KMap
I am a Soil and Environmental Physicist and work on advancing the management of natural and agricultural ecosystems within the context of a changing global climate. My current research is mainly focused on remote sensing of land surface properties (e.g., soil moisture and evapotranspiration) and the optimization and management of soilless culture production systems.
Courses
  • MME
    Modeling of Mass and Energy Flow in Soils

  • SP
    Soil Physics

Student Thesis/Dissertation
  • Physicochemical and Hydraulic Characterization of Soilless Greenhouse Substrates and Modeling of Flow and Transport in Soilless Substrate Growth Modules with High Performance Computing

    2021

    doctoral
  • Image Segmentation and Analysis Methods and Their Evaluation on Synthesized Porous Media Data

    2018

    doctoral
Grants
  • Funding agency logo
    A Novel Approach to Remote Sensing of Evapotranspiration to Improve Water Use Efficiency Across Crop Production Systems

    Principal Investigator (PI)

    2020

    $499.0K
    Active
  • Funding agency logo
    Collaborative Research: Novel In Situ Measurement and Remote Sensing Techniques for Characterization of Near-Surface Soil Hydrology

    Principal Investigator (PI)

    2015

    $324.3K
  • Funding agency logo
    Acquisition of an Instrumentation Array to Monitor and Model Water, Carbon and Energy Fluxes at the Hillslope Scale in the Landscape Evolution....

    Co-Investigator (COI)

    2014

    $188.2K
  • Funding agency logo
    Optimization of Advanced Greenhouse Substrates Based on Physicochemical Characterization, Numerical Simulations, and Tomato Growth Experiments

    Principal Investigator (PI)

    2014

    $153.0K
  • Funding agency logo
    Novel Measurement Techniques for Continuous Monitoring of Greenhouse Gas Emissions From Agricultural Feeding Operations in the Western U.S.

    Principal Investigator (PI)

    2010

    $278.8K
  • Funding agency logo
    A Novel Approach to Quantifying Soil Evaporation Rates With High Resolution and Thermal Imaging and Heat Flux Measurements

    Principal Investigator (PI)

    2009

    $447.9K
  • Funding agency logo
    Development of Efficient X-Ray CT Image Segmentation Techniques for Quantitative Analysis of Phase Distribution and Flow Processes in Porous Media

    Principal Investigator (PI)

    2009

    $249.8K
  • Funding agency logo
    Upgrade of Weighing Lysimeter Facility for Studying Ecosystem and Vadose Zone Dynamics in Arid Environments

    Principal Investigator (PI)

    2008

    $296.1K
Publications (165)
Recent
  • Towards the effects of moss-dominated biocrusts on surface soil aeration in drylands: Air permeability analysis and modeling

    2023

  • Contribution of organic carbon to the total specific surface area of soils with varying clay mineralogy

    2023

  • The Feasibility of Remotely Sensed Near-Infrared Reflectance for Soil Moisture Estimation for Agricultural Water Management

    2023

  • Specific surface area of soils with different clay mineralogy can be estimated from a single hygroscopic water content

    2023

  • Cation Exchange Capacity and Soil Pore System Play the Key Role in Water Vapour Sorption

    2022

  • Short- and mid-term forecasts of actual evapotranspiration with deelearning

    2022

  • A novel physical-empirical model linking shortwave infrared reflectance and soil water retention

    2022

  • Combining Vis–NIR spectroscopy and advanced statistical analysis for estimation of soil chemical properties relevant for forest road construction

    2021

  • Estimation of soil specific surface area from adsorbed soil water content

    2021

  • Estimating specific surface area: Incorporating the effect of surface roughness and probing molecule size

    2021

  • Adaptation and validation of the ParSWMS numerical code for simulation of water flow and solute transport in soilless greenhouse substrates

    2021

  • Information depth of NIR/SWIR soil reflectance spectroscopy

    2021

  • Estimation of root zone soil moisture from ground and remotely sensed soil information with multisensor data fusion and automated machine learning

    2021

  • Incorporating effects of surface roughness and probing molecule size for estimation of soil specific surface area

    2021

  • Linking water vapor sorption to water repellency in soils with high organic carbon contents

    2021

  • Effects of increasing water activity on the relationshibetween water vapor sorption and clay content

    2021

  • The feasibility of shortwave infrared imaging and inverse numerical modeling for rapid estimation of soil hydraulic properties

    2021

  • The Effects of Irrigation Frequency on Water and Heat Regimes in Different Substrates and their Mixtures: Tomato as a Case Study

    2021

  • Estimating Atterberg limits of soils from hygroscopic water content

    2021

  • Clay content and mineralogy, organic carbon and cation exchange capacity affect water vapour sorption hysteresis of soil

    2020

  • Combining visible near-infrared spectroscopy and water vapor sorption for soil specific surface area estimation

    2020

  • A new mathematical formulation for remote sensing of soil moisture based on the Red-NIR space

    2020

  • Characterization of Physicochemical and Hydraulic Properties of Organic and Mineral Soilless Culture Substrates and Mixtures

    2020

  • Water cycling pools and movement) through an enclosed tropical forest in response to drought.

    2020

  • A New Optical Remote Sensing Technique for High-Resolution Mapping of Soil Moisture

    2019

  • Global Estimates of Land Surface Water Fluxes from SMOS and SMAP Satellite Soil Moisture Data

    2019

  • Improved estimation of clay content from water content for soils rich in smectite and kaolinite

    2019

  • The Paramount Societal Impact of Soil Moisture

    2019

  • Inorganic and synthetic organic components of soilless culture and potting mixtures

    2019

  • Ground, Proximal, and Satellite Remote Sensing of Soil Moisture

    2019

  • An analytical model for estimation of land surface net water flux from near-surface soil moisture observations

    2019

  • Global environmental changes impact soil hydraulic functions through biophysical feedbacks

    2019

  • Application of Satellite Remote Sensing for Estimation of Dust Emission Probability in the Urmia Lake Basin in Iran

    2019

  • Particle size effects on soil reflectance explained by an analytical radiative transfer model

    2018

  • Mapping soil moisture with the OPtical TRApezoid Model OPTRAM) based on long-term MODIS observations

    2018

  • Modeling Moisture and Temperature Dependent Emissions of Carbon Dioxide and Methane from Drying Dairy Cow Manure

    2018

  • A Novel Shortwave Infrared Proximal Sensing Approach to Quantify the Water Stability of Soil Aggregates

    2018

  • Applicability of the Guggenheim-Anderson-Boer water vapour sorption model for estimation of soil specific surface area

    2018

  • Hydraulic conductivity of stratified unsaturated soils: Effects of random variability and layering

    2017

  • Advancing NASA's AirMOSS P-Band Radar Root Zone Soil Moisture Retrieval Algorithm via Incorporation of Richards' Equation

    2017

  • Prediction of the soil water retention curve for structured soil from saturation to oven-dryness

    2017

  • Applicability of the Guggenheim–Anderson–Boer water vapour sorption model for estimation of soil specific surface area

    2017

  • A TDR Array Probe for Monitoring Near-surface Soil Moisture Distribution

    2017

  • The optical trapezoid model: A novel approach to remote sensing of soil moisture applied to Sentinel-2 and Landsat-8 observations

    2017

  • Retrieval of AirMOSS Root-Zone Soil Moisture Profile with a Richards' Equation-Based Approach

    2017

  • High Resolution Shortwave Infrared Imaging of Water Infiltration into Dry Soil

    2017

  • Prediction of biopore- and matrix-dominated flow from X-ray CT-derived macropore network characteristics

    2016

  • Advancing NASA’s AirMOSS P-Band Radar Root Zone Soil Moisture Retrieval Algorithm via Incorporation of Richards’ Equation

    2016

  • A Critical Evaluation of the Miller and Miller Similar Media Theory for Application to Natural Soils

    2016

  • Predicting Near-Surface Moisture Content of Saline Soils from Near-Infrared Reflectance Spectra with a Modified Gaussian Model

    2016

  • Evaluation of theoretical and empirical water vapor sorption isotherm models for soils

    2015

  • Macropore flow at the field scale: predictive performance of empirical models and X-ray CT analyzed macropore characteristics

    2015

  • Adsorption and capillary processes in variably saturated porous media-pore scale hydrostatic and hydrodynamic considerations

    2015

  • Effects of CT Number Derived Matrix Density on Preferential Flow and Transport in a Macroporous Agricultural Soil

    2015

  • Prediction of clay content from water vapour sorption isotherms considering hysteresis and soil organic matter content

    2015

  • A New Two-Stage Approach to predicting the soil water characteristic from saturation to oven-dryness

    2015

  • The Landscape Evolution Observatory: A large-scale controllable infrastructure to study Earth-surface processes.

    2015

  • Reply to comments on Column-scale unsaturated hydraulic conductivity estimates in coarse-textured homogeneous and layered soils derived under steady-state evaporation from a water table J. Hydrol. 519 2014) 1238-1248]

    2015

  • Quantification of soil pore network complexity with X-ray computed tomography and gas transport measurements

    2015

  • Effects of Soil Compaction and Organic Carbon Content on Preferential Flow in Loamy Field Soils

    2015

  • Effects of biochar and manure amendments on water vapor sorption in a sandy loam soil

    2015

  • Effects of soil bulk density on gas transport parameters and pore-network properties across a sandy field site

    2015

  • Soil structure and microbial activity dynamics in 20-month field-incubated organic-amended soils

    2014

  • New Perspectives for the Application of High-Resolution BenchtoX-Ray MicroCT for Quantifying Void, Solid and Liquid Phases in Soils

    2014

  • Physical and thermal characteristics of dairy cattle manure

    2014

  • Gas diffusion-derived tortuosity governs saturated hydraulic conductivity in sandy soils

    2014

  • On the value of soil resources in the context of natural capital and ecosystem service delivery

    2014

  • Rapid and Fully Automated Measurement of Water Vapor Sorption Isotherms: New Opportunities for Vadose Zone Research

    2014

  • Column-Scale Unsaturated Hydraulic Conductivity Estimates in Coarse-Textured Homogeneous and Layered Soils Derived under Steady-State Evaporation from a Water Table

    2014

  • Impact of long-term fertilization practice on soil structure evolution

    2014

  • Simultaneous loss of soil biodiversity and functions along a copper contamination gradient: When soil goes to sleep

    2014

  • Methods and Techniques for Measuring Gas Emissions from Agricultural and Animal Feeding Operations

    2014

  • Modeling gravity effects on water retention and gas transport characteristics in plant growth substrates

    2014

  • Relating soil specific surface area, water film thickness, and water vapor adsorption

    2014

  • Evaluation of a Fully Automated Analyzer for Rapid Measurement of Water Vapor Sorption Isotherms for Applications in Soil Science

    2014

  • Soil Structure Regeneration and Microbial Activity in 20-Month Field-Incubated Organic-Amended Soils of Varying Clay Mineralogy

    2014

  • Pore Structure of Natural and Regenerated Soil Aggregates: An X-Ray Computed Tomography Analysis

    2014

  • Soil specific surface area and non-singularity of soil-water retention at low saturations

    2013

  • Segmentation of X-Ray CT Data of Porous Materials: A Review of Global and Locally Adaptive Algorithms

    2013

  • Gas Diffusivity-Based Design and Characterization of Greenhouse Growth Substrates

    2013

  • Electromagnetic induction for mapping textural contrasts of mine tailing deposits

    2013

  • Integral parameters for characterizing water, energy, and aeration properties of soilless plant growth media

    2013

  • Design and Characterization of Greenhouse Growth Substrates Based on Gas Diffusivity

    2013

  • Density and permeability of a loess soil: Long-term organic matter effect and the response to compressive stress

    2013

  • Evaluation of Standard Calibration Functions for Eight Electromagnetic Soil Moisture Sensors

    2013

  • Measurement Accuracy of a Multiplexed Portable FTIR-Surface Chamber System for Estimating Gas Emissions

    2013

  • Monitoring Temporal Variations In Greenhouse and Regulated Gas Emissions From Cow Manure In Relation to Moisture Content and Temperature

    2012

  • A New Algorithm for Determining Soil Evaporation Using Heat Pulse Probe Measurements

    2012

  • Temporal Variations in Greenhouse Gas Emissions from Dairy and Beef Cow Manure

    2012

  • Natural Capital, Ecosystem Services, and Soil Change: Why Soil Science Must Embrace an Ecosystems Approach

    2012

  • Beyond earth: Designing root zone environments for reduced gravity conditions

    2012

  • Determination of Subsurface Soil Evaporation using a Heat Pulse Probe Array

    2012

  • A multiplexing system for monitoring greenhouse and regulated gas emissions from manure sources using a portable FTIR gas analyzer

    2012

  • Application of High-Resolution Thermal Imaging and Novel Heat Pulse Technology to Quantify Soil Evaporation

    2012

  • Simple Predictive Models for Saturated Hydraulic Conductivity of Technosands

    2012

  • Soil architecture and physicochemical functions: An introduction

    2012

  • Robotic lake lander test bed for autonomous surface and subsurface exploration of Titan lakes

    2012

  • Hygroscopic Water Content as a Surrogate for Clay Percentage in Proximal Soil Sensing

    2012

  • Predicting Soil-Water Characteristics from Volumetric Contents of Pore-Size Analogue Particle Fractions

    2012

  • Comparison of Commonly-Applied Electromagnetic Sensors for Soil Water Content and Electrical Conductivity Measurements in Mineral, Organic and Saline Soils

    2012

  • Metal Oxide Gas Sensor Performance Compared with a FTIR Gas Analyzer for Monitoring Regulated and Greenhouse Gas Emissions from Manure Sources

    2012

  • Estimation of soil clay content from hygroscopic water content measurements

    2012

  • Unsupervised 3-D Multiphase Segmentation of X-Ray CT Data of Porous Materials

    2012

  • Prediction of the Soil Water Characteristic from Soil Particle Volume Fractions

    2012

  • Alternating Partial Soil Surface Wetting to Optimize Leaching A Model Analysis

    2012

  • An Automated Microlysimeter for Long-Term Monitoring of Soil Evaporation

    2011

  • Numerical evaluation of subsurface soil water evaporation derived from sensible heat balance

    2011

  • An Advanced Bayesian Algorithm for Multiphase Segmentation of 3-D X-Ray Micro Computed Tomography Data of Porous Materials

    2011

  • Partitioning Evaporation and Infiltration Processes with an Array of Multifunction Heat Pulse Probes

    2011

  • Relationshibetween specific surface area and the dry end of the water retention curve for soils with varying clay and organic carbon contents

    2011

  • Evaluation of an Advanced BenchtoMicro-Computed Tomography System for Quantifying Porosities and Pore-Size Distributions of Two Brazilian Oxisols

    2011

  • Quantification and Monitoring of Gas Emission from Agricultural Sources: Measurement Technology and Limitations

    2011

  • Modeling and correction of soil penetration resistance for varying soil water content

    2011

  • Physicochemical controls on initiation and evolution of desiccation cracks in sand-bentonite mixtures: X-ray CT imaging and stochastic modeling

    2011

  • Greenhouse Gas Emissions from Agriculture and Animal Operations: Influencing Factors, Measurement Limitations, and Potential Mitigation Strategies

    2011

  • Geophysical Characterization of Inactive Mine Tailings A First Stefor Revegetation

    2011

  • Evaluation of Electromagnetic Sensors Using Acetic Acid/Water Mixtures Dielectric Constant and Electrical Conductivity Responses

    2011

  • Three-Dimensional Multiphase Segmentation of X-Ray CT Data of Porous Materials Using a Bayesian Markov Random Field Framework

    2011

  • Erratum: Numerical evaluation of subsurface soil water evaporation derived from sensible heat balance Water Resources Research 2011) 47 W02547) DOI: 10.1029/2010WR009866)

    2011

  • Metal Oxide Gas Sensors for Monitoring Regulated and Greenhouse Gas Fluxes from Manure Sources

    2011

  • Evaluation of Commercially Available Electromagnetic Sensors for Measuring Soil Water Content and Electrical Conductivity in Mineral, Organic and Saline Soils

    2011

  • Gas Diffusivity-Based Analysis of Tomato Growth Media

    2011

  • A New Generation of High-Resolution BenchtoMicro-CT Scanners for Application in Earth Sciences

    2011

  • A Penta-Needle Heat Pulse Probe Array for Soil Subsurface Evaporation and Heat Flux Estimates

    2011

  • Application of segmentation for correction of intensity bias in x-ray computed tomography images

    2010

  • Multifractal analysis of discretized X-ray CT images for the characterization of soil macropore structures

    2010

  • Quantitative Pore-Scale Investigations of Multiphase Bio/Geo/Chemical Processes

    2010

  • The Application of X-ray Computed Tomography for Characterization of Surface Crack Networks in Bentonite-Sand Mixtures

    2010

  • Providing optimal root-zone fluid fluxes: Effects of hysteresis on capillary-dominated water distributions in reduced gravity

    2009

  • Liquid behavior in partially saturated porous media under variable gravity

    2009

  • Multifractal features of 3D macropore geometry of structured soil columns with X-ray computer tomography

    2009

  • Economical and environmental implications of solid waste compost applications to agricultural fields in Punjab, Pakistan

    2009

  • Segmentation of X-ray computed tomography images of porous materials: A crucial stefor characterization and quantitative analysis of pore structures

    2009

  • Physical Characterization of Greenhouse Substrates for Automated Irrigation Management

    2008

  • Measurements and Modeling of variable gravity effects on water distribution and flow in unsaturated porous media

    2007

  • Hydraulic properties of swelling clay-sand mixtures: Microscale modeling and measurements

    2006

  • Linking the Gardner and Campbell models for water retention and hydraulic conductivity in near-saturated soil

    2006

  • Sampling silica and ferrihydrite colloids with fiberglass wicks under unsaturated conditions

    2006

  • Reply to comment by Stefan Finsterle on Seepage into drifts and tunnels in unsaturated fractured rock

    2006

  • Water films and scaling of soil characteristic curves at low water contents

    2005

  • Physical and hydraulic properties of baked ceramic aggregates used for plant growth medium

    2005

  • Seepage into drifts and tunnels in unsaturated fractured rock

    2005

  • Challenges to understanding fluid behavior in plant growth media under microgravity

    2005

  • Measurement of porous media hydraulic properties during parabolic flight induced microgravity

    2005

  • Field methods for monitoring solute transport

    2004

  • Flow and Distribution of Fluid Phases Through Porous Plant Growth Media In Microgravity

    2004

  • Liquid-Gas Interfacial Configurations in Angular Pores Under Microgravity

    2004

  • Water Retention and Characteristic Curve

    2004

  • Reply to comment by N. Kartal Toker, John T. Germaine, and Patricia J. Culligan on Cavitation during desaturation of porous media under tension"

    2003

  • Hydraulic conductivity of partially saturated fractured porous media: Flow in a cross-section

    2003

  • Hydraulic functions for swelling soils: Pore scale considerations

    2003

  • Flow and distribution of fluid phases through porous plant growth media in microgravity: Progress to date

    2002

  • Unsaturated hydraulic conductivity of structured porous media: A review of liquid configuration-based models

    2002

  • Cavitation during desaturation of porous media under tension

    2002

  • Adsorption and capillary processes in variably saturated porous media pore scale hydrostatic and hydrodynamic considerations

    2001

  • Hydraulic conductivity of variably saturated porous media: Film and corner flow in angular pore space

    2001

  • Hydraulic functions for macroporous soils

    2000

  • Flow in unsaturated fractured porous media: Hydraulic conductivity of rough surfaces

    2000

  • Liquid retention and interfacial area in variably saturated porous media: Upscaling from single-pore to sample-scale model

    1999

  • Adsorption and capillary condensation in porous media: Liquid retention and interfacial configurations in angular pores

    1999

  • Measurement of volumetric soil water content under field conditions with TDR and gypsum blocks

    1997

  • Measurement of volumetric soil water content under field conditions with TDR and gypsum blocks Wasseranteilsbestimmung unter feldbedingungen mittels time domain reflectometry und gipsblöcken

    1997

  • FIELD TESTING SITES FOR THE EVALUATION OF NITRATE LEACHING IN AGRICULTURAL AREAS

    1992

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