Integration of Experimental and Modeling Approaches (ModEX) to Analyze Spatio-Temporal Hydrogeochemical Processes and Land-Use Interactions in the River Corridor of the Cypress Creek Basin, Texas
Document Type
Thesis
Degree Name
Master of Science (MS)
Department
Biological and Environmental Sciences
Date of Award
Spring 5-1-2026
Abstract
This study investigates the spatio-temporal hydrogeochemical dynamics of the Cypress Creek Basin, Texas, using an integrated Model-Experiment (ModEX) framework. Water and soil samples were collected from 20 sites during two important seasonal periods to understand how land-use changes may be influencing ecological stability, especially in relation to the decline of the Kisatchie Painted Crayfish (Faxonius maletae). A range of water quality indicators was measured, including pH, dissolved oxygen (DO), electrical conductivity (EC), major ions, redox potential (ORP), and elemental composition (CHNS). These parameters were interpreted using the Water Quality Index (WQI), PHREEQC saturation modeling, Piper diagram, and Pearson correlation analysis. The pH values ranged from 6.13 to 7.88, reflecting slightly acidic to mildly alkaline conditions typical of natural surface waters. DO levels remained relatively high, between 8 and 11 mg/L, indicating that most sites were well oxygenated. In contrast, electrical conductivity varied widely, from 43.6 to 699 µS/cm, with the highest value recorded at Site S-2, suggesting localized increases in dissolved ions. Iron concentrations ranged from 0.067 to 2.524 mg/L, with Site S-20 showing the highest level. WQI results indicated clear spatial differences. Most sites fell within the “Excellent” (<50) and “Good” (50–100) categories, while Sites S-12 and S-14 exceeded 300, classifying them as “Unfit for Aquatic Fish.” Land-use analysis based on Landsat imagery (2005–2025) shows expanding agricultural and settlement areas. Overall, the integrated results suggest that localized land-use activities are influencing hydrogeochemical stability and potentially contributing to ecological stress within the basin.
Advisor
Bjorn Schmidt
Subject Categories
Biology | Life Sciences
Recommended Citation
Alam, Md Jahanggir, "Integration of Experimental and Modeling Approaches (ModEX) to Analyze Spatio-Temporal Hydrogeochemical Processes and Land-Use Interactions in the River Corridor of the Cypress Creek Basin, Texas" (2026). Electronic Theses & Dissertations. 1341.
https://lair.etamu.edu/etd/1341
