Hans Thodsen
Aarhus University
AgricultureDrainage basinHydrologySTREAMSEnvironmental engineering
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Publications 59
Abstract This paper studies the relative importance of societal drivers and changing climate on anthropogenic nutrient inputs of the Baltic Sea. Shared Socioeconomic Pathways and Representative Concentration Pathways are extended at temporal and spatial scales relevant for the most contributing sectors. Extended socioeconomic and climate scenarios are then used as inputs for spatially and temporally detailed models for population and land use change, and their subsequent impact on nutrient loadi...
#1Wei Liu (AU: Aarhus University)
#2Ryan T. Bailey (CSU: Colorado State University)H-Index: 13
Last. Dennis Trolle (AU: Aarhus University)H-Index: 21
view all 9 authors...
Abstract Assessing the impacts of groundwater abstractions on stream ecosystems is crucial for developing water planning and regulations in lowland areas that are highly dependent on groundwater, such as Denmark. To assess the effects of groundwater abstractions on flow regime and stream biota in a lowland groundwater-dominant catchment, we combined the SWAT-MODFLOW model with flow-biota empirical models including indices for three key biological taxonomic identities (fish, macroinvertebrates, a...
1 CitationsSource
#1Mikolaj CzajkowskiH-Index: 22
Last. Erik SmedbergH-Index: 12
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In this paper, we investigate the potential gains in cost-effectiveness from changing the spatial scale at which nutrient reduction targets are set for the Baltic Sea, focusing on nutrient loadings associated with agriculture. Costs of achieving loadings reductions are compared across five levels of spatial scale, namely the entire Baltic Sea; the marine basin level; the country level; the watershed level; and the grid square level. A novel highly disaggregated model, which represents decreases ...
#1Wei Liu (AU: Aarhus University)
#2Seonggyu Park (TU: Temple University)H-Index: 1
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 ...
4 CitationsSource
#1Soraia CruzH-Index: 2
Last. Linda MayH-Index: 25
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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...
1 CitationsSource
#1Hans Thodsen (AU: Aarhus University)H-Index: 14
#2Jes J. Rasmussen (AU: Aarhus University)H-Index: 19
Last. Søren E. Larsen (AU: Aarhus University)H-Index: 34
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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.
1 CitationsSource
#1Dennis Trolle (AU: Aarhus University)H-Index: 21
#2Anders Lade Nielsen (AU: Aarhus University)H-Index: 27
Last. Erik Jeppesen (AU: Aarhus University)H-Index: 87
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...
4 CitationsSource
#1Eugenio Molina-Navarro (AU: Aarhus University)H-Index: 8
#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 t...
1 CitationsSource
#1Naicheng Wu (AU: Aarhus University)H-Index: 12
#2Hans ThodsenH-Index: 14
Last. Tenna Riis (AU: Aarhus University)H-Index: 27
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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...
2 CitationsSource
#1Fatemeh Hashemi (AU: Aarhus University)H-Index: 4
#2Jørgen E. Olesen (AU: Aarhus University)H-Index: 60
Last. Tommy Dalgaard (AU: Aarhus University)H-Index: 29
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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...
9 CitationsSource