A5103206617- Geotechnical Engineering and Soil Mechanics
- Hydrology and Sediment Transport Processes
- Soil erosion and sediment transport
- Hydrology and Watershed Management Studies
- Geotechnical Engineering and Underground Structures
- Geotechnical Engineering and Soil Stabilization
- Semiconductor Lasers and Optical Devices
- Geotechnical Engineering and Analysis
- Phase-change materials and chalcogenides
- Soil Geostatistics and Mapping
- Structural Health Monitoring Techniques
- Advanced Fluorescence Microscopy Techniques
- Probabilistic and Robust Engineering Design
- Geotechnical and construction materials studies
- Drilling and Well Engineering
- Soil and Water Nutrient Dynamics
- Force Microscopy Techniques and Applications
- Geophysical Methods and Applications
- Structural Integrity and Reliability Analysis
- Rangeland and Wildlife Management
- Grouting, Rheology, and Soil Mechanics
- Marine animal studies overview
- Photonic and Optical Devices
- Offshore Engineering and Technologies
- Geological formations and processes
The University of Western Australia
1997-2025
Teagasc - The Irish Agriculture and Food Development Authority
2022
Fugro (United Kingdom)
2018
Fugro (Norway)
2016
National Institute of Food and Agriculture
2010-2011
Natural Resources Conservation Service
2008
National Agricultural Library
2008
Utah State University
1991-1998
Graduate School USA
1998
University of California, Berkeley
1992-1995
The Conservation Effects Assessment Project (CEAP) was initiated by the USDA Natural Resources Service (NRCS), Agricultural Research (ARS), and Cooperative State Research, Education, Extension (CSREES) in response to a general call for better accountability of how society would benefit from 2002 farm bill's substantial increase conservation program funding (Mausbach Dedrick 2004). original goals CEAP were establish scientific understanding effects practices at watershed scale estimate...
Finite element analysis has been used to investigate the interaction between anchor flukes and undrained soil at failure. The behaviour of a rectangular wedge-shaped investigated when anchors are subject combined rotational translational loadings similar those experienced during dragging. results have presented in terms plasticity framework produce an associated plastic failure locus for loading conditions. It is seen that different shaped displacements because its asymmetrical shape, this...
This paper presents a new technique for objectively identifying pools and riffles. The is termed the bed form differencing as its data base has elevations surveyed at fixed interval along channel. These are differenced, difference or elevation change values used to identify Where cumulative since last exceeds certain tolerance value, considered exist, type of being determined by direction change. Analysis small stream in western New York suggests that most realistic pool‐riffle sequence...
For offshore structures like wind turbines, subsea infrastructure, pipelines, and cables, it is crucial to quantify the properties of seabed sediments at a proposed site. However, data collection costly, so analysis must be made from measurements that are spatially sparse. Adding this challenge, structure exhibits both nonstationarity anisotropy. To address these issues, we propose GeoWarp, hierarchical spatial statistical modeling framework for inferring 3-D geotechnical sediments. GeoWarp...
Abstract Successful long‐term wetland restoration efforts require consideration of hydrology and surrounding land use during the site selection process. This article describes an approach to initial in San Luis Rey River watershed southern California that uses watershed‐level information on basin topography cover rank potential suitability all sites within a for either preservation or restoration. requires geographic system (GIS) map relative wetness watershed. Relative values were derived...
We have constructed a scanning confocal laser-feedback microscope that determines surface profiles in the range of 5 nm to 3 μm with ~200-nm lateral discrimination. A direct comparison is made electron microscopy, and an image silicon resolution standard 40-nm-high structures shown. The device also capable characterizing motion sensitivity <1 pm (Hz)−1/2 across bandwidth several megahertz. Vibrational analysis miniature piezoelectric microphone demonstrated from 50 Hz kHz. An operational...
Abstract We present a conceptual model for identifying restoration sites riparian wetlands and discuss its application to reaches within the Upper Arkansas River basin in Colorado. The utilizes Geographic Information System (GIS) analyze variety of spatial data useful characterizing geomorphology, hydrology, vegetation wetland sites. focuses on three basic properties sites: relative soil moisture, disturbance regime, vegetative characteristics. A wetness index is used define nominal moisture...
Agriculture, in its broadest form, is the greatest consumptive user of water resources United States and around world. Perhaps challenge facing agricultural producers will be adapting management to an increasingly variable climate. Adaptation extremely difficult, part because other demands for (e.g., energy, domestic, industrial, municipal) continue increase. Despite considerable improvements irrigation technology, product development, water-saving approaches, expected reduce consumption...
Federally funded university water programs have had limited success in halting the degradation of resources agricultural, rural, and urbanizing watersheds for past five decades. USDA-funded advanced our understanding watershed processes development best management practices (BMPs; e.g., conservation tillage, nutrient management, alternative innovative septic systems, riparian buffers) to mitigate environmental risks from anthropogenic activities, particular agriculture, resources; yet...
Suction-embedded plate anchors (SEPLAs) utilise a suction caisson to install anchor positioned near the base of caisson. This eliminates much geotechnical uncertainty surrounding final position (relative drag anchors), whilst also providing significant economic benefit as is reused between installations, thereby saving on steel and transportation. These benefits have been realised in clay seabeds - but their use not proven silt/sand that are often prevalent shallow intermediate water depths,...
Abstract Slope frequency distributions are computed from Digital Elevation Models (DEMs) of 18 areas five different geographic and physiographic regions. Over 160,000 slope estimates used in the definition distribution for each area. Analysis several transformations data indicates that no single transformation is capable normalizing all distributions. This is, part, due to arbitrary placement boundaries map sheets collection. The square root sine, however, provides better results than...
The design of large offshore drag anchors remains relatively primitive, relying on charts that cover broad categories soil type, and with no direct link to specific shear strength profiles at a given site. Physical modeling offers one way improve the framework, drum centrifuge, offering essentially unlimited distance, has obvious advantages. This paper describes series scale model anchor tests performed in centrifuge University Western Australia (UWA) sample comprising normally consolidated...
Abstract Recently there has been significant interest in the development of seabed trenches associated with anchor chains front suction anchors. The issue was first highlighted by Bhattacharjee et al. (2014) relation to Serpentina FPSO located offshore Equatorial Guinea. subsequent implications experience have significant, such that geotechnical design anchors now often includes allowance for potential formation an chain trench extending down padeye. Previous publications relating (mooring...
Considerable attention has been devoted to shape analysis in geography with few fruitful results. We ask whether or not is worth pursuing, referring papers by Griffith and Lo. The methodology utilizes a two-step procedure. First, Lo's reconstructed include indices reported Griffith. Second, findings from the investigations are compared. Similar results obtained both studies, but failure extract any one-to-one correspondence between its associated index value(s) continues cast doubt on...
Due to the mechanical properties of seabed exhibiting horizontal and vertical spatial variability, an important challenge in offshore geotechnical design lies selection relevant soil strength profile for foundation sizing, called hereafter "design line." Design values are most often selected depth-wise using existing field data, through knowledge volume distance data from designed infrastructure considering limit state targeted level reliability. The cone penetration test (CPT) is...
Abstract Successful long‐term wetland restoration efforts require consideration of hydrology and currounding land use during the site selection process. This article describes an approach to initial in San Luis Rey River watershed southern California that uses watershed‐level information on basin topography cover rank potential suitability all sites within a for either preservation restoration. requires geographic system (GIS)to map relative wetness watershed. Relative values were derived...
Meeting sustainable food production challenges requires efficient ways to manage nutrients and mitigate the losses of nitrogen (N) phosphorus (P) water. Future nutrient management therefore a clearer understanding relative influence soils, geology, farm practice, landscape weather on propensity for be lost Within Agricultural Catchments Programme (ACP), environmental, agronomic socioeconomic data have been gathered since 2009, using same experimental methodology in five meso-scale river...
Acoustic-to-seismic coupling-based technology using a multi-beam laser Doppler vibrometer (LDV) as vibration sensor has proved itself potential confirmatory for buried landmine detection. The LDV simultaneously measures the of ground at 16 points spread over 1-meter line. was used in two modes operation: stop-and-stare, and continuously scanning beams. noise floor measurements mode increased with increasing speed. This increase velocity is caused by dynamic speckles. influence amplitude...
Abstract Scour poses a significant risk to infrastructure placed on mobile seabeds. Seabed mobility is common the North West Shelf of Australia, in parts Sea, and also occurs deepwater Gulf Mexico, due loop currents. can undermine structures and, for shallow-skirted mudmat foundations, there be consequences including excessive settlements, tilt loss bearing sliding capacity. However, scour mitigation via engineered protection costly, avoided if possible. This paper describes new quantitative...
Interpreting seabed properties for future offshore wind farm development appears challenging given the requirement to investigate very large areas. Current approaches, where significant numbers of geotechnical boreholes and cone penetration tests (CPTs) are conducted—often at location each foundation or anchor—may prove prohibitive scale modern farms (typically over 100 turbines). This paper presents a framework refinement design piles under axial tension [for example, anchor floating...