Spatial Patterns ofEscherichia coliConcentrations in Sediment before and after High‐Flow Events in a First‐Order Creek
| Autor: | Matthew D. Stocker, Yakov Pachepsky, Michael Penrose |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Hydrology
chemistry.chemical_classification Environmental Engineering 0208 environmental biotechnology Sediment Sampling (statistics) Particle (ecology) 02 engineering and technology 010501 environmental sciences Management Monitoring Policy and Law 01 natural sciences Pollution 020801 environmental engineering chemistry Spatial ecology Environmental science Spatial variability Organic matter Water quality Precipitation Waste Management and Disposal 0105 earth and related environmental sciences Water Science and Technology |
| Zdroj: | Journal of Environmental Quality. 47:958-966 |
| ISSN: | 1537-2537 0047-2425 |
| DOI: | 10.2134/jeq2017.11.0451 |
| Popis: | Understanding spatial patterns of in freshwater sediments is necessary to characterize sediments as microbial reservoirs and to evaluate the impact of sediment resuspension on microbial water quality in watersheds. Sediment particle size distributions and streambed concentrations were measured along a 500-m-long reach of a first-order creek 1 d before and on Days 1, 3, 6, and 10 after each of two artificial high-flow events, with natural high-flow events also occurring within the sampling periods. Spatial variability of was greater in sediments than in water within any given sampling; however, variation between sampling days was greater for water than for sediment. The mean relative difference analysis revealed temporally stable patterns of concentrations in sediments. rich locations along the reach corresponded to areas with higher organic matter and fine particle contents. Although low ( < 0.5 d) or negative survival rates were observed at most locations along the reach during times where no precipitation was recorded, a small number of locations showed such large concentration increase that on average the survival rate remained positive at the reach scale. The studied creek appears to have hot spots of concentration increase, where conditions for populations to increase are much more favorable than in most other locations across the reach. The effect of this increase can be seen at the reach scale but is difficult to discern without individual sampling that is dense in space and time. |
| Databáze: | OpenAIRE |
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