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Investigating the causes of reduced dissolved oxygen concentrations in Kickapoo Creek, TX
Narayanan Kannan1, Kartik Venkataraman2, Jeff Stroebel3
1Pollinator Health in Southern Crop Ecosystems Research Unit-United States, Department of Agriculture-Agricultural Research Service, Stoneville, MS, 38776, USA. narayanan.kannan@usda.gov.
Environmental Monitoring and Assessment
|July 8, 2022
Summary
Excessive nutrients and organic matter lower dissolved oxygen (DO) in Kickapoo Creek. Rising temperatures and nutrient influx from upstream contribute to low DO, especially in summer, impacting stream health.
Area of Science:
- Environmental Science
- Water Quality Management
- Stream Ecology
Background:
- Streams can experience reduced dissolved oxygen (DO) due to excessive organic matter and nutrient loading.
- Kickapoo Creek in Texas is identified as an impaired water body with depressed DO levels and elevated Escherichia coli.
- Understanding the drivers of these water quality issues is crucial for effective remediation.
Purpose of the Study:
- To investigate the causes of depressed dissolved oxygen (DO) in Kickapoo Creek.
- To identify sources contributing to depressed DO and elevated Escherichia coli levels.
- To explore potential remedial measures for improving stream water quality.
Main Methods:
- Monthly water quality monitoring at nine stations within the watershed.
- 24-hour DO monitoring at three selected stations for comparison with established criteria.
- Correlational, graphical, spatial, and temporal analyses of DO concentrations against other water quality variables.
- Trend analysis of daily temperature data from 1981-2020 using Mann-Kendall and Pettitt tests.
Main Results:
- Weak to moderate correlations were found between DO and nutrient/oxygen-demanding substance concentrations.
- Spatial and temporal trends indicated nutrient influx from upstream contributing to downstream DO decline.
- Riparian vegetation and sediment influx visually supported observed spatial patterns in DO.
- Depressed DO levels were most prevalent during summer months when streamflow is minimal.
- Increasing daily temperatures during summer were identified as a contributing factor to depressed DO.
Conclusions:
- Nutrient influx and increasing temperatures are key drivers of depressed DO in Kickapoo Creek, particularly during summer low-flow conditions.
- Management strategies should address nutrient loading and consider the impact of rising temperatures on stream DO.
- Further investigation into the sources of Escherichia coli is recommended.
Keywords:
Aquatic life useChlorophyll-aContact recreationKickapoo CreekModified Mann–Kendall testStream characterizationWater temperatureMore Related Videos
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