A5062036533- Hydrology and Watershed Management Studies
- Soil and Water Nutrient Dynamics
- Groundwater flow and contamination studies
- Water-Energy-Food Nexus Studies
- Water resources management and optimization
- Fish Ecology and Management Studies
- Groundwater and Isotope Geochemistry
- Hydrology and Sediment Transport Processes
- Wastewater Treatment and Nitrogen Removal
- Hydrology and Drought Analysis
- Integrated Energy Systems Optimization
- Electric Power System Optimization
- Hydrological Forecasting Using AI
- Atmospheric and Environmental Gas Dynamics
- Advanced Data Storage Technologies
- Urban Stormwater Management Solutions
- Smart Materials for Construction
- Geophysical Methods and Applications
- Soil erosion and sediment transport
- Pharmaceutical and Antibiotic Environmental Impacts
- Peatlands and Wetlands Ecology
- Marine and coastal ecosystems
- Water Treatment and Disinfection
- Fire effects on ecosystems
- Cavitation Phenomena in Pumps
KTH Royal Institute of Technology
2015-2024
Environmental Institute
2023
Royal Ottawa Mental Health Centre
2023
Swedish Meteorological and Hydrological Institute
2010-2015
Abstract Quantifying short-term changes in river flow is important understanding the environmental impacts of hydropower generation. Energy markets can change rapidly and energy demand fluctuates at sub-daily scales, which may cause corresponding regulated (hydropeaking). Due to increasing use renewable energy, future will play a greater role as load balancing power source. This increase current hydropeaking levels Nordic systems, creating challenges maintaining healthy ecological status....
Rivers are important ecosystems under continuous anthropogenic stresses. The hyporheic zone is a ubiquitous, reactive interface between the main channel and its surrounding sediments along river network. We elaborate on physical, biological, biogeochemical drivers processes within that have been studied by multiple scientific disciplines for almost half century. These previous efforts shown modulator most metabolic stream serves as refuge habitat diverse range of aquatic organisms. It also...
Abstract Weather climate fluctuations cause large variations in renewable electricity production, which requires substantial amounts of energy storage to overcome drought periods. Based on daily hydroclimatic data and information about power systems covering Europe, here we quantify the complementarity solar-wind-hydro components continental system. We show that spatiotemporal management production over Europe can induce a virtual gain is several times larger than available capacity...
Abstract Although hyporheic exchange has been shown to be of great importance for the overall water quality streams, it is rarely considered quantitatively in stream remediation projects. A main driver hydraulic head fluctuation along streambed, which can enhanced by modifications streambed topography. Here we present an analytical 2‐D spectral subsurface flow model estimate associated with topographies over a wide range spatial scales; that was validated using tracer‐test‐results and...
Advancing our predictive capabilities of heat fluxes in streams and rivers is important because the effects on ecology general use as analogues for solute transport. Along these lines, we derived a closed‐form solution that relates in‐stream temperature spectra to responding at various depths sediment through physical scaling factor including effective thermal diffusivity Darcy flow velocity. This analysis considers range frequencies fluctuations occur due diurnal meteorological variation...
This paper analyzes the effects of different hydrological mechanisms on solute response in watershed stream networks. Important processes are due to hydraulic and chemical retention reactive solutes transient storage zones cumulative consequences these from a single transport pathway as well network pathways. Temporal moments derived for distributed compartment‐in‐series model. The temporal evaluated utilized derive formal expressions translating parameters into compartmental model...
Abstract Fourier and wavelet analyses were used to reveal the dominant trends coherence of a more than one‐century‐long time series precipitation discharge in several watersheds Sweden, two which subjected hydropower intensive agriculture. During 20th century, there was gradual, significant drift periodicity agricultural watersheds. This study shows that steepness spectrum runoff from May October period each year increased gradually during suggests predictable intra‐annual pattern (more...
Abstract By use of numerical modeling and field observations, this work quantified the effects catchment‐scale upwelling groundwater on hyporheic (below stream) fluxes over a wide range spatial scales. A flow model was developed that specifically accounted for hydrostatic dynamic head fluctuations induced by streambed topography. Although magnitudes relative importance these streambed‐induced were found to be highly sensitive site‐specific hydromorphological properties, we showed topographic...
The viability of a renewable electricity system depends on relatively small share hydropower storage resources to regulate climate variations and the spatially uneven distribution energy. By spatio-temporal coordination production over larger regions, energy demand will be reduced contribute "virtual" gain that in Europe was found almost twice actual capacity reservoirs. In an attempt quantify this gain, availability simulated for most parts European continent 35-year period based historical...
Abstract New tools are needed to evaluate the impacts of short‐term hydropower regulation practices on downstream river systems and progress towards sustainable river‐flow management. As is increasingly being used balance energy load deficit caused by other less flexible sources, sub‐daily flow conditions across many regulated (RR) changing. To address this, we wavelet analyses quantify discharge variability in RRs categorized level based natural free‐flowing rivers. The presented framework...
Abstract The rapid development of novel technologies to obtain high‐frequency observations has provided new possibilities observe and understand carbon cycling in inland waters. This study investigates dioxide (CO 2 ) dynamics along a boreal soil‐stream transect using state‐of‐the‐art data set combination with spectral methodology identify controls on stream CO . decomposition hourly revealed intermediate (multiday) long‐term (monthly) patterns across the upslope‐riparian‐stream continuum,...
Abstract Interaction between surface water and groundwater plays a fundamental role in influencing aquatic chemistry, where hyporheic exchange processes, distribution of flow paths residence times within the zone will influence transport mass energy surface-water/groundwater system. Geomorphological conditions greatly exchange, heterogeneities such as rocks clay lenses be key factor for delineating zone. Electrical resistivity tomography (ERT) ground-penetrating radar (GPR) were used to...
Abstract Information about the effect of different dispersion mechanisms on solute response in watersheds is crucial for understanding temporal dynamics many water quality problems. However, to quantify these processes from stream time series may be difficult because governing responsible concentration fluctuations span a wide range and spatial scales. In an attempt address quantification problem, we propose novel methodology that includes spectral decomposition watershed using distributed...
Hydropower is the largest source of renewable energy in world and currently dominates flexible electricity production capacity. However, climate variations remain major challenges for efficient planning, especially annual forecasting periodically variable inflows their effects on generation. This study presents a model that assesses impact forecast quality efficiency hydropower operations. The uses ensemble stepwise linear optimisation combined with receding horizon control to simulate...
Abstract Excess CO 2 accumulated in soils is typically transported to the atmosphere through molecular diffusion along a concentration gradient. Because of slow and constant nature this process, steady state between peat production emissions often established. However, peatland ecosystems, high porosity could foster additional non-diffusive transport processes, whose dynamics may become important storage, emission. Based on continuous record situ pore within unsaturated zone raised bog...
Significant attention has been given to hyporheic water fluxes induced by hydromorphologic processes in streambeds and the effects they have on stream ecology. However, impact of regional groundwater flow discharge zones as well interaction these flows are much less investigated. The groundwater-hyporheic interactive not only governs solute mass heat transport streams but also controls retention contamination following deep groundwater, such naturally occurring solutes leakage from...
Abstract Artificial tracers are often used for quantitative estimates of solute transport properties in rivers. However, single‐injection tracer tests give insights characteristics limited to the ecohydrological conditions at testing time. Series time‐consuming and laborious would be required properly capture seasonal changes. The present study uses intrinsic diurnal fluctuations electrical conductivity (EC) caused by discharge treated wastewater as a evaluate processes along 4.7‐km reach...
Abstract A Fourier spectral analysis of daily discharge time series over the last century in 79 unregulated catchments Sweden reveals a significant gradual steepening power spectrum slope time. Where historical meteorological observations are available (the 41 southernmost catchments), results our analyses indicate that local land use changes within have affected spectra to greater extent than precipitation patterns. 1‐D distributed routing based on current and maps scenario modeling...
Abstract Climate‐driven fluctuations in the runoff and potential energy of surface water are generally large comparison to capacity hydropower regulation, particularly when is used balance electricity production from covarying renewable sources such as wind power. To define bounds reservoir storage capacity, we introduce a dedicated volume that aggregates several reservoirs handle specific watersheds. We show how can be related spectrum climate‐driven modes variability availability...
Abstract Hyporheic exchange flow (HEF) can generally be quantified through two different approaches. The first approach, which is deductive, entails physically based models, supported with relevant observations. second approach includes inductive assessments of stream tracer tests using solute transport provide a useful mathematical framework that allows for upscaling results, but included parameters often have vague physical base, limits the possibilities generalizing results independent...
As a part of the overall safety assessment for geological disposal radioactive waste, models different ecosystems are used to evaluate doses humans and biota from possible radionuclide discharges biosphere. In previous assessments, transport modelling radionuclides in running waters such as streams has been much simplified extent that only dilution inflow considered with no regard any other interactions. Hyporheic exchange flow (HEF) is surface water enters subsurface zone and, after some...