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Hans Thodsen
Aarhus University
54Publications
14H-index
452Citations
Publications 54
Newest
#1Hans ThodsenH-Index: 14
#2Jes J. RasmussenH-Index: 18
Last.Søren E. LarsenH-Index: 28
view all 6 authors...
Purpose Suspended matter (SM) in streams is usually considered of minor importance in Danish environmental management. However, SM has some ecological effects as it may (1) clog fish spawning grounds and (2) act as an important agent for transport and exposure of biota to chemical substances, such as phosphorus and toxic inorganic (e.g. heavy metals) and organic (e.g. pesticides) substances.
#1Wei Liu (AU: Aarhus University)
#2Seonggyu Park (TU: Temple University)
Last.Dennis Trolle (AU: Aarhus University)H-Index: 21
view all 11 authors...
Abstract. Being able to account for temporal patterns of streamflow, the distribution of groundwater resources, as well as the interactions between surface water and groundwater is imperative for informed water resources management. We hypothesize that, when assessing the impacts of water abstractions on streamflow patterns, the benefits of applying a coupled catchment model relative to a lumped semi-distributed catchment model outweigh the costs of additional data requirement and computational ...
#1Soraia CruzH-Index: 2
#2C.M.d.S. CordovilH-Index: 7
Last.Linda MayH-Index: 23
view all 10 authors...
Agricultural activities are responsible for most of the nitrogen (N) inputs that degrade water quality. To elucidate the drivers leading to N pressures on water, we examined the resulting state of surface waters in terms of N concentrations, the impact of this on water quality status and policy responses to these constraints across different climatic and management conditions. Portugal and Denmark were chosen as contrasting case studies for the Driver-Pressure-State-Impact-Response (DPSIR) analy...
#1Eugenio Molina-Navarro (AU: Aarhus University)H-Index: 6
#2Ryan T. Bailey (CSU: Colorado State University)H-Index: 13
Last.Dennis Trolle (AU: Aarhus University)H-Index: 21
view all 9 authors...
ABSTRACTIn hydrological modelling of catchments, wherein streams are groundwater-fed, an accurate representation of groundwater processes and their interaction with surface water is crucial. With this purpose, a coupled model was recently developed linking SWAT (Soil and Water Assessment Tool) with the fully-distributed groundwater model MODFLOW (Modular Groundwater Flow). In this study, SWAT and SWAT-MODFLOW were applied to a Danish groundwater-dominant catchment, simulating groundwater abstrac...
#1Dennis Trolle (AU: Aarhus University)H-Index: 21
#2Anders Lade Nielsen (AU: Aarhus University)H-Index: 24
Last.Erik Jeppesen (AU: Aarhus University)H-Index: 85
view all 12 authors...
Abstract To analyse the potential future ecological state of estuaries located in the temperate climate (here exemplified with the Odense Fjord estuary, Denmark), we combined end-of-the-century climate change projections from four different climate models, four contrasting land use scenarios (“Agriculture for nature”, “Extensive agriculture”, “High-tech agriculture” and “Market driven agriculture”) and two different eco-hydrological models. By decomposing the variance of the model-simulated outp...
#1Naicheng Wu (AU: Aarhus University)H-Index: 11
#2Hans ThodsenH-Index: 14
Last.Tenna Riis (AU: Aarhus University)H-Index: 26
view all 6 authors...
Abstract Changes in land use, climate and flow diversion are key drivers of river flow regime change that may eventually affect freshwater biodiversity and ecosystem functions. However, our knowledge is limited, on how the functional features of stream organisms vary along the gradient of hydrological disturbance (i.e. flow regime changes) and how flow regimes mediate the functional features in lowland streams. We analyzed the functional traits of benthic diatoms (unicellular siliceous algae), t...
#1Fatemeh Hashemi (AU: Aarhus University)H-Index: 3
#2Jørgen E. Olesen (AU: Aarhus University)H-Index: 59
Last.Tommy Dalgaard (AU: Aarhus University)H-Index: 27
view all 6 authors...
Abstract To comply with the EU Water Framework Directive, Denmark must further reduce the nitrate (N)-load to marine ecosystems from agricultural areas. Under the anticipated future spatially targeted regulation, the required N-load reductions will differ between catchments, and these are expected to be mitigated by a combination of land and water management measures. Here, we explored how the expected N-load reduction target of 38% for a Danish catchment (River Odense) could be achieved through...
#1Eugenio Molina-Navarro (AU: Aarhus University)H-Index: 6
#2Hans Estrup Andersen (AU: Aarhus University)H-Index: 24
Last.Dennis Trolle (AU: Aarhus University)H-Index: 21
view all 5 authors...
Abstract Water pollution and water scarcity are among the main environmental challenges faced by the European Union, and multiple stressors compromise the integrity of water resources and ecosystems. Particularly in lowland areas of northern Europe, high population density, flood protection and, especially, intensive agriculture, are important drivers of water quality degradation. In addition, future climate and land use changes may interact, with uncertain consequences for water resources. Mode...
#1C.M.d.S. CordovilH-Index: 7
#2Soraia CruzH-Index: 2
Last.Brian KronvangH-Index: 41
view all 7 authors...
Interactions among nitrogen (N) management and water resources quality are complex and enhanced in transboundary river basins. This is the case of Tagus River, which is an important river flowing from Spain to Portugal in the Iberian Peninsula. The aim was to provide a N assessment review along the Tagus River Basin regarding mostly agriculture, livestock, and urban activities. To estimate reactive nitrogen (Nr) load into surface waters, emission factor approaches were applied. Nr pressures are ...
#1Eugenio Molina-Navarro (AU: Aarhus University)H-Index: 6
#2Hans Estrup Andersen (AU: Aarhus University)H-Index: 24
Last.Dennis Trolle (AU: Aarhus University)H-Index: 21
view all 5 authors...
Abstract Automatic calibration of complex hydro-ecological models is an increasingly important issue which involves making decisions. One of the most relevant is the choice of the objective function, but its effects have been scarcely studied in complex models. We have used the SWAT model to assess the impact of the objective function for a multi-site (4 stations) and multi-variable (OrgP, OrgN, NO 3 − , PO 4 3− ) calibration of the Odense catchment (Denmark). Six calibration schemes were tested...
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