Sustainability | Free Full-Text | Improved Representation of Flow and Water Quality in a North-Eastern German Lowland Catchment by Combining Low-Frequency Monitored Data with Hydrological Modelling

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Achievements of fine chemical and ecological standing of groundwater (GW) and floor water (SW) our bodies are at present challenged primarily as a result of poor identification and quantification of air pollution sources. A excessive spatio-temporal hydrological and water high quality monitoring of SW and GW our bodies is the idea for a dependable evaluation of water high quality in a catchment. Nevertheless, excessive spatio-temporal hydrological and water high quality monitoring is dear, laborious, and exhausting to perform. This examine makes use of spatio-temporally low resolved monitored water high quality and river discharge knowledge together with built-in hydrological modelling to estimate the governing air pollution pathways and determine potential transformation processes. A key job on the regarded lowland river Augraben is (i) to know the SW and GW interactions by estimating consultant GW zones (GWZ) primarily based on simulated GW stream instructions and GW high quality monitoring stations, (ii) to quantify GW flows to the Augraben River and its tributaries, and (iii) to simulate SW discharges at ungauged places. Based mostly on simulated GW flows and SW discharges, NO3-N, NO2-N, NH4-N, and P hundreds are calculated from every outlined SW tributary outlet (SWTO) and respective GWZ by utilizing low-frequency monitored SW and GW high quality knowledge. The magnitudes of NO3-N transformations and plant uptake charges are accessed by estimating a NO3-N steadiness on the catchment outlet. Based mostly on sensitivity evaluation outcomes, Manning’s roughness, saturated hydraulic conductivity, and boundary situations are primarily used for calibration. The water steadiness outcomes present that 60–65% of complete precipitation is misplaced through evapotranspiration (ET). A complete of 85–95% of SW discharge in Augraben River and its tributaries is fed by GW through base stream. SW NO3-N hundreds are primarily depending on GW flows and GW high quality. Estimated SW NO3-N hundreds at SWTO_Ivenack and SWTO_Lindenberg present that these tributaries are closely polluted and contribute primarily to the whole SW NO3-N hundreds at Augraben River catchment outlet (SWO_Gehmkow). SWTO_Hasseldorf contributes least to the whole SW NO3-N hundreds. SW high quality of Augraben River catchment lies, on common, within the class of closely polluted river with a most NO3-N load of 650 kg/d in 2017. Estimated GW hundreds in GWZ_Ivenack have contributed roughly 96% of the whole GW hundreds and require most water high quality enchancment efforts to scale back excessive NO3-N ranges. By specializing in the impacts of NO3-N discount measures and greatest agricultural practices, additional research can improve the higher agricultural and water high quality administration within the examine space.
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