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New Mexico State University (2020)

Risk Mapping of Groundwater Salinization Using the Drastic Method in the Rincon Valley

Cisneros, Joel

Titre : Risk Mapping of Groundwater Salinization Using the Drastic Method in the Rincon Valley

Auteur : Cisneros, Joel

Université de soutenance : New Mexico State University

Grade : Master of Applied Geography 2020

Farmers in the Rincon Valley are using saline groundwater to irrigate crops due to declining levels of surface water from the Elephant Butte Reservoir. Using saline water can affect crop yield. A lot of farmers in the Rincon Valley are transitioning traditional crops from the valley such as peppers, cotton, and wheat to pecan orchards. There are a lot of problems that should be evaluated when transitioning to pecan orchards. Pecan orchards are a costly investment and require a lot of water. The water that pecan orchards require is of high quality due to pecans being sensitive to saline water. One of the major problems that need to be evaluated is the inability for pecan orchards to be rotated. This causes salts to be left behind in the soil making the soil highly saline throughout the years. In this study, the groundwater vulnerability to pollution was evaluated for The Rincon Valley, Southern New Mexico using GIS DRASTIC model. The DRASTIC Method is a time and cost-effective approach in showing areas of greatest potential for ground water contamination based on hydrogeologic and anthropogenic factors. investment for many farmers and are especially sensitive to salinity in reduced yields and even tree mortality. Based upon available data, seven thematic maps were generated and combined using the Weighted Sum tool to create a DRASTIC Index map. All data were acquired from public sources. Most raw data were vector shapefiles, with three raster images which were collected for land cover, topography, and crop data for the study area. Most data that was then converted to raster shapefiles. The DRASTIC Index map showed most of the study area had a high risk of ground water contamination potential. This is due to the parameters with the highest weights had high ratings. Although the DRASTIC method usually gives satisfactory results in the evaluation of groundwater intrinsic vulnerability to contamination, it is important to add additional data to strengthen my results (Al-Rawabdeh et al., 2014) . In this research, Total Dissolved Solids (TDS) data and crop data were added. TDS data and Crop data were important to understand the spatial variability of salinization in the Rincon Valley.

Présentation (NMSU Library)

Aperçu document (ProQuest)

Page publiée le 12 octobre 2020