GIS Applications in Hydrology Baxter E. Vieux, Ph.D., P.E. School of Civil Engineering and Environmental Science University of Oklahoma 202 West Boyd Street, Room CEC334 Norman, OK

Web Pages Faculty profile Environmental Modeling and GIS Laboratory Under construction, but… Independent Study Course in Hydrology On campus course in Hydrology

Geographic Information Systems Geographic information systems (GIS) are a useful tool for analysis of spatially distributed features on and under the earth surface. Considering the inherently spatial character of components of the hydrologic cycle, GIS is increasingly used by hydrologists to analyze, simulate, and understand hydrologic processes. Representation of the essential physical characteristics of a hydrologic process in terms of parameter maps raises issues not generally considered by hydrologists before the advent of the technology and spatial data. Spatial resolution, scale, attribute uncertainty, surface interpolation, error propagation, and aspects related to the linkage or integration of spatially distributed data within a GIS and a hydrologic model. Web links:

GIS Data Characteristics of GIS Data— Map scale, spatial detail, and extent Coordinate systems Datums Map projections Points, contours, rasters, TINs

Data types Watershed boundaries delineation Soil and landuse/cover classification Digital elevation data Meteorological parameters Radar Satellite

Digital Elevation Model We are here I was there

Projections Georeferenced coordinate systems Review of geographic coordinates Ellipsoidal versus spherical

Stereographic Projection Parameters— Spheroid=sphere Central Meridian=105W Reference Latitude=60N

HRAP Projection Meridians of longitude 0 Greenwich England Western Parallels of latitude 0 equator +90 North pole

GIS Application to Flood Prediction Mapping rainfall into a basin Rainfall intensities in space and time Rainfall extent versus basin size Case study: Tulsa, May 5-6, 2000

Basin Hydrology Using GIS Objective— 1. Use a GIS to estimate rainfall accumulations over a small watershed 2. Become familiar with GIS concepts involved with Watershed delineation Rainfall maps Fast response basin hydrology

Tulsa, Oklahoma May 5-6, 2000

Storm Total Tulsa, Oklahoma May 5-6, 2000

Exercise Items you will need-- 1. Laboratory handout— tulsa_ex.doc TulsaWorld.htm 2. Exercise data— tulsa_ex.apr Open the Arcview Project Follow the exercise