Search Results - "Looms, Majken C."

Mapping spatiotemporal soil moisture in highly heterogeneous agricultural landscapes using mobile dual‐spectra cosmic‐ray neutron sensing by Andreasen, Mie, Kragh, Søren Julsgaard, Meyer, Rena, Jensen, Karsten Høgh, Looms, Majken C.

“…Accurate large‐scale soil moisture (SM) maps are crucial for catchment‐scale hydrological models used for water resource management and warning systems for…”
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Comparison of evapotranspiration estimates using the water balance and the eddy covariance methods by Denager, Tanja, Looms, Majken C., Sonnenborg, Torben O., Jensen, Karsten H.

“…The eddy covariance method estimates the energy flux of latent heat for evapotranspiration. However, imbalance between the land surface energy output and input…”
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High‐Resolution Geological Information from Crosshole Ground Penetrating Radar in Clayey Tills by Jensen, Bolette B., Rosenberg, Louise, Tsitonaki, Aikaterini, Tuxen, Nina, Bjerg, Poul L., Nielsen, Lars, Hansen, Thomas M., Looms, Majken C.

“…Heterogeneous glacial deposits dominate large parts of the Northern Hemisphere. In these landscapes, high‐resolution characterization of the geology is crucial…”
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Mapping Root-Zone Soil Moisture Using a Temperature–Vegetation Triangle Approach with an Unmanned Aerial System: Incorporating Surface Roughness from Structure from Motion by Wang, Sheng, Garcia, Monica, Ibrom, Andreas, Jakobsen, Jakob, Josef Köppl, Christian, Mallick, Kaniska, Looms, Majken, Bauer-Gottwein, Peter

“…High resolution root-zone soil moisture (SM) maps are important for understanding the spatial variability of water availability in agriculture, ecosystems…”
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Cosmic Ray Neutron Soil Moisture Estimation Using Physically Based Site‐Specific Conversion Functions by Andreasen, Mie, Jensen, Karsten H., Bogena, Heye, Desilets, Darin, Zreda, Marek, Looms, Majken C.

“…In order to advance the use of the cosmic ray neutrons (CRNs) to map soil moisture in heterogeneous landscapes, we need to develop a methodology that reliably…”
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Seasonal dynamics of canopy interception loss within a deciduous and a coniferous forest by Andreasen, Mie, Christiansen, Jesper R., Sonnenborg, Torben O., Stisen, Simon, Looms, Majken C.

“…Canopy interception loss is a key process in forest hydrology and the role of interception loss in relation to the forest water budgets and future impact of…”
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Practical data acquisition strategy for time-lapse experiments using crosshole GPR and full-waveform inversion by Keskinen, Johanna, Looms, Majken C., Klotzsche, Anja, Nielsen, Lars

“…Crosshole ground penetrating radar (GPR) methods are increasingly used in time-lapse studies of flow in the uppermost near subsurface with important…”
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Modeling cosmic ray neutron field measurements by Andreasen, Mie, Jensen, Karsten H., Zreda, Marek, Desilets, Darin, Bogena, Heye, Looms, Majken C.

“…The cosmic ray neutron method was developed for intermediate‐scale soil moisture detection, but may potentially be used for other hydrological applications…”
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Point-scale multi-objective calibration of the Community Land Model (version 5.0) using in situ observations of water and energy fluxes and variables by Denager, Tanja, Sonnenborg, Torben O, Looms, Majken C, Bogena, Heye, Jensen, Karsten H

“…This study evaluates water and energy fluxes and variables in combination with parameter optimization of version 5 of the state-of-the-art Community Land Model…”
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Monitoring CO2 migration in a shallow sand aquifer using 3D crosshole electrical resistivity tomography by Yang, Xianjin, Lassen, Rune N., Jensen, Karsten H., Looms, Majken C.

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Advancing measurements and representations of subsurface heterogeneity and dynamic processes: towards 4D hydrogeology by Hermans, Thomas, Goderniaux, Pascal, Jougnot, Damien, Fleckenstein, Jan H, Brunner, Philip, Nguyen, Frédéric, Linde, Niklas, Huisman, Johan Alexander, Bour, Olivier, Lopez Alvis, Jorge, Hoffmann, Richard, Palacios, Andrea, Cooke, Anne-Karin, Pardo-Álvarez, Álvaro, Blazevic, Lara, Pouladi, Behzad, Haruzi, Peleg, Fernandez Visentini, Alejandro, Nogueira, Guilherme E. H, Tirado-Conde, Joel, Looms, Majken C, Kenshilikova, Meruyert, Davy, Philippe, Le Borgne, Tanguy

“…Essentially all hydrogeological processes are strongly influenced by the subsurface spatial heterogeneity and the temporal variation of environmental…”
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Cosmic-ray neutron transport at a forest field site: the sensitivity to various environmental conditions with focus on biomass and canopy interception by Andreasen, Mie, Jensen, Karsten H, Desilets, Darin, Zreda, Marek, Bogena, Heye R, Looms, Majken C

“…Cosmic-ray neutron intensity is inversely correlated to all hydrogen present in the upper decimeters of the subsurface and the first few hectometers of the…”
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Exploring the combined use of SMAP and Sentinel-1 data for downscaling soil moisture beyond the 1 km scale by Meyer, Rena, Zhang, Wenmin, Kragh, Søren Julsgaard, Andreasen, Mie, Jensen, Karsten Høgh, Fensholt, Rasmus, Stisen, Simon, Looms, Majken C.

“…Soil moisture estimates at high spatial and temporal resolution are of great value for optimizing water and agricultural management. To fill the gap between…”
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Groundwater flow and mixing in a wetland–stream system: Field study and numerical modeling by Karan, Sachin, Engesgaard, Peter, Looms, Majken C., Laier, Troels, Kazmierczak, Jolanta

“…► We examine a wetland–stream system combining field studies and numerical modeling. ► CFCs and major-ions analyses of samples show distinct changes within the…”
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Advancing quantitative understanding of self-potential signatures in the critical zone through long-term monitoring by Hu, Kaiyan, Jougnot, Damien, Huang, Qinghua, Looms, Majken C., Linde, Niklas

“…•Multi-year self-potential monitoring at the HOBE hydrological observatory, Denmark.•Year-long instead of decade-long stability of Petiau electrodes in the…”
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Full-waveform inversion of Crosshole GPR data: Implications for porosity estimation in chalk by Keskinen, Johanna, Klotzsche, Anja, Looms, Majken C., Moreau, Julien, van der Kruk, Jan, Holliger, Klaus, Stemmerik, Lars, Nielsen, Lars

“…The Maastrichtian-Danian chalk is a widely distributed hydrocarbon and groundwater reservoir rock in north-western Europe. Knowledge of lateral and vertical…”
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Monitoring of saline tracer movement with vertically distributed self-potential measurements at the HOBE agricultural test site by Jougnot, Damien, Linde, Niklas, Haarder, Eline B., Looms, Majken C.

“…The self-potential (SP) method is sensitive to water fluxes in saturated and partially saturated porous media, such as those associated with rainwater…”
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Geophysical Inversion Using a Variational Autoencoder to Model an Assembled Spatial Prior Uncertainty by Lopez‐Alvis, J., Nguyen, F., Looms, M. C., Hermans, T.

“…Prior information regarding subsurface spatial patterns may be used in geophysical inversion to obtain realistic subsurface models. Field experiments require…”
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Accounting for Modeling Errors in Linear Inversion of Crosshole Ground‐Penetrating Radar Amplitude Data: Detecting Sand in Clayey Till by Jensen, B. B., Hansen, T. M., Nielsen, L., Cordua, K. S., Tuxen, N., Tsitonaki, A., Looms, M. C.

“…Mapping high permeability sand occurrences in clayey till is fundamental for protecting the underlying drinking water resources. Crosshole ground penetrating…”
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Quantifying the influence of static-like errors in least-squares-based inversion and sequential simulation of cross-borehole ground penetrating radar data by Cordua, Knud S., Nielsen, Lars, Looms, Majken C., Hansen, Thomas M., Binley, Andrew

“…Unknown borehole irregularities and small-scale velocity fluctuations near transmitter and receiver antennae positions may cause relatively strong travel time…”
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