1 / 13

Flow Anisotropy in the Red River Alluvial Aquifer Caddo Parish, Louisiana

Flow Anisotropy in the Red River Alluvial Aquifer Caddo Parish, Louisiana. By: John Hubbard CE 394K. Problem. Can ArcView be used effectively to map the potentiometric surface in an anisotropic aquifer? Can flow direction be determined using spatial analyst?. Study Area.

liam
Télécharger la présentation

Flow Anisotropy in the Red River Alluvial Aquifer Caddo Parish, Louisiana

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. Flow Anisotropy inthe Red River Alluvial Aquifer Caddo Parish, Louisiana By: John Hubbard CE 394K

  2. Problem • Can ArcView be used effectively to map the potentiometric surface in an anisotropic aquifer? • Can flow direction be determined using spatial analyst?

  3. Study Area

  4. Aquifers of Louisiana

  5. Red River Alluvium • Covers 2,120 sq. Miles of Louisiana • Composed of medium to fine-grained sand and silt. • Silt acts as retarding units with-in the alluvium

  6. Wells • Data from 69 USGS observation wells were obtained • Dates after 1990 were thrown out due to the construction of lock-and-dam. • 1980 was selected as an average year with the most data available leaving 38 wells to be mapped

  7. Well Data • The high, low elevations of the head in each well were sorted • The mean annual head elevation was calculated

  8. Longitude and Latitude • Data about each well was obtained from the Louisiana Department of Transportation and Development • Longitude and Latitude were sorted in Excel and converted to decimal degrees

  9. Plotting Well Data • The Elevation Table and Long/Lat Table were added to ArcView and joined by well number • The newly joined elevation table mapped using “Add Event Theme” • A decrease in head elevation can be seen from north to south

  10. Spatial Analyst • The spatial analyst extension was then loaded and the “surface/interpolate grid” function was used • This produces a potentiometric map • However, this map shows no reference to the river or the edge of the alluvium

  11. Spatial Analyst 2 • The spatial Analyst was run again, however, this time the NHD file 11140202.shp, was placed as a barrier • Again, this produces another potentiometric map

  12. More Spatial Analyst • The Spatial Analyst was then used to calculate the the aspect of the potentiometric surface to approximate flow direction

  13. Issues and Problems • Lack of data • No western border • River stage was not included • Aspect does not account for anisotropy

More Related