Article
Environmental Sciences
N. Masaoka, K. Kosugi, M. Fujimoto
Summary: This study determined the catchment area of bedrock groundwater (BGW) and found its significant influence on surface runoff characteristics. By measuring the BGW catchment area, it provided a more accurate prediction of actual catchment effect and baseflow volume for the watershed.
WATER RESOURCES RESEARCH
(2021)
Article
Water Resources
Chen-Wei Chiu, Takashi Gomi, Marino Hiraoka, Katsushige Shiraki, Yuichi Onda, Bui Xuan Dung
Summary: This study examined the effects of 50% strip thinning on catchment-scale annual and seasonal evapotranspiration using runoff data. The results showed that evapotranspiration increased after thinning, with compatible seasonal patterns. The STWB model used in this study can evaluate the impact of timber harvesting on evapotranspiration changes.
HYDROLOGICAL PROCESSES
(2022)
Article
Water Resources
Braulio Lahuatte, Giovanny M. Mosquera, Sebastian Paez-Bimos, Marlon Calispa, Veerle Vanacker, Xavier Zapata-Rios, Teresa Munoz, Patricio Crespo
Summary: This study investigates the stable isotopic composition of precipitation, soil water, wetlands, and streamflow to understand the hydrology of a tropical Andean catchment with deep and permeable volcanic soils. The findings show that subsurface flow paths are the main contributors to streamflow generation.
HYDROLOGICAL PROCESSES
(2022)
Article
Environmental Sciences
Magda Stella de Melo Martins, Carlos Alberto Valera, Marcelo Zanata, Regina Maria Bessa Santos, Vera Lucia Abdala, Fernando Antonio Leal Pacheco, Luis Filipe Sanches Fernandes, Teresa Cristina Tarle Pissarra
Summary: This study investigated the relationships between land use and future land change scenarios on water resources in an environmental protection area using the SWAT hydrological model. Results showed significant impacts of future changes on rainfall distribution and hydrological processes.
Article
Environmental Sciences
Dymphie J. Burger, Johnny Vogel, Annemieke M. Kooijman, Roland Bol, Eva de Rijke, Jorien Schoorl, Andreas Luecke, Nina Gottselig
Summary: Climate change affects nutrient exports in catchment stream water through high-discharge events. Colloidal exports of N, S, and P vary between late winter and spring. Phosphorus is mainly transported by colloids in spring, while nitrogen and sulfur are predominantly dissolved during both seasons.
VADOSE ZONE JOURNAL
(2021)
Article
Environmental Sciences
F. Clayer, J. -e. Thrane, U. Brandt, P. Dorsch, H. A. de Wit
Summary: The study reveals that boreal headwaters and aquatic sediments play a significant role in the transport and emission of terrestrial carbon, impacting atmospheric CO2 and land carbon sink through processes like microbial metabolism and seasonal fluctuations. Results show that TOC mineralization in headwater lakes is the main loss of TOC along the aquatic continuum, emphasizing the importance of headwaters as intensive and fast-responding TOC processors.
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
(2021)
Article
Engineering, Civil
Yuko Asano, Satoshi N. Suzuki, Masatoshi Kawasaki
Summary: The study found that in high-relief mountain catchments, peak unit discharge and unit direct runoff increase with catchment area. Spatial variations in storm rainfall have little effect on the differences in flood flow among catchments.
JOURNAL OF HYDROLOGY
(2022)
Article
Engineering, Civil
Daniel S. Moreno Martin, Philippe Ackerer, Frederick Delay, Daniel Viville, Philippe Negrel, Francois Chabaux
Summary: This study evaluates the hydrological information obtained from spring water temperature variations in shallow and thin aquifers of headwater catchments through analysis and interpretation of temperature data from 2013 to 2017 at the Strengbach Critical Zone Observatory (CZO). The results show that heat transfer in the shallow subsurface is mainly controlled by thermal conduction rather than fluid flow. The study suggests that spring water temperature variations could be used to identify saturated water content and its spatial variability at the catchment scale.
JOURNAL OF HYDROLOGY
(2023)
Article
Engineering, Civil
D. T. Mahoney, J. R. Christensen, H. E. Golden, C. R. Lane, G. R. Evenson, E. White, K. M. Fritz, E. D'Amico, C. D. Barton, T. N. Williamson, K. L. Sena, C. T. Agouridis
Summary: This study expanded the understanding of streamflow permanence in headwater systems by developing a process-based, catchment-scale hydrologic model that identified the controls of streamflow expansion and contraction in a headwater network. The model simulated that streamflow permanence was highly dynamic in first-order reaches, with the simulated stream network length ranging from nearly 98% ± 2% of the geomorphic channel extent during wet periods to nearly 50% ± 10% during dry periods. The study also revealed a discharge threshold above which the rate of streamflow expansion decreased significantly during high-flow periods.
JOURNAL OF HYDROLOGY
(2023)
Article
Water Resources
Tomohiro Egusa, Tomo'omi Kumagai, Tomoki Oda, Nobuhito Ohte
Summary: The study found that bedrock groundwater discharge significantly affects the concentrations of stream dissolved organic carbon and dissolved inorganic phosphorous, but has little impact on dissolved inorganic nitrogen.
HYDROLOGICAL PROCESSES
(2021)
Article
Multidisciplinary Sciences
Qun Miao, Xuefei Li, Youqin Xu, Chao Liu, Ruikang Xie, Zhihan Lv
Summary: This paper investigates the groundwater quality and chemical characteristics of a coastal city, finding significant variations in groundwater quality between the northern inland area and the southern coastal area, influenced by different factors.
Article
Geosciences, Multidisciplinary
Jana Erdbrugger, Ilja van Meerveld, Jan Seibert, Kevin Bishop
Summary: Shallow groundwater plays a crucial role in streamflow and hydrological models, but high-resolution datasets on groundwater levels are limited. To better understand groundwater dynamics, we installed a network of wells in the Krycklan catchment in Sweden, recording groundwater-level variations at frequent intervals. The dataset includes water-level measurements, groundwater chemistry analysis, and precise measurements of well locations, providing valuable information for testing groundwater models and evaluating hydrological connectivity.
EARTH SYSTEM SCIENCE DATA
(2023)
Article
Ecology
Nele Lehmann, Hugues Lantuit, Michael Ernst Boettcher, Jens Hartmann, Antje Eulenburg, Helmuth Thomas
Summary: The weathering rate of carbonate minerals is much higher than for silicate minerals, and small amounts of carbonate minerals can control dissolved weathering loads in silicate-dominated catchments. Misattribution of weathering sources can lead to incorrect conclusions about CO2 fixation. This study aimed to identify weathering sources and their impact on CO2 fixation in a degrading permafrost landscape in northern Norway.
Article
Engineering, Civil
Ayumi Sugiyama, Maki Tsujimura, Yuichi Onda, Koichi Sakakibara, Kosuke Nagano, Shinjiro Yano, Kazuyo Nagaosa, Kenji Kato
Summary: In this study, the spatiotemporal distribution of prokaryotic communities in groundwater and spring water was investigated to examine the relationship between the groundwater flow system and prokaryotic dynamics. The results showed that as the residence time of groundwater increased, the density of prokaryotes in the shallow subsurface also increased, whereas that of the prokaryotes in the deep subsurface decreased.
JOURNAL OF HYDROLOGY
(2023)
Article
Engineering, Civil
Michael R. Williams, Solange Filoso
Summary: Implementing RSC design for stream restoration can increase groundwater recharge and the proportion of base flow in total runoff, leading to significant reductions in nutrient and sediment loads.
JOURNAL OF HYDROLOGY
(2023)
Article
Water Resources
Shin'ya Katsura, Ken'ichirou Kosugi, Takahisa Mizuyama
HYDROLOGICAL PROCESSES
(2008)
Article
Engineering, Civil
Shin'ya Katsura, Ken'ichirou Kosugi, Yosuke Yamakawa, Takahisa Mizuyama
JOURNAL OF HYDROLOGY
(2014)
Article
Environmental Sciences
Shin'ya Katsura, Ken'ichirou Kosugi, Tasuku Mizutani, Takahisa Mizuyama
VADOSE ZONE JOURNAL
(2009)
Article
Environmental Sciences
Yosuke Yamakawa, Ken'ichirou Kosugi, Shin'ya Katsura, Naoya Masaoka, Takahisa Mizuyama
VADOSE ZONE JOURNAL
(2012)
Article
Environmental Sciences
Shin'ya Katsura, Ken'ichirou Kosugi, Tasuku Mizutani, Suemi Okunaka, Takahisa Mizuyama
WATER RESOURCES RESEARCH
(2008)
Article
Environmental Sciences
Ken'ichirou Kosugi, Shin'ya Katsura, Takahisa Mizuyama, Suemi Okunaka, Tasuku Mizutani
WATER RESOURCES RESEARCH
(2008)
Article
Engineering, Geological
Nobutomo Osanai, Takashi Yamada, Shin-ichiro Hayashi, Shinya Kastura, Takahisa Furuichi, Seiji Yanai, Yasuhiro Murakami, Tomoyoshi Miyazaki, Yuichiro Tanioka, Shigetaka Takiguchi, Mayumi Miyazaki
Article
Engineering, Geological
Toshiya Aoki, Shin'ya Katsura, Takashi Koi, Yasutaka Tanaka, Takashi Yamada
Summary: The 2018 Hokkaido Eastern Iburi Earthquake triggered numerous shallow landslides, with higher occurrence on concave slopes, indicating the role of water in initiating the landslides. Water plays two important roles in co-seismic landslides: formation of vulnerable pyroclastic-fall-deposit layer due to persistent weathering, and saturation of depths around landslide slip surface before earthquakes.
Article
Geosciences, Multidisciplinary
Takashi Koi, Norifumi Hotta, Yasutaka Tanaka, Shin'ya Katsura
Summary: This study evaluates the risk of future large woody debris (LWD) disasters caused by earthquakes based on the sequence of LWD generation, its spatial distribution, and LWD relocation linked to rainfall events. The study found that a large amount of LWD entered the river channel and formed logjams during landslides, but the movement of LWD decreased in the two years after the earthquake. The study highlights the importance of considering the distribution of LWD and the formation of logjams when planning future actions.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Environmental Sciences
Takahiko Yoshino, Shin'ya Katsura
Summary: The formation of a semi-perennial to perennial groundwater zone in a hollow of a serpentine headwater catchment is observed, which is caused by the differences in hydraulic properties between organic soil layers and clay mineral soil layers.
Article
Geosciences, Multidisciplinary
Shin'ya Katsura, Yoko Tomita, Nobutomo Osanai, Chiaki Inaba, Masashi Arai, Osamu Saguchi
JOURNAL OF DISASTER RESEARCH
(2010)
Article
Environmental Sciences
K Kosugi, S Katsura, M Katsuyama, T Mizuyama
WATER RESOURCES RESEARCH
(2006)
Article
Environmental Sciences
S Katsura, K Kosugi, N Yamamoto, T Mizuyama
VADOSE ZONE JOURNAL
(2006)