizing data, so that it can be found and retrieved easily.
Entertainment center
River network
Watersheds Waterbodies
Points
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ArcGIS-SWAT
ArcGIS-SWAT is an ArcView 8.x preprocessor for the Soil Water Assessment Tool (SWAT) compatible with the Arc Hydro data model developed by Texas A&M University – Civil Engineering and Forest Sciences with support of the U.S. Army Corps of Engineers.
Improvement with respect to AVSWAT developed by Di Luzio et al.
SWAT
Arc Hydro
HUB
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SWAT/GIS Interfaces
Srinivasan and Arnold (1994): SWAT 1990 / GRASS – C programming language.
Bian et al. (1998): SWAT 1990 / ArcInfo – Arc Macro Language (AML)
Di Luzio et al. (1998): SWAT 1996 / ArcView – Avenue programming language.
Di Luzio et al. (2002): Improved 1998 interface and was incorporated in BASINS.
Olivera et al. (2003): Improved 2002 interface for ArcView 8.x – Visual Basic
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What's new?
Compatible with the latest ESRI GIS software package ArcView 8.x and programming standards.
Uses a geodatabase data structure to store (and relate) spatial features, parameter tables and time series tables.
Stores the location of the hydrologic response units (HRU).
Includes a Monte Carlo parameter simulation utility.
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ArcGIS-SWAT Toolbar
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Watershed Delineator
Delineates streams and watersheds using the 8-direction pour point algorithm.
Input: DEM, mask, threshold value, vector stream network, outlets.
Output: Watershed, Reach, Outlet, MonitoringPoint, Basin, and LongestPath.
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Watershed Delineator
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Watershed Delineator
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Features Classes
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Relationship Classes
Watershed – Outlet: One-to-one relationship class.
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Relationship Classes
Reach – Outlet: One-to-one relationship class.
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Soils
STATSGO soils data.
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Land use / land cover
National Land Cover Dataset (NLCD)
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Soils and Land Use Data
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Hydrologic Response Units
HRU are generated by intersecting watershed, soil and land-use polygons.
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Hydrologic Response Units
HRU are generated by intersecting watershed, soil and land-use polygons.
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Features Classes
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Relationship Classes
HRU – Watershed: Many-to-one relationship class.
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Weather
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Weather
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Editing Input Data
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Editing Static Geodatabase
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Monte Carlo Simulator
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Conclusions
A new SWAT interface for ArcView 8.x has been developed.
Development of an ArcView 8.x interface for SWAT requires to develop an application-specific geodatabase not to build geometric networks or create/edit relationship classes.
The hub for data-sharing should be time series at points and not the entire spatial representation of the hydrologic features.
XML applicability to read geodatabases and write XML files will be studied.