Key Points Velocity measurements are obtained with an ADCP in a regulated river Procedures to assess the motion and record length presented Use of law wall for flow natural rivers is discussed

[1] A methodology is presented to quantify the mean flow field in a natural river with boat-mounted acoustic Doppler current profiler (ADCP). Moving-vessel (MV) and fixed-vessel (FV) survey procedures are used complementary fashion provide an improved representation of three-dimensional velocity profiles along cross section. Mean determined FV measurements rotated stream-fitted orthogonal coordinate system. The orientation system established using MV measurements. demonstrated obtained at...

As a part of the settling and self-weight consolidation fine-grained materials, common but not widely recognized phenomenon randomly occurs, namely channeling or formation narrow vertical paths “channels.” Channel can have important effects on microstructure, consolidation, shear strength characteristics newly formed sediments. However, only few studies been performed channeling. The causes channel factors affecting it are still fully understood. This paper presents results an experimental...

This paper critically compares the use of laboratory tests against in situ combined with numerical seepage modeling to determine hydraulic conductivity natural soil deposits. Laboratory determination used constant head permeability and oedometer on undisturbed Shelby tube block samples. The auger hole method Guelph permeameter were performed field. Groundwater table elevations deposits different values predicted using finite element compared field measurements assess various test results....

Recycled concrete aggregate (RCA) has been used as replacement for virgin aggregates in road foundation, embankment, portland cement concrete, and hot-mix asphalt. The use of RCAs drainage systems (i.e., base/subbase layer French drain) not received much attention because the poor performance RCAs. Two major causes are (1) accumulation excess fines precipitated on geotextile (2) deposition calcite precipitation over time. To date, many studies have conducted This limited unavailable...

Transient seepage analysis using numerical methods is characterized by an increase in the required number of input parameters when compared with a steady-state analysis. Among these additional are those that represent unsaturated soil characteristics, and obtaining properties generally more difficult, requires special testing apparatus, takes longer than conventional tests, thus costs more. To obtain reliable transient results reasonable effort, this study demonstrates which critical...

This article analyzes two virtual 3D point-cloud models, generated via terrestrial light detection and ranging (T-LiDAR), to compare the relative inaccuracies in distances introduced by different georeferencing approaches. One is rapid (~30 seconds per ground point) commonly used practice, Real-Time, Kinematic (RTK) Global Navigation Satellite System (GNSS) approach, other a more accurate, but time consuming (4 hours point), Static GNSS scheme. The goal determine statistical length...

Improving substandard soils with stabilizing agents has proven to be more practical and economical in many cases than acquiring good quality soil. Although a number of options for the chemical stabilization have been successfully demonstrated engineering projects, chemicals utilized are not environmentally friendly can create secondary issues such as corrosion materials leaching into subsoil groundwater. Developing new that improve mechanical behavior problematic but only minimal...

The increasing number of extreme climate events has impacted the operation reservoirs, resulting in drastic changes flow releases from reservoirs. Consequently, downstream riverbanks have experienced more rapid and frequent river water surface elevation (WSE). These WSE affect pore pressures riverbanks, directly influencing slope stability. This study presents an analysis seepage stability for under influence steady-state, drawdown, peaking operations Roanoke Rapids Hydropower dam on lower...

With a structure's foundation and supporting ground generally being critical to its design construction, understanding how soil behaves under various stress drainage conditions is imperative. It well known that certain characteristics behaviors of soils with fines are highly dependent on water content liquid limit one the important index properties define such characteristics. However, conventional measurement techniques can be easily affected by proficiency operator, potentially leading...

This article investigates spatial discrepancies existing between two simple, close-range photogrammetry (CRP) models and a terrestrial light detection ranging (T-LiDAR) model. The latter is more accurate serves as benchmark. commonly modeled zone six-acre commercial property. All three were georeferenced in the same coordinate system before acquiring coordinates of 50 common points from each them. Two produced via CRP, employing Agisoft’s Metashape Professional software, one, benchmark...