A5000547607- Hydrology and Watershed Management Studies
- Aeolian processes and effects
- Fish Ecology and Management Studies
- Tree Root and Stability Studies
- Flood Risk Assessment and Management
- Soil erosion and sediment transport
- Fire effects on ecosystems
- Soil and Water Nutrient Dynamics
- Groundwater flow and contamination studies
- Species Distribution and Climate Change
- Groundwater and Watershed Analysis
- Remote Sensing and LiDAR Applications
- Hydrocarbon exploration and reservoir analysis
- Coastal wetland ecosystem dynamics
- Plant responses to water stress
- Cryospheric studies and observations
- Forest Ecology and Biodiversity Studies
- Forest Insect Ecology and Management
- Forest ecology and management
- Geology and Paleoclimatology Research
- Freshwater macroinvertebrate diversity and ecology
- Aquatic Ecosystems and Phytoplankton Dynamics
- Tropical and Extratropical Cyclones Research
- Karst Systems and Hydrogeology
- Soil and Environmental Studies
Forestry and Forest Products Research Institute
2022-2025
Hokkaido Research Organization
2014-2024
Forestry Research Institute
2018-2022
Kyoto University
2022
Tree windbreaks have multifunctional benefits including wind damage reduction, soil erosion control, and biodiversity conservation. The removal low adoption of tree due to agricultural expansion are issues in many regions despite their critical role improving sustainability. Farmers' landowners' recognition the cultivation environments is necessary preserve windbreaks. To visualize using remote sensing techniques, we focused on top-to-bottom height ridges, which created homogeneously...
Abstract Inter‐catchment groundwater flow (IGF) plays an essential role in streamflow generation and water quality forested headwaters. Multiple factors are thought to contribute IGF, including climate, topographical, geological factors. However, studies have not clarified the relationships between IGF catchment properties headwater catchments due lack of observational data at scales smaller than 100 ha. This study examined possible influencing using random forest analysis based on annual...
Abstract Identifying climate‐change refugia is a key adaptation strategy for reducing global warming impacts. Knowledge of the effects underlying geology on thermal regime along climate gradients and ecological responses to geology‐controlled essential plan appropriate strategies. In present study, dominance volcanic rocks in watershed used as landscape‐scale surrogate cold groundwater inputs clarify importance stream ecosystems gradients. First, using hundreds monitoring stations...
Abstract We examined the contributions of bedrock groundwater to upscaling storm‐runoff generation processes in weathered granitic headwater catchments by conducting detailed hydrochemical observations five that ranged from zero second order. End‐member mixing analysis (EMMA) was performed identify geographical sources stream water. Throughfall, hillslope groundwater, shallow and deep were identified as end members. The contribution each member storm runoff differed among because differing...
Soil erosion on agricultural land causes severe environmental problems and damages crop plants. Structure-from-motion with multiview stereo (SfM-MVS) together data obtained via unmanned aerial vehicles (UAVs) helps understand spatiotemporal changes in the ground surface if there is enough precise data. However, installing control points field labor intensive disturbs conditions. Here, images georeferenced using Real-Time Kinematic (RTK) method were further improved Post-Processing (PPK)...
Abstract We examined how and why dominant peak‐flow runoff‐generation mechanisms differ among neighbouring headwater catchments. monitored runoff groundwater levels performed terrain analyses in a granitic second‐order catchment its four subcatchments the Kiryu Experimental Watershed Japan. Our analysis of lag times from peak rainfall to suggests differences five For two three zero‐order catchments, with few perennial bodies, subsurface flow hillslopes was mechanism at some events. However,...
Abstract The scaling relationships of groundwater contributions have been examined in previous studies, but whether these findings are site‐specific or applicable to other watersheds remains unclear. Here, we illustrate how differ between with different geology. We investigated the spatial distributions specific discharge (discharge per unit drainage area) and chemical compositions stream spring water during baseflow periods three Cretaceous Eocene sedimentary Neogene volcanic Ishikari River...
Abstract Groundwater discharge along channels can affect stream discharge, chemistry, and ecological communities. Although the spatial distribution of groundwater springs wide rivers be investigated by areal thermal infrared (TIR) remote sensing, this technique is difficult to apply mapping at a high resolution under riparian tree canopies. We present real‐time monitoring postprocessing method ground‐based TIR video for determining sampling points surface water temperature. applied two...
The development of a method to easily investigate the spatial distribution soil moisture and hardness in tree windbreaks is necessary because these often decline due inappropriate condition compaction. This research examined applicability ground-penetrating radar (GPR) combined penetrometer–moisture probe (CPMP) for evaluating four with different characteristics. A GPR-reflecting interface was observed at less permeable layer coastal windbreak depth affected by compaction an inland andosol....
Abstract Identifying climate-change refugia is a key adaptation strategy for reducing global warming impacts. Knowledge of the effects underlying geology on thermal regime along climate gradients and ecological responses to geology-controlled essential plan appropriate strategies. The dominance volcanic rocks in watershed used as landscape-scale surrogate cold groundwater inputs clarify importance geology. Using statistical models, we explored relationship between mean summer water...
We examined the effects of deep percolation on dissolved inorganic nitrogen (DIN) exports from two adjacent weathered granite headwater catchments with different percolations water in Kiryu Experimental Watershed (KEW), Japan. The DIN output streamflow was estimated a regression equation between stream discharge and load, determined both monthly sampling data event-based data. range by multiplying observed concentrations bedrock groundwater an annual budget analysis. found that corresponded...
A widespread decline of white birch (Betula platyphylla var. japonica) shelterbelts was observed in central Hokkaido, Japan. Many exit holes bored by white-spotted longicorn beetles (Anoplophora malasiaca) were found at the base trunks trees these stands. The present study aims to evaluate effects infestation on degradation, and demonstrates whether number (Nholes) can be used as an index trees. We selected 35 healthy appearing stands 16 degraded area. generalized linear mixed model with...
Abstract Widespread decline of white birch shelterbelts was observed in central Hokkaido, northern Japan. Many exit holes bored by adults the white-spotted longicorn beetle have been found at bases trunks trees these stands. The number adult ( N ) dead standing tended to be greater than that living trees. increase with increasing DBH , and there a negative relationship between tree vigor. We size-dependent lethal threshold . A resonance-measurement device (RMD) for diagnosing level wood...