1 / 17

Flooding in Flathead County and Kalispell, MT

Flooding in Flathead County and Kalispell, MT. Initiation to Geo-HMS and HEC-HMS. Remi Candaele Hydrology - CE394K. Outline. Context & Flood Events Characteristics ArcGIS Process Geo-HMS Process HMS Model Future Work. Evergreen – Kalispell Suburb - 1995. Context.

kiele
Télécharger la présentation

Flooding in Flathead County and Kalispell, MT

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Flooding in Flathead County and Kalispell, MT Initiation to Geo-HMS and HEC-HMS Remi Candaele Hydrology - CE394K

  2. Outline • Context & Flood Events Characteristics • ArcGIS Process • Geo-HMS Process • HMS Model • Future Work Evergreen – Kalispell Suburb - 1995

  3. Context • Flathead county subject to flooding • Located in northwest corner of Montana State. • Total area of 13,614 km² (5,256 mi²), • 410 km² (158 mi²) of it (3.01%) is water. • As of 2000, the population was 74,471.

  4. Motivations • Being familiar with a Hydraulic Model !!!

  5. Flood Events Characteristics Peak Flow : 2 events at 35m3/s Peak Flow : 2 events > 100m3/s

  6. Flood Events Characteristics Flathead Valley • Occurring mostly during spring time, • Focus on 2 major events : • 04/13/1996 • 04/20/1997 • Low Rainfall intensity : computation over a long period, • Difficulty : 1 meteorological station and 2 gauge stations. Time Series

  7. Catchments & Streams Delineation • Projected Coordinate System : NAD1983_StatePlane_Montana • 7 Subwatersheds selected SubWatershed Characteristics

  8. Reclassification of Land Cover • Data downloaded from NLCD • Reclassification in 4 main categories thanks to Dr Venkatesh Merwade Land Use Grid Obtained

  9. Soil Data – Characterization of the Soil Type • SSURGO (scale 1:24,000) dataset doesn’t cover the entire watershed: use of the Statsgo dataset (1:250000). • 4 types of soil: A/B/C/D. Soil B assigned to the unknown soils

  10. Curve Number & Grid • CN obtained from SCS TR55 (1986) • Generation of a CN Grid • Statistics • Mean : 66.26 • Std Deviation : 11.06

  11. Geo-HMS ArcGIS Interface to create input files to HMS • Processes • River Length • River Slope • Basin Slope • FlowPaths, • Basin Centroids • HMS Inputs/Parameters • Loss, Transform methods by SCS, • Route method by Muskingum • Time Lag • Basin Curve Numbers Selection of the contributing catchments - GeoHMS Interface

  12. Geo-HMS ArcGIS Interface to create input files to HMS Basin Lag in Hours Basin Curve Numbers

  13. Geo-HMS ArcGIS Interface to create input files to HMS Schematic Export to HMS

  14. Running the model under HMS • Meteorologic model : • Weight gages, • Muskingum routing, • Time Lag, • Time Series.

  15. Results – Calibrating the model • Computations for exercising. • Next steps : • Find accurate numbers for Muskingum routing, • Calibration factor : Streamflow = Model

  16. Acknowledgments • Venkatesh Merwade – Purdue U. • Christine Dartiguenave – ESRI • Ron Schlagenhaufer – Flathead County • Folks : Eusebio, Tyler, Brian & others

  17. Questions ????

More Related