High resolution sensors reveal the impact of wetlands on water quality regimes in a drought-sensitive intermittent stream
| Autor: | Wang, F., Tetzlaff, D., Freymueller, J., Soulsby, C. |
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| Rok vydání: | 2023 |
| Zdroj: | XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) |
| DOI: | 10.57757/iugg23-0255 |
| Popis: | Increasing drought frequency and severity from climate change are causing stream flow to become increasingly intermittent in many areas. This has implications for the spatio-temporal characteristics of water quality regimes which need to be understood in terms of risks to provision of clean water for public supplies and instream habitats. Recent advances in sensor technology allow reliable and accurate high-resolution monitoring of a growing number of water quality parameters. Here, we monitored a suite of water quality parameters at high resolution over four years in an intermittent stream network in the eutrophic, lowland Demnitz Mill Creek catchment, Germany. We focused on the impacts of a wetland system impacted by Beaver dams on diurnal, seasonal and inter-annual water quality dynamics and used data to model stream metabolism. Dissolved oxygen, pH, NO3 and phosphorus concentrations were higher upstream of the wetland, while conductivity, turbidity and chlorophyll were higher downstream. We found clear diurnal cycling of dissolved oxygen and pH. These dynamics were correlated with temperatures and stream metabolism and became increasingly pronounced as flows decreased in spring and summer. Upstream of the wetland this corresponded to the stream becoming increasingly heterotrophic. Downstream, the stream was always heterotrophic and prone to increasingly anoxic conditions before stream flow ceased. Intra and Inter-annual variations in water quality were found to correlate with both hydrological and hydroclimatic factors, particularly temperature. These insights contribute to an evidence base for understanding how climate change will affect the quantity and quality of rural water resources and guide management responses. The 28th IUGG General Assembly (IUGG2023) (Berlin 2023) |
| Databáze: | OpenAIRE |
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