Article
Remote Sensing
L. Toca, K. Morrison, R. R. E. Artz, A. Gimona, T. Quaife
Summary: Carbon storage and active carbon sequestration in peatlands are influenced by water table depth and soil moisture availability. Synthetic aperture radar (SAR) is an efficient way to monitor the hydrological condition of peatland ecosystems. Radar backscatter amplitude and phase are sensitive to changes in water table level and soil moisture.
INTERNATIONAL JOURNAL OF REMOTE SENSING
(2022)
Article
Soil Science
Yaji Wang, Lei Gao, Shangshu Huang, Xinhua Peng
Summary: The study investigated the influence of rainfall types and antecedent soil moisture on runoff generation on a 150-m hillslope in the red soil region of China. The results showed that both the rainfall types and antecedent soil moisture significantly affected the accuracy of runoff modeling. The study also identified a runoff generation threshold within a specific range of antecedent soil water storage and rainfall amount.
EUROPEAN JOURNAL OF SOIL SCIENCE
(2022)
Article
Environmental Sciences
Tetsu K. Tokunaga, Ahn Phuong Tran, Jiamin Wan, Wenming Dong, Alexander W. Newman, Curtis A. Beutler, Wendy Brown, Amanda N. Henderson, Kenneth H. Williams
Summary: Quantifying flow and transport from hillslopes is crucial for understanding water quantity and quality in rivers, but the limited subsurface measurements make it not clear enough. Optimizing subsurface flux predictions and pore water chemistry profiles over multiple years can predict the time-dependent rates of solute exports from hillslopes.
WATER RESOURCES RESEARCH
(2022)
Article
Engineering, Civil
Feng Wang, Jihui Gao
Summary: This study quantitatively investigated the impacts of PV panels on rainfall-runoff and soil erosion processes on a plot-scale slope through rainfall simulation experiments. The results showed that although the soil surface under the PV panel was rougher, there were no significant differences in runoff volume, peak flow discharge rate, and overland flow velocity between the panel slope and the control slope. However, the slope with the PV panel had significantly less sediment flux at the outlet, especially under heavy rainfall, due to the weakened splash erosion caused by the rainfall interception by the panel.
JOURNAL OF HYDROLOGY
(2023)
Article
Water Resources
A. L. Kay, M. J. Brown
Summary: In this study, a hydrological model is driven by observation-based hourly data and high-resolution climate model data to simulate river flows. The results show that the use of observation-based hourly data improves the accuracy of high flows and peak flow bias, but has little effect on low flows. The future changes in peak flows are slightly larger when driven by hourly climate model precipitation compared to equally-disaggregated daily data.
JOURNAL OF HYDROLOGY-REGIONAL STUDIES
(2023)
Article
Geosciences, Multidisciplinary
Ava Mombini, Nosratollah Amanian, Ali Talebi, Mahboobeh Kiani-Harchegani, Jesus Rodrigo-Comino
Summary: The study demonstrates the significant impact of surface roughness on soil loss and sediment arrival time, with different complex hillslope systems exhibiting distinct characteristics under changes in surface roughness.
Article
Environmental Sciences
Felipe Quintero, Nicolas Velasquez
Summary: This paper introduces the HLM-Tetis model structure and its improvements over the previous HLM model structure. By adding modules to simulate snow processes, improving flexibility in simulating infiltration and percolation, and enhancing flexibility in deriving total runoff, the model has been applied to flood events in five basins in Iowa where previous model structures had limitations.
Article
Geosciences, Multidisciplinary
Ralf Loritz, Markus Hrachowitz, Malte Neuper, Erwin Zehe
Summary: This study found that distributed rainfall improves model performance during convective summer storms. The use of a spatially adaptive model can represent varying relevance of distributed rainfall without reducing predictive performance, potentially reducing computational times and enhancing understanding of the role and value of distributed precipitation data in hydrological models.
HYDROLOGY AND EARTH SYSTEM SCIENCES
(2021)
Article
Engineering, Civil
Jie Wang, Li Chen
Summary: This study investigates the impact of hillslope geometry on Hortonian rainfall-runoff processes. Different geometrical characteristics can lead to variations in runoff and infiltration processes. Current rainfall infiltration prediction methods may have errors when applied to hillslopes with curved profiles and variable widths.
JOURNAL OF HYDROLOGY
(2021)
Article
Environmental Sciences
Din Danino, Tal Svoray, Sally Thompson, Ariel Cohen, Octavia Crompton, Elazar Volk, Eli Argaman, Asher Levi, Yafit Cohen, Kfir Narkis, Shmuel Assouline
Summary: This paper discusses how to quantify the spatial patterns of shallow overland flow through thermal imaging and LiDAR scanning techniques, which is important for understanding overland flow patterns in arid regions. The experimental results show that different slopes, roughness, and soil permeability properties can lead to different overland flow patterns. High-permeability soil patches significantly regulate overland flow.
WATER RESOURCES RESEARCH
(2021)
Article
Engineering, Civil
Sheng Wang, Yan Yan, Zhiyong Fu, Hongsong Chen
Summary: The study reveals the unique threshold-like runoff responses to rainfall inputs on karst slope, where epikarst seepage runoff plays a crucial role in regulating flow functions. Soil depth directly affects surface runoff, while identifying the factors controlling rainfall-induced subsurface runoff remains a challenge. Nonlinear hydrological behaviors such as the 'hockey stick', 'heaviside' function, and sigmoid function were observed, suggesting the complexity of karst hydrological systems.
JOURNAL OF HYDROLOGY
(2022)
Article
Environmental Sciences
Fabian Maier, Ilja van Meerveld
Summary: The study shows that the characteristics of overland flow (OF) and sediment transport change significantly during landscape evolution. In the oldest moraines, OF ratios are the largest, while occurrence of OF is more frequent on the youngest moraines.
WATER RESOURCES RESEARCH
(2021)
Article
Environmental Sciences
Martin Gauch, Frederik Kratzert, Oren Gilon, Hoshin Gupta, Juliane Mai, Grey Nearing, Bryan Tolson, Sepp Hochreiter, Daniel Klotz
Summary: Building accurate rainfall-runoff models is crucial in hydrological science and practice. In this study, expert opinions were compared with quantitative metrics, and it was found that experts generally agreed with the metrics and showed a preference for Machine Learning models over traditional hydrological models. Although there were inconsistencies in expert opinions, where there was agreement, the opinions could be predicted from the quantitative metrics.
WATER RESOURCES RESEARCH
(2023)
Article
Environmental Sciences
M. S. Pleasants, F. dos A. Neves, A. D. Parsekian, K. M. Befus, T. J. Kelleners
Summary: This study uses synthetic and field-collected, time-lapse ERT data to determine hydraulic parameters of a vertical flow model in mountainous environments. Results show that ERT data can recover hydraulic parameters to a certain extent, but struggle to capture groundwater levels.
WATER RESOURCES RESEARCH
(2022)
Article
Water Resources
Conrado Tobon, L. Adrian Bruijnzeel
Summary: Tropical montane cloud forests receive additional water inputs from fog and wind-driven rain, leading to high soil moisture levels that promote rapid subsurface flow. Despite covering 6.6% of remaining montane tropical forests, the hydrological functioning of TMCF hillslopes has rarely been studied.
HYDROLOGICAL PROCESSES
(2021)
Article
Environmental Sciences
Brittany A. Verbeke, Louis J. Lamit, Erik A. Lilleskov, Suzanne B. Hodgkins, Nathan Basiliko, Evan S. Kane, Roxane Andersen, Rebekka R. E. Artz, Juan C. Benavides, Brian W. Benscoter, Werner Borken, Luca Bragazza, Stefani M. Brandt, Suzanna L. Braeuer, Michael A. Carson, Dan Charman, Xin Chen, Beverley R. Clarkson, Alexander R. Cobb, Peter Convey, Jhon del Aguila Pasquel, Andrea S. Enriquez, Howard Griffiths, Samantha P. Grover, Charles F. Harvey, Lorna Harris, Christina Hazard, Dominic Hodgson, Alison M. Hoyt, John Hribljan, Jyrki Jauhiainen, Sari Juutinen, Klaus-Holger Knorr, Randall K. Kolka, Mari Kononen, Tuula Larmola, Carmody K. McCalley, James McLaughlin, Tim R. Moore, Nadia Mykytczuk, Anna E. Normand, Virginia Rich, Nigel Roulet, Jessica Royles, Jasmine Rutherford, David S. Smith, Mette M. Svenning, Leho Tedersoo, Pham Q. Thu, Carl C. Trettin, Eeva-Stiina Tuittila, Zuzana Urbanova, Ruth K. Varner, Meng Wang, Zheng Wang, Matt Warren, Magdalena M. Wiedermann, Shanay Williams, Joseph B. Yavitt, Zhi-Guo Yu, Zicheng Yu, Jeffrey P. Chanton
Summary: This study examined variations in the organic matter functional groups of peat samples collected from different latitudes and elevations using Fourier Transform Infrared Spectroscopy. The results showed that peat from high latitudes had higher carbohydrate content, while peat from low latitudes had higher aromatic content. For peat from similar latitudes but different elevations, higher elevations had higher carbohydrate content and lower aromatic content. These findings are important for understanding the response of peatland soil to climate change.
GLOBAL BIOGEOCHEMICAL CYCLES
(2022)
Article
Environmental Sciences
Linden B. Huhmann, Charles F. Harvey, Ana Navas-Acien, Joseph Graziano, Vesna Slavkovich, Yu Chen, Maria Argos, Habibul Ahsan, Alexander van Geen
Summary: The study aims to improve exposure assessment by estimating the fraction of drinking water that comes from wells other than the household's primary well, and reveals that for participants with lower arsenic concentrations in their primary household wells, arsenic in drinking water is the main source of exposure.
JOURNAL OF EXPOSURE SCIENCE AND ENVIRONMENTAL EPIDEMIOLOGY
(2022)
Article
Meteorology & Atmospheric Sciences
S. Apers, G. J. M. De Lannoy, A. J. Baird, A. R. Cobb, G. C. Dargie, J. Pasquel, A. Gruber, A. Hastie, H. Hidayat, T. Hirano, A. M. Hoyt, A. J. Jovani-Sancho, A. Katimon, A. Kurnain, R. D. Koster, M. Lampela, S. P. P. Mahanama, L. Melling, S. E. Page, R. H. Reichle, M. Taufik, J. Vanderborght, M. Bechtold
Summary: Tropical peatlands are carbon-dense ecosystems and their water storage dynamics have a significant impact on carbon stocks. This study integrated hydrology modules specific to tropical peatlands into a global land surface model. The performance of the model was evaluated using in situ water level and evapotranspiration data, showing overall improvements compared to the default model. However, there were regional differences in performance, likely due to variations in meteorological data accuracy and unaccounted-for peatland hydrologic response.
JOURNAL OF ADVANCES IN MODELING EARTH SYSTEMS
(2022)
Article
Environmental Sciences
Daniel Beene, Philip Collender, Andres Cardenas, Charles Harvey, Linden Huhmann, Yan Lin, Johnnye Lewis, Nancy LoIacono, Ana Navas-Acien, Anne Nigra, Craig Steinmaus, Alexander van Geen
Summary: This article presents a mass-balance approach to assess misclassification of arsenic exposure. Simulating the relationships between arsenic intake and excretion helps to evaluate exposure sources more accurately and identify common causes of misclassification.
ENVIRONMENT INTERNATIONAL
(2022)
Article
Environmental Sciences
Nathan C. Dadap, Alexander R. Cobb, Alison M. Hoyt, Charles F. Harvey, Andrew F. Feldman, Eun-Soon Im, Alexandra G. Konings
Summary: When organic peat soils in Southeast Asian peatlands become dry, they become flammable and can lead to catastrophic fire events. This study used neural networks to model soil moisture and found that future climate change, including reduced precipitation and increased evaporative demand, will decrease soil moisture. This may accelerate peat carbon emissions and suggest that degraded areas with less tree cover are more vulnerable to climate change, highlighting the need for urgent peatland restoration.
ENVIRONMENTAL RESEARCH LETTERS
(2022)
Article
Multidisciplinary Sciences
Shaun Watmough, Spencer Gilbert-Parkes, Nathan Basiliko, Louis J. Lamit, Erik A. Lilleskov, Roxanne Andersen, Jhon Del Aguila-Pasquel, Rebekka E. Artz, Brian W. Benscoter, Werner Borken, Luca Bragazza, Stefani M. Brandt, Suzanna L. Brauer, Michael A. Carson, Xin Chen, Rodney A. Chimner, Bev R. Clarkson, Alexander R. Cobb, Andrea S. Enriquez, Jenny Farmer, Samantha P. Grover, Charles F. Harvey, Lorna Harris, Christina Hazard, Alison M. Hoyt, John Hribljan, Jyrki Jauhiainen, Sari Juutinen, Evan S. Kane, Klaus-Holger Knorr, Randy Kolka, Mari Kononen, Anna M. Laine, Tuula Larmola, Patrick A. Levasseur, Carmody K. McCalley, Jim McLaughlin, Tim R. Moore, Nadia Mykytczuk, Anna E. Normand, Virginia Rich, Bryce Robinson, Danielle L. Rupp, Jasmine Rutherford, Christopher W. Schadt, Dave S. Smith, Graeme Spiers, Leho Tedersoo, Pham Q. Thu, Carl C. Trettin, Eeva-Stiina Tuittila, Merritt Turetsky, Zuzana Urbanova, Ruth K. Varner, Mark P. Waldrop, Meng Wang, Zheng Wang, Matt Warren, Magdalena M. Wiedermann, Shanay T. Williams, Joseph B. Yavitt, Zhi-Guo Yu, Geoff Zahn
Summary: Carbon and nitrogen concentrations vary among different peatland categories, but depth does not have a significant impact on the chemical composition within each category. The study shows that carbon and organic matter concentrations can be predicted based on broadly classified peatland categories, which is important for future research on global peatland carbon and nitrogen stocks.
Article
Environmental Sciences
Lauren D. D. Somers, Alison Hoyt, Alexander R. R. Cobb, Suhailah Isnin, Muhammad Asri Akmal bin Haji Suhip, Rahayu S. S. Sukri, Laure Gandois, Charles Harvey
Summary: Most peat domes in Southeast Asia have drainage canals that carry high concentrations of dissolved methane, which can potentially contribute to atmospheric methane emissions. This study used a numerical model to simulate methane transport, degassing, and oxidation along a drainage canal in Brunei Darussalam. The results showed that the majority of methane entering the canal is oxidized within the canal, a portion is released to the atmosphere, and a small fraction is transported towards the ocean. The methane emissions from the canal are significant compared to emissions from the peat surface and vegetation, but the canal is not the dominant source of methane in the peatland.
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
(2023)
Article
Biochemistry & Molecular Biology
Misato Ogasahara, Alexander R. Cobb, Rahayu Sukmaria Sukri, Faizah Metali, Koichi Kamiya
Summary: Southeast Asia's biodiversity is supported by a diverse range of forest types, with peat swamp forests having fluctuated greatly over the past 120,000 years. Genetic analysis of Shorea albida in Brunei revealed the species's high genetic diversity and distinct populations. These populations are believed to have diverged from an ancestral population around 7,500 years ago, during a period of high sea levels. The current genetic structure of S. albida is thought to be the result of small refugial populations surviving in higher-elevation areas. Brunei's S. albida populations are important genetic resources for the recovery of populations in other parts of northwest Borneo.
GENES & GENETIC SYSTEMS
(2023)
Article
Multidisciplinary Sciences
Chandra S. Deshmukh, Ari P. Susanto, Nardi Nardi, Nurholis Nurholis, Sofyan Kurnianto, Yogi Suardiwerianto, M. Hendrizal, Ade Rhinaldy, Reyzaldi E. Mahfiz, Ankur R. Desai, Susan E. Page, Alexander R. Cobb, Takashi Hirano, Frederic Guerin, Dominique Serca, Yves T. Prairie, Fahmuddin Agus, Dwi Astiani, Supiandi Sabiham, Chris D. Evans
Summary: This study measures the net ecosystem exchanges of carbon dioxide, methane, and soil nitrous oxide fluxes in a peatland in Sumatra, Indonesia. The results show that the greenhouse gas emissions from an Acacia plantation are lower than from a degraded site but higher than from an intact forest.
Article
Environmental Sciences
Alexander R. Cobb, Rene Dommain, Rahayu S. Sukri, Faizah Metali, Bodo Bookhagen, Charles F. Harvey, Hao Tang
Summary: Tropical peatlands hold significant carbon stocks in the form of peat, with peat domes being the main carbon storage structure. Measuring the subtle topographic relief of these peat domes is challenging, but spaceborne laser altimetry data from satellites like GEDI and ATLAS could provide valuable insights. The study evaluated the accuracy of these data in comparison to airborne lidar data, and found that with spatial filtering, the spaceborne platforms can provide useful altimetry data for tropical peatlands.
SCIENCE OF REMOTE SENSING
(2023)
Article
Environmental Sciences
Yusuf Jameel, Mason Stahl, Holly Michael, Benjamin C. Bostick, Michael S. Steckler, Peter Schlosser, Alexander van Geen, Charles Harvey
Summary: In this study, we investigated the source of groundwater recharge in the Bengal Basin using stable water isotope measurements. Through Monte Carlo statistical analysis, we found distributions of possible recharge sources by considering the variability of isotope ratios. Our results show that there has been a shift in groundwater recharge sources in recent decades, with an increase in recharge from stagnant surface water bodies and a decrease in direct infiltration of precipitation. This shift is attributed to an increase in standing water in irrigated rice fields and ponds, as well as an increase in the downward hydraulic gradient during the dry season driven by pumping.
COMMUNICATIONS EARTH & ENVIRONMENT
(2023)
Proceedings Paper
Automation & Control Systems
Jean-Baptiste Seby, Charles Harvey, Saurabh Amin
Summary: This article studies a game where agents interact over a network and engage in two coupled activities. The authors consider the general case where the network effects are heterogeneous across activities and derive a sufficient condition for the existence and uniqueness of a Nash equilibrium. They apply this game in the context of palm oil tree cultivation and timber harvesting.
2022 58TH ANNUAL ALLERTON CONFERENCE ON COMMUNICATION, CONTROL, AND COMPUTING (ALLERTON)
(2022)
Article
Environmental Sciences
Adi A. M. Addly, Alexander R. Cobb, Rahayu S. Sukri, Salwana M. Jaafar, Suhailah Isnin, Surin K. Thamilselvam, Stefan H. Godeke
Summary: Tropical peatlands in Southeast Asia are vital for carbon sequestration, but face the risk of carbon emissions due to fires. This study examined the residual ash method's applicability in tropical peatlands and found it unreliable for determining carbon loss.