Article
Ecology
Masaru Sakai
Summary: Deer overpopulation globally leads to increased soil runoff into streams, resulting in higher levels of suspended sediment and fine sedimentation. While the effect of deer-induced fine sedimentation on macroinvertebrate communities in depositional habitats is known, the impact of drifting suspended sediment in erosional habitats remains unclear. This study compared habitat and macroinvertebrate community structures in first-to third-order streams between deer-excluded and grazed catchments in a Japanese headwater system. The results showed that fine sediment cover on the streambed was significantly higher in grazed catchments for first-order streams, while macroinvertebrate community structure differed between the deer-excluded and grazed catchments across all stream orders. These findings highlight the importance of hydro-geomorphological processes in assessing the restoration of forest-stream ecosystems, particularly in dynamic headwater systems.
ECOLOGICAL ENGINEERING
(2023)
Article
Environmental Sciences
Thomas Grangeon, Rosalie Vandromme, Olivier Cerdan, Maria De Girolamo Anna, Antonio Lo Porto
Summary: Forests provide ecological and hydrological services, but forest fires can have negative impacts, requiring appropriate mitigation strategies. A study used a model to analyze the effects of forest fires and firebreaks on sediment loads. More research is needed to understand the global impacts of forest growth, fires, and firebreaks on sediment transfers in similar environments.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2021)
Article
Environmental Sciences
Yu Fu, Dichen Wang, Wenping Sun, Mingming Guo
Summary: This study investigated the effects of planting density and its components (aboveground parts and roots) on slope runoff and soil erosion mechanisms. The results showed that grass significantly reduced the runoff rate, velocity, shear stress, stream power, and soil loss rate. The aboveground parts mainly contributed to the reduction in runoff rate and velocity, while the grass roots mainly contributed to the reduction in Reynolds number, shear stress, stream power, and soil loss rate. The findings of this study provide a scientific reference for vegetation restoration strategies.
LAND DEGRADATION & DEVELOPMENT
(2023)
Article
Engineering, Civil
Claudia Alessandra Peixoto de Barros, Gerard Govers, Jean Paolo Gomes Minella, Rafael Ramon
Summary: This study aimed to assess the hydrological and erosive process dynamics in the catchment, revealing that 62% of the hydrograph is formed by groundwater + soil water, especially in autumn-winter and for low-medium magnitude events, with a dilution effect observed during rainfall events on dissolved silicon (DSi) concentration and suspended sediment concentration. The performance of physics-based models in a catchment with very fragile soils and frequent changes in land use is impacted by runoff separation.
JOURNAL OF HYDROLOGY
(2021)
Article
Geosciences, Multidisciplinary
Okan Aygun, Christophe Kinnard, Stephane Campeau
Summary: This study examines the potential impacts of climate change on soil erosion in an agricultural catchment in eastern Canada. The Modified Universal Soil Loss Equation (MUSLE) and a hydrological model were used to calculate sediment yields and assess climate sensitivity. Results suggest that conservation and no-till practices could significantly reduce annual sediment yields.
Article
Geosciences, Multidisciplinary
Mingguo Zheng, Yishan Liao, Chen Liang, Bin Huang, Zaijian Yuan
Summary: This study conducted experiments on the Chinese Loess Plateau and found that erosion-induced network of rills and gullies increased flow connectivity, resulting in uniform runoff from the upper hillslope to the headwater outlet. The results suggest that scale-independent runoff is typical of highly degraded slope systems.
Article
Geosciences, Multidisciplinary
Thomas Grangeon, Valeria Ceriani, Olivier Evrard, Aurelie Grison, Rosalie Vandromme, Arthur Gaillot, Olivier Cerdan, Sebastien Salvador-Blanes
Summary: This study quantified water and sediment transfers in a tile drained catchment of central France and found high seasonal variability and two transfer pathways in the soil column during 36 recorded flood events.
Article
Agriculture, Multidisciplinary
Lanlan Du, Yaxian Hu, Xin Gao, Weijia Li, Rui Wang, Fangbin Hou, Shengli Guo
Summary: This study investigates the variations in soil CO2 emissions in erosion-deposition plots on China's Loess Plateau and finds that runoff and sediment play an important role in soil erosion and deposition. The results show significant differences in CO2 emissions between eroding slopes and depositional zones, with lower CO2 emissions in the erosion-deposition plots. Furthermore, soil organic carbon mineralization is sensitive to displaced runoff and sediment.
AGRICULTURE ECOSYSTEMS & ENVIRONMENT
(2022)
Article
Environmental Sciences
Giuseppe Bombino, Giuseppe Barbaro, Pedro Perez-Cutillas, Daniela D'Agostino, Pietro Denisi, Giandomenico Foti, Santo Marcello Zimbone
Summary: The implementation of ecologically-sound remediation measures is crucial in Mediterranean forest environments for the prompt stabilisation of burned areas. This study conducted a plot-scale runoff/sediment yield survey in a Mediterranean pine forest affected by a wildfire in Italy, and found that manual redirection of burned felled logs helped control soil erosion and promote forest self-regeneration. The results showed that the manual redirection of burned logs mitigated the degradation effect by approximately 30% and promoted early vegetation regeneration.
Article
Environmental Sciences
Chong Yao, Qingwei Zhang, Chenfeng Wang, Jie Ren, Haike Li, Hao Wang, Faqi Wu
Summary: The study aimed to investigate the variations of sediment transport capacity by overland flow (Tc) with respect to soil properties and establish a universal relationship for predicting Tc. The results showed that Tc significantly decreased with clay content, mean weight diameter, and soil organic matter content. Tc for different soil types increased with slope gradient and flow discharge, with slope gradient having a greater impact. Stream power was found to be the most appropriate hydraulic variable for expressing Tc. A quaternary power function or a ternary power function could satisfactorily simulate Tc for different soil types.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Multidisciplinary Sciences
Kai Zhang, Wang Xuan, Bai Yikui, Xu Xiuquan
Summary: The study introduces two new formulae for sediment transport capacity (T-c) on brown soil slopes and slopes with vegetation. It evaluates the impact of slope gradient and flow discharge on sediment transport capacity of different slope types. Results show that vegetation slopes have a higher sediment transport capacity than brown soil slopes under the same discharge and slope gradient conditions. The sensitivity of sediment transport capacity to flow discharge is higher on brown soil slopes, while the sensitivity to slope gradient is higher on vegetation slopes.
Article
Geosciences, Multidisciplinary
Joaquim Farguell, Xavier Ubeda, Edinson Pacheco
Summary: The removal of shrubs in the Gavarres massif in NE Spain has caused significant changes in runoff and sediment transport rates, leading to increased runoff and sediment yield. This impact is mainly due to the exposure of soil caused by the removal of the shrub layer.
Article
Geosciences, Multidisciplinary
Sergey Chalov, Viktor Ivanov
Summary: This paper presents a comparative study of sediment budgets for the largest Siberian rivers in Northern Eurasia. The data suggests that sediment sinks and storage in catchment and river networks dominate the sediment budget, leading to a significant decline in sediment transport compared to catchment erosion.
Article
Geosciences, Multidisciplinary
Mirian Lago Valente, Jose Miguel Reichert, Rosane Barbosa Lopes Cavalcante, Jean Paolo Gomes Minella, Olivier Evrard, Raghavan Srinivasan
Summary: The study shows that afforestation of degraded grasslands in subtropical headwater catchments leads to lower surface runoff and sediment yield compared to grasslands, with staggered forest harvesting helping further reduce sediment yield. Well-managed forest plantations are less prone to sedimentation than degraded grasslands under intensive grazing.
Article
Environmental Sciences
Artemi Cerda, Manuel Esteban Lucas-Borja, Ivan Franch-Pardo, Xavier Ubeda, Agata Novara, Manuel Lopez-Vicente, Zorica Popovic, Manuel Pulido
Summary: The research conducted in Sierra de Enguera in Spain for five years revealed that oak and lentisk were particularly efficient in controlling soil and water losses.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Zul Hilmi F. Saidin, Delphis F. Levia, Hiroaki Kato, Momo E. Kurihara, Janice E. Hudson, Kazuki Nanko, Yuichi Onda
Summary: This study examined the vertical variation of radiocesium flux from branchflow and stemflow through the canopies of young Japanese cedar and Japanese oak trees after the Fukushima nuclear accident. The results showed that the oak canopy had higher concentrations and depositional fluxes of Cs-137 compared to the cedar canopy. These findings provide important data for understanding radiocesium cycling in forests.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Yasunori Igarashi, Kenji Nanba, Toshihiro Wada, Yoshifumi Wakiyama, Yuichi Onda, Shota Moritaka, Alexei Konoplev
Summary: The 2011 Fukushima Daiichi Nuclear Power Plant accident led to the release of a large amount of radioactive materials into the environment. This study examined the seasonal fluctuations of dissolved and particulate Cs-137 activity concentrations in the middle course of the Abukuma River, and identified the factors controlling Cs-137 seasonality. The results showed seasonal variations in dissolved Cs-137 concentration, with an increase in summer and a decrease in winter, primarily influenced by water temperature and K+ concentration.
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
(2022)
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
Environmental Sciences
Yusuke Uchiyama, Natsuki Tokunaga, Kohei Aduma, Yuki Kamidaira, Daisuke Tsumune, Toshiki Iwasaki, Masatoshi Yamada, Yutaka Tadeda, Takashi Ishimaru, Yukari Ito, Yutaka W. Watanabe, Ken Ikehara, Miho Fukuda, Yuichi Onda
Summary: Significant release of radionuclides from the Fukushima Nuclear Power Plant resulted in their deposition on land and subsequent transport to the coastal areas, leading to long-term impacts on the marine environment.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Junko Takahashi, Daichi Hihara, Takuya Sasaki, Yuichi Onda
Summary: The study investigates the impact of rainfall infiltration on Cs-137 and finds that it can explain a small part of Cs-137's downward migration, but further research is needed to clarify the contribution of other mechanisms.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Hiroaki Kato, Yuichi Onda, Keita Maejima
Summary: This study examined the distribution of radiocesium from the Fukushima Daiichi Nuclear Power Plant accident in a densely planted Japanese cedar stand. The results showed that the Cs-137 inventories were heterogeneously distributed and had weak correlation between the deposited organic material and mineral soil. The controlling mechanisms of Cs-137 inventories differed in different layers. Additionally, the Cs-137 inventory in the soil increased with distance from the nearest tree trunk.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Green & Sustainable Science & Technology
Bin Feng, Yuichi Onda, Yoshifumi Wakiyama, Keisuke Taniguchi, Asahi Hashimoto, Yupan Zhang
Summary: Mechanical soil decontamination is an important tool in remediating contaminated soils. The study found that upstream decontamination caused persistently excessive suspended sediment loads downstream, but rapid vegetation recovery can shorten the duration of such unsustainable impacts. Future upstream remediation should consider pre-assessing local natural restoration and preparing appropriate revegetation measures in remediated regions for downstream sustainability.
NATURE SUSTAINABILITY
(2022)
Article
Engineering, Environmental
Donovan Anderson, Hiroaki Kato, Yuichi Onda
Summary: This study assessed the impact of precipitation on the deposition of 137Cs in forests after the Fukushima accident. The results showed that in areas where wet deposition processes were dominant, dense forests had lower ambient dose rates and contamination levels. Furthermore, 137Cs was retained in forest canopies for an extended period regardless of the deposition mode.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Environmental Sciences
Hiroyuki Arai, Takehiko Fukushima, Yuichi Onda
Summary: This study analyzed the changes and migration of radiocesium concentrations in sediments and suspended solids in Lake Kasumigaura following the Fukushima nuclear accident in 2011. The results showed that the radiocesium concentration decreased due to riverine input and atmospheric deposition, but remained relatively high. Furthermore, the difference in input between different rivers into the lake is gradually decreasing.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Correction
Green & Sustainable Science & Technology
Bin Feng, Yuichi Onda, Yoshifumi Wakiyama, Keisuke Taniguchi, Asahi Hashimoto, Yupan Zhang
NATURE SUSTAINABILITY
(2023)
Article
Environmental Sciences
Hikaru Sato, Maksym Gusyev, Dmytro Veremenko, Gennady Laptev, Naoaki Shibasaki, Yuichi Onda, Mark Zheleznyak, Serhii Kirieiev, Kenji Nanba
Summary: This study investigated the impact of water level drawdown in the cooling pond near the Chornobyl Nuclear Power Plant on the groundwater system. The results showed that the decrease in water levels led to a significant increase in 90Sr concentration at certain locations and affected the groundwater flow direction and velocity. Therefore, further monitoring is needed to verify the transport of 90Sr from areas of elevated concentrations and its impact on the aquifer.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Environmental Sciences
Isabela Silveira Baptista, Maki Tsujimura, Yuichi Onda
Summary: In this study, a new methodology utilizing stable isotopic concentrations and SF6 concentrations was applied to investigate temporal variations in the mean transit time of spring water in a forested headwater catchment in Japan. The results indicate that the mean transit time of spring water changed after forest thinning, suggesting long-term changes in hydrological processes.
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
Multidisciplinary Sciences
Bin Feng, Yuichi Onda, Yoshifumi Wakiyama, Keisuke Taniguchi, Asahi Hashimoto, Yupan Zhang
Summary: After the Fukushima nuclear accident, the Japanese government conducted extensive decontamination work in contaminated catchments. However, the impact of land use changes on river sediment discharge remained unknown. This study utilized a 6-year database to directly link the dynamics of river suspended sediment to land use changes caused by humans, providing fundamental data for understanding the response of river sediment to land use change.
Article
Forestry
Yupan Zhang, Yiliu Tan, Yuichi Onda, Asahi Hashimoto, Takashi Gomi, Chenwei Chiu, Shodai Inokoshi
Summary: This paper describes an innovative tree detection method using drone LiDAR data from a new perspective of the under-canopy structure. The method relies on trunk point clouds, with under-canopy sections split into heights ranging from 1 to 7 m, which were processed and compared to determine a suitable height threshold to detect trees. The results show that this trunk-section-based method significantly reduces the difficulty of tree detection in dense plantation forests with high accuracy (F1-Score = 0.9395).
