A5072723737- Hydrology and Watershed Management Studies
- Soil and Water Nutrient Dynamics
- Crop Yield and Soil Fertility
- Soil Carbon and Nitrogen Dynamics
- Plant Water Relations and Carbon Dynamics
- Soil Moisture and Remote Sensing
- Soil erosion and sediment transport
- Geophysical Methods and Applications
- Plant responses to elevated CO2
- Bioenergy crop production and management
- Climate change impacts on agriculture
- Soil and Unsaturated Flow
- Infrastructure Maintenance and Monitoring
- Plant Ecology and Soil Science
- Forest ecology and management
- Urban Heat Island Mitigation
- Forest Biomass Utilization and Management
- Seismic Waves and Analysis
- Peatlands and Wetlands Ecology
- Remote Sensing and LiDAR Applications
- Land Use and Ecosystem Services
- Fire effects on ecosystems
- Flood Risk Assessment and Management
- Plant nutrient uptake and metabolism
- Geotechnical Engineering and Underground Structures
Keimyung University
2021-2024
University of Illinois Urbana-Champaign
2014-2022
Lawrence Berkeley National Laboratory
2018-2020
Abstract Threshold changes in rainfall‐runoff generation commonly represent shifts runoff mechanisms and hydrologic connectivity controlling water solute transport transformation. In watersheds with limited human influence, threshold responses reflect interaction between precipitation event antecedent soil moisture. Similar analyses are lacking intensively managed landscapes where installation of subsurface drainage tiles has altered the land surface, groundwater, streams, application...
Study Region: Hapcheon and Seomjingang Basins, South Korea Focus: This study investigated the impacts of climate change on water supply reliability flood risk in two East Asian basins Korea. By employing three coupled hydrological reservoir operation models, analysis considered projections under SSP2-4.5 SSP5-8.5, projected using 12 global models. New Hydrological Insights: Our results indicated that SSP2-4.5, did not considerably decrease compared to historical period (1995–2014), whereas...
Core Ideas IML‐CZO is structured to study system responses through event‐based monitoring. Management legacy has shaped critical zone processes. and weather affect landscape heterogeneity surface–subsurface pathways. In intensively managed landscapes, interactions between surface (tillage) subsurface (tile drainage) management with prevailing climate/weather alter characteristics, transport pathways, transformation rates of surface/subsurface water, soil/sediment, particulate/dissolved...
Abstract We explore the impacts of tile drains in agricultural fields on coupled age and concentration dynamics nitrate, immobile ammonium, mobile ammonia nonreactive tracers such as chloride. implement two interacting pore domains to capture matrix preferential flow paths a ecohydrology biogeochemistry model, Dhara . apply this model an farm that utilizes corn‐soybean rotation Midwestern United States located Intensively Managed Landscapes Critical Zone Observatory. In general, we observe...
Vegetation canopy structure plays an important role in the partitioning of incident solar radiation, photosynthesis, transpiration, and other scalar fluxes. The vertical foliage distribution plant is represented by leaf area density (LAD), which defined as one-sided per unit volume. Airborne light detection ranging (LiDAR) offers possibility to characterize 3-D variation LAD over space, still remains a challenge estimate. Moreover, low point cloud data generally offered airborne LiDAR may be...
Abstract The multifaceted interface of plant roots, microbes, water, and soil can be considered a critical zone within the Critical Zone as it is host to many important dynamically linked processes, including promotion nutrient cycling through absorption rhizodeposition, interaction feedbacks with microorganisms fungi, root‐facilitated hydraulic redistribution, carbon dynamics. Such processes in have not been fully characterized modeled an ecohydrologic framework linking above‐ground natural...
Because of increasing demands for bioenergy, a considerable amount land in the midwestern United States could be devoted to cultivation second-generation bioenergy crops, such as switchgrass and miscanthus. The foliar carbon/nitrogen ratio (C/N) these crops at harvest is significantly higher than ratios replaced corn or soybean. We show that there critical soil organic matter C/N ratio, where microbial biomass can impaired microorganisms become dependent upon net immobilization. simulation...
Abstract How does the variability of topography structure spatial heterogeneity nutrient dynamics? In particular, what role micro‐topographic depression play in and temporal dynamics nitrate, ammonia, ammonium? We explore these questions using 3‐D simulation their joint concentration age. To explicitly resolve its control on moisture, vegetation, carbon‐nitrogen dynamics, we use a high‐resolution LiDAR data over an agricultural site under corn‐soybean rotation Intensively Managed landscapes...
Abstract Excess reactive nitrogen in soils of intensively managed landscapes causes adverse environmental impact, and continues to remain a global concern. Many novel strategies have been developed provide better management practices and, yet, the problem remains unresolved. The objective this study is develop model characterize “age” inorganic soil‐nitrogen (nitrate, ammonia/ammonium). We use general theory age, which provides an assessment time elapsed since has introduced into soil...
Abstract Soil organic carbon (SOC) is going through rapid reorganization due to anthropogenic influences. Understanding how biogeochemical transformation and erosion‐induced SOC redistribution influence profiles stocks critical our food security adaptation climate change. The important roles of erosion deposition on dynamics have drawn increasing attention in the past decades, but quantifying such still challenging. Here we develop a process‐based quasi 3‐D model that couples surface runoff,...
Forests have the largest terrestrial nutrient pools. The loss of soil carbon and nitrogen in forests under ongoing climate warming is subject to severe environmental degradation. To mitigate negative effects global on forest, it important obtain a better understanding how elevated temperature altered precipitation variability impact dynamics. explore such interactions, we coupled an eco-hydrological model (Multi-Layer Canopy model, MLCan) with biogeochemical applied combined Pinus densiflora...
Subsurface drainage pipes are commonly used in the Midwestern United States to reduce excess soil moisture and improve crop yields. However, they considerable source of nonpoint pollution due nutrient losses. Detecting locations is crucial for water quality management, but information about pipe maps often privately owned unavailable. In this study, we propose an ensemble learning approach that uses eight fully convolutional networks (FCNs), including well-known architectures such as Unet,...
There has been an increasing recognition of the crucial role forests, responsible for sequestering atmospheric CO2, as a moral imperative mitigating pace climate change. The complexity evaluating change impacts on forest carbon and water dynamics lay in diverse acclimations forests to changing environments. In this study, we assessed two most common acclimation traits, namely leaf area index maximum rate carboxylation (Vcmax), explore potential pathways Pinus koraiensis under We used...
Abstract More than a 60% increase in crop production is required by the 2050's to feed growing world population. Understanding how plant functional traits and field management affect yields has potential improve agricultural productivity, minimize economic environmental losses, maximize food security. We explored influence of winter wheat root characteristics on growth, yield, profit using mechanistic well‐tested ecosystem model, ecosys . applied further tested at an farm Ardmore, Oklahoma,...
Soil moisture has been considered a key variable in governing the terrestrial ecosystem. However, it is challenging to preserve indigenous soil characteristics using conventional monitoring methods that require maximum contacts. To overcome this issue, we developed non-destructive method of evaluating contactless ultrasonic system. This system was designed measure leaky Rayleigh waves at air-soil joint-half space. The influences on were explored under sand, silt, and clay controlled...