494 CHAPTER 8. LABORATORY MEASUREMENT AND ANALYSIS
Another profiling instrument design uses the electrical conductance between two electrodes at the bottom of the staff to keep the probe a short
distance above the sand bed. This type of profiler will work only in water, whereas, the infrared probe will work both in water and out of water.
Ultrasonic and optical devices have also been developed for measuring bed
profiles.
8.2.9 Laboratory Photo-Documentation
Still photographs, movies, and video are essential for documenting laboratory experiments. For example, documentation of injection-type tracer
models is normally performed photographically because water clarity usually is excellent, and the sediment paths and deposition areas are readily
identifiable. Sequential photographs of a tracer injection illustrate sediment
migration in the vicinity of the coastal project being studied.
Photo-documentation can help explain instrument arrangements, special features of the experiment, relative scale and physical arrangement,
and relative size of the waves. Photographs and video can be used as qualitative tools for capturing certain flow phenomena, such as wave refraction
and diffraction, over the entire study area. And video can be used to
demonstrate the effectiveness of design alternatives to the study sponsor,
or to communicate experiment details with colleagues far away from the
experiment site.
Video cameras and monitors are frequently used to monitor remote portions of a physical model, and new developments in fiber optics permit
viewing beneath the water surface without causing too much flow disturbance.
While^aking photographs or shooting video of an experiment, always
try to keep a record of what is being documented so that the final product
can be labeled. And finally, be very careful about placing high-intensity
camera lights close to the glass side wall of a wave tank because the heat
differential caused by the light may be enough to break the glass9.
The voice of personal experience!
8.3 Wave Data Analysis
The experimental phase of a study is complete when the data collected
over the course of the experiment have been analyzed and converted into a
form suitable for its intended use. This does not necessarily mean that all
collected data must be analyzed. As is often the case, some data will be from
aborted or flawed experiments, and it would be pointless to analyze those
Another profiling instrument design uses the electrical conductance between two electrodes at the bottom of the staff to keep the probe a short
distance above the sand bed. This type of profiler will work only in water, whereas, the infrared probe will work both in water and out of water.
Ultrasonic and optical devices have also been developed for measuring bed
profiles.
8.2.9 Laboratory Photo-Documentation
Still photographs, movies, and video are essential for documenting laboratory experiments. For example, documentation of injection-type tracer
models is normally performed photographically because water clarity usually is excellent, and the sediment paths and deposition areas are readily
identifiable. Sequential photographs of a tracer injection illustrate sediment
migration in the vicinity of the coastal project being studied.
Photo-documentation can help explain instrument arrangements, special features of the experiment, relative scale and physical arrangement,
and relative size of the waves. Photographs and video can be used as qualitative tools for capturing certain flow phenomena, such as wave refraction
and diffraction, over the entire study area. And video can be used to
demonstrate the effectiveness of design alternatives to the study sponsor,
or to communicate experiment details with colleagues far away from the
experiment site.
Video cameras and monitors are frequently used to monitor remote portions of a physical model, and new developments in fiber optics permit
viewing beneath the water surface without causing too much flow disturbance.
While^aking photographs or shooting video of an experiment, always
try to keep a record of what is being documented so that the final product
can be labeled. And finally, be very careful about placing high-intensity
camera lights close to the glass side wall of a wave tank because the heat
differential caused by the light may be enough to break the glass9.
The voice of personal experience!
8.3 Wave Data Analysis
The experimental phase of a study is complete when the data collected
over the course of the experiment have been analyzed and converted into a
form suitable for its intended use. This does not necessarily mean that all
collected data must be analyzed. As is often the case, some data will be from
aborted or flawed experiments, and it would be pointless to analyze those