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  • Directory of Open Access Journals (DOAJ)  (47)
Type of Medium
Language
Year
  • 1
    Language: English
    In: Remote Sensing, 01 October 2018, Vol.10(10), p.1637
    Description: L-band radiometer measurements were performed at the Selhausen remote sensing field laboratory (Germany) over the entire growing season of a winter wheat stand. L-band microwave observations were collected over two different footprints within a homogenous winter wheat stand in order to disentangle...
    Keywords: Microwave Remote Sensing ; Vegetation Optical Depth ; Soil Moisture ; Winter Wheat ; Smos ; Smap ; Tower-Based Experiment ; Inverse Modeling ; Geography
    E-ISSN: 2072-4292
    Source: Directory of Open Access Journals (DOAJ)
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  • 2
    Language: English
    In: Water, 01 September 2018, Vol.10(10), p.1290
    Description: Bedrock topography is known to affect subsurface water flow and thus the spatial distribution of pore water pressure, which is a key factor for determining slope stability. Therefore, the aim of this study is to investigate the effect of bedrock topography on the timing and location of landslide...
    Keywords: Slope Stability ; Local Factor of Safety ; Bedrock Topography ; Soil Depth ; Soil Layering ; Rainfall Induced Landslide ; 2d and 3d Simulation ; Landslide Initiation ; Subsurface Flow ; Rainfall Intensity ; Engineering
    E-ISSN: 2073-4441
    Source: Directory of Open Access Journals (DOAJ)
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  • 3
    Language: English
    In: Remote Sensing, 01 September 2015, Vol.7(9), pp.12041-12056
    Description: We tested an off-ground ground-penetrating radar (GPR) system at a fixed location over a bare agricultural field to monitor the soil freeze-thaw cycles over a snow-covered surface. The GPR system consisted of a monostatic horn antenna combined with a vector network analyzer, providing an ultra-wideband...
    Keywords: Ground-Penetrating Radar ; Freeze-Thaw Cycles ; Seasonal Snow Cover ; Inversion ; Geography
    E-ISSN: 2072-4292
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  • 4
    Language: English
    In: Remote Sensing, 01 March 2015, Vol.7(3), pp.2808-2831
    Description: Leaf Area Index (LAI) is an important variable for numerous processes in various disciplines of bio- and geosciences. In situ measurements are the most accurate source of LAI among the LAI measuring methods, but the in situ measurements have the limitation of being labor intensive and site...
    Keywords: Leaf Area Index ; Red-Edge Band ; Rapideye ; Atmospheric Correction ; Validation ; Time-Series ; Geography
    E-ISSN: 2072-4292
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  • 5
    Language: English
    In: Earth System Science Data, 2017, Vol.9(2), pp.529-543
    Description: Agroecosystem models, regional and global climate models, and numerical weather prediction models require adequate parameterization of soil hydraulic properties. These properties are fundamental for describing and predicting water and energy exchange processes at the transition zone between solid earth and atmosphere, and regulate evapotranspiration, infiltration and runoff generation. Hydraulic parameters describing the soil water retention (WRC) and hydraulic conductivity (HCC) curves are typically derived from soil texture via pedotransfer functions (PTFs). Resampling of those parameters for specific model grids is typically performed by different aggregation approaches such a spatial averaging and the use of dominant textural properties or soil classes. These aggregation approaches introduce uncertainty, bias and parameter inconsistencies throughout spatial scales due to nonlinear relationships between hydraulic parameters and soil texture. Therefore, we present a method to scale hydraulic parameters to individual model grids and provide a global data set that overcomes the mentioned problems. The approach is based on Miller–Miller scaling in the relaxed form by Warrick, that fits the parameters of the WRC through all sub-grid WRCs to provide an effective parameterization for the grid cell at model resolution; at the same time it preserves the information of sub-grid variability of the water retention curve by deriving local scaling parameters. Based on the Mualem–van Genuchten approach we also derive the unsaturated hydraulic conductivity from the water retention functions, thereby assuming that the local parameters are also valid for this function. In addition, via the Warrick scaling parameter 〈i〉λ〈/i〉, information on global sub-grid scaling variance is given that enables modellers to improve dynamical downscaling of (regional) climate models or to perturb hydraulic parameters for model ensemble output generation. The present analysis is based on the ROSETTA PTF of Schaap et al.(2001) applied to the SoilGrids1km data set of Hengl et al.(2014). The example data set is provided at a global resolution of 0.25° at 〈a href="https://doi.org/10.1594/PANGAEA.870605" target="_blank"〉https://doi.org/10.1594/PANGAEA.870605〈/a〉.
    Keywords: Geology;
    ISSN: Earth System Science Data
    ISSN: 18663508
    E-ISSN: 1866-3516
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  • 6
    Language: English
    In: Vadose Zone Journal, 01 February 2018, Vol.17(1)
    Description: The spatiotemporal distribution of root water uptake (RWU) depends on the dynamics of the root distribution and compensatory uptake from wetter regions in the root zone. This work aimed to parameterize three RWU models with different representations of compensation: the Feddes–Jarvis model...
    Keywords: Agriculture
    ISSN: 1539-1663
    E-ISSN: 1539-1663
    Source: Directory of Open Access Journals (DOAJ)
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  • 7
    Language: English
    In: Vadose Zone Journal, 01 March 2018, Vol.17(1)
    Description: Soil greenhouse gas (GHG) emissions contribute to global warming. To support mitigation measures against global warming, it is important to understand the controlling processes of GHG emissions. Previous studies focusing mainly on paddy rice fields or wetlands showed a strong relationship between...
    Keywords: Agriculture
    ISSN: 1539-1663
    E-ISSN: 1539-1663
    Source: Directory of Open Access Journals (DOAJ)
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  • 8
    Language: English
    In: Journal of Hydrology: Regional Studies, September 2015, Vol.4, pp.294-312
    Description: The Federal State of North Rhine-Westphalia (NRW), Germany. On behalf of the Federal State Agency for Nature, Environment and Consumer Protection of North Rhine-Westphalia, Germany (LANUV) the mGROWA model is applied, in order to simulate the water balance components actual evapotranspiration, total runoff, direct runoff and groundwater recharge at Federal State level. mGROWA-simulations were performed in daily time steps for the hydrological reference period 1971–2000 and in a spatial resolution of 100 by 100 m. mGROWA results for groundwater recharge and State-wide recorded groundwater withdrawal rates have been used to assess the extent of groundwater exploitation in NRW. Simulated groundwater recharge levels are presented as long-term annual averages and as long-term monthly values in order to indicate the seasonal fluctuation of groundwater recharge rates. Quantitative statistics indicate that mGROWA enables the simulation of total runoff and groundwater recharge without significant tendency of over- or underestimation. Against this background mGROWA simulation results are used by LANUV to support regional water resources management, e.g. for determining the status of groundwater exploitation in NRW. The majority of groundwater bodies in NRW are at present not at risk of unsustainable groundwater usage. A small number of groundwater bodies along the river Rhine, however, have been assessed as being close to unsustainable groundwater exploitation.
    Keywords: Water Balance Components ; Soil Water Balance ; Runoff ; Runoff Components ; Groundwater Recharge ; Groundwater Management ; Geography
    ISSN: 2214-5818
    E-ISSN: 2214-5818
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  • 9
    Language: English
    In: Remote Sensing, 01 March 2018, Vol.10(3), p.427
    Description: Several studies currently strive to improve the spatial resolution of coarse scale high temporal resolution global soil moisture products of SMOS, SMAP, and ASCAT. Soil texture heterogeneity is known to be one of the main sources of soil moisture...
    Keywords: Smos ; Smap ; Ascat ; Soilgrids ; Soil Moisture Variability ; Scaling ; Soil Texture ; Geography
    E-ISSN: 2072-4292
    Source: Directory of Open Access Journals (DOAJ)
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  • 10
    Language: English
    In: Sensors, 01 January 2017, Vol.17(1), p.208
    Description: Soil water content is a key variable for understanding and modelling ecohydrological processes. Low-cost electromagnetic sensors are increasingly being used to characterize the spatio-temporal dynamics of soil water content, despite the reduced...
    Keywords: Soil Water Content ; Permittivity ; Calibration ; Sensor-to-Sensor Variability ; Smt100 Sensor ; Engineering
    E-ISSN: 1424-8220
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