14 results for "Per Moldrup"
Showing 1–14 · 0.54 seconds · RSS
-
Journal Article
Rapid and Fully Automated Measurement of Water Vapor Sorption Isotherms: New Opportunities for Vadose Zone Research
Eminent environmental challenges such as remediation of contaminated sites, the establishment and maintenance of nuclear waste repositories, or the design of surface landfill covers all require accurate quantification of the soil water characteristic (SWC) at low water contents. Furthermore…
-
Journal Article
Gas transport parameters of differently compacted granulated bentonite mixtures (GBMs) under air-dried conditions
Granulated bentonite mixtures (GBMs) have been regarded as effective buffer materials in the deep geological disposal of radioactive waste due to their operational advantages, such as ease of transportation and in-situ placement/backfilling. Many studies have been done to characterize the hydraulic…
-
Journal Article
Water‐ and air‐filled pore networks and transport parameters under drying and wetting processes
Abstract The connectivity and tortuosity of fluid‐filled pore networks in the water and air phases strongly influence the mass transport in porous media. Moisture conditions (water content and distribution) alter water‐ or air‐filled pore networks. In this study, using a sand column with variable…
-
Journal Article
Transport and Deposition of Variably Charged Soil Colloids in Saturated Porous Media
A series of column experiments was conducted to investigate the transport and deposition of variably charged colloids in saturated porous media. Soil colloids with diameters
-
Journal Article
Specific surface area of soils with different clay mineralogy can be estimated from a single hygroscopic water content
The soil specific surface area (SSA) is an important variable for soil science and geoenvironmental engineering applications, but traditional measurement methods are difficult and time-consuming. Regression models or pedotransfer functions are often used to estimate SSA from other soil properties…
-
Journal Article
Combining Visible−Near-Infrared and Pedotransfer Functions for Parameterization of Tile Drain Flow Simulations
Estimation of soil hydraulic parameters is essential when generating a hydrogeological model for simulating water flow dynamics in an agricultural field. However, estimation of the input parameters through direct measurements is time consuming and costly, and the spatial variability presents an…
-
Journal Article
Combining X-ray Computed Tomography and Visible Near-Infrared Spectroscopy for Prediction of Soil Structural Properties
Soil structure is a key soil property affecting a soil’s flow and transport behavior. X-ray computed tomography (CT) is increasingly used to quantify soil structure. However, the availability, cost, time, and skills required for processing are still limiting the number of soils studied. Visible…
-
Journal Article
High-resolution monitoring and modeling of subsurface CO2 dynamics in soybean field
Soil CO2 dynamics play a crucial role in the global carbon cycle, particularly in agricultural soils where management practices influence CO2 dynamics. This study quantified soil CO2 concentrations and fluxes under different fertilization treatments (chemical vs. organic) in a soybean field and…
-
Journal Article
Comparison of Cation Exchange Capacity Estimated from Vis–NIR Spectral Reflectance Data and a Pedotransfer Function
Knowledge of the cation exchange capacity (CEC) for soils or other porous media is very important for civil engineering and agricultural applications. However, the standard laboratory methods to measure CEC are costly and laborious. The aim of this research was to develop a visible–near-infrared…
-
Journal Article
Comparing Visible–Near-Infrared Spectroscopy and a Pedotransfer Function for Predicting the Dry Region of the Soil-Water Retention Curve
The soil-water retention curve (SWRC) at the dry end, also known as soil water vapor sorption isotherms, is essential for the modeling of water vapor transport, microbial activity, and biological processes such as plant water uptake in the vadose zone. Measurement of detailed soil water vapor…
-
Journal Article
Predicting the Campbell Soil Water Retention Function: Comparing Visible–Near-Infrared Spectroscopy with Classical Pedotransfer Function
The soil water retention curve (SWRC) is essential for the modeling of water flow and chemical transport in the vadose zone. The Campbell function and its (pore-size distribution index) parameter fitted to measured data is a simple method to quantify retention under relatively moist conditions…
-
Journal Article
Combining visible near‐infrared spectroscopy and water vapor sorption for soil specific surface area estimation
Abstract The soil specific surface area (SSA) is a fundamental property governing a range of soil processes relevant to engineering, environmental, and agricultural applications. A method for SSA determination based on a combination of visible near‐infrared spectroscopy (vis‐NIRS) and vapor…
-
Journal Article
Physics‐Informed Neural Networks for Estimating a Continuous Form of the Soil Water Retention Curve From Basic Soil Properties
Abstract This paper presents a novel physics‐informed neural network (PINN) approach for developing pedotransfer functions (PTFs) to predict continuous soil water retention curves (SWRCs) based on soil textural fractions, organic carbon content, and bulk density. In contrast to conventional…
-
Journal Article
Mapping potential water repellency of Danish topsoil
Soil water repellency (SWR) is a natural process and affects water dynamics from nano to ecosystem scales. However, the spatial distribution of SWR at the ecosystem scale, as well as the underlying drivers across diverse habitats, land uses and soil textures, remain underexplored. This study…