Research Opportunities in GIS in Water Resources, 2002-2003

1. Research Opportunities in GIS in Water Resources, 2002-2003 David R. Maidment Dept of Civil Engineering University of Texas at Austin ECJ 8.612, 471-4620 CRWR, 471-0065 Maidment@mail.utexas.edu

2. Current Projects • I have 10 students currently working on projects sponsored by NSF, EPA, Corps of Engineers, USGS, Texas Water Development Board, Texas Natural Resources Conservation Commission, Texas General Land Office, …. • Projects deal with Geographic Information Systems applied to flooding, water quality and water resource issues.

3. Hydrologic Information System Analysis, Modeling, Decision Making Arc Hydro Geodatabase

4. Drainage System Hydro Network Flow Time Time Series Hydrography Channel System Arc Hydro Components

5. Arc Hydro Data Model Hydrology Hydrography

6. Data Model Based on Inventory Streams Drainage Areas Hydrography Channels Terrain Surfaces Rainfall Response Digital Orthophotos

7. Data Model Based on Behavior Follow a drop of water from where it falls on the land, to the stream, and all the way to the ocean.

8. Integrating Data Inventory using a Behavioral Model Relationships between objects linked by tracing path of water movement

9. New Projects • Arc Hydro for the Llano River watershed (to be supported by the Lower Colorado River Authority) • Use of LIDAR in Floodplain Mapping (to be supported by the UT Center for Space Research, NASA and FEMA) These are both 1 year projects but I expect that funding on these or similar efforts will continue at the end of that year

10. Arc Hydro for the Llano River • Develop an Arc Hydro framework dataset for the Llano River watershed • Incorporate time series data from the LCRA Hydromet system (precip and streamflow) • Develop Dynamic Data Exchange between Space/Time series data and LCRA’s HMS model for flood forecasting on the Llano River

11. Arc Hydro Framework Input Data Watersheds Waterbody Streams Monitoring Points

12. Arc Hydro Framework

13. Arc Hydro Framework Dataset for the Guadalupe Basin

14. Use of LIDAR for Floodplain Mapping • Study area is in Brownsville/Matamoros • UT Bureau of Economic Geology will fly LIDAR data acquisition there in Oct/Nov • Goal is to understand how various LIDAR data collection strategies affect the accuracy of flood plain mapping • Involves hydrologic modeling with HEC-HMS and HEC-RAS for study area using LIDAR data as input

15. Light Detection and Ranging (LIDAR) • Mirror sweeps laser beam across the ground. It “paints” the ground with light pulses at 1-5m intervals on the ground • Range to target is determined by measuring time interval between transmission and return of reflected laser pulse. • Aircraft position is determined using Global Positioning Systems • Data streams recorded and synchronized for post processing to give a terrain surface map

16. Light Detection and Ranging (LIDAR) • Mirror sweeps laser beam across the ground. • Range to target is determined by measuring time interval between transmission and return of reflected laser pulse. • Aircraft position is determined using GPS phase differencing techniques. • Pointing direction of laser determined with Inertial Measuring Unit (IMU) and recording of mirror position. • Data streams recorded and synchronized for post processing.

19. Contact Me • I’d be pleased to chat with you. I am teaching my GIS in Water Resources course Tues –Thurs 12:30-2PM and plan to have office hours following that class in ECJ 8.612. You’ll have to take this course if you plan to work with me. • I work at Center for Research in Water Resources at the Pickle Research Campus on Mon-Weds-Fri. • Send me an email at maidment@mail.utexas.edu to schedule an appointment.