Science, March 2008,
Impact of Artificial Reservoir Water Impoundment on
Global Sea Level,
B. F. Chao,* Y. H. Wu, Y. S. Li, College of Earth Sciences,
National Central University, Chung-Li, Taiwan, ROC.
…in the news…
• New study shows that sea level has been
rising at a steady rate, and at a faster rate
than previously believed, when you take
into account the volume of water that is
tied up in other reservoirs.
• The total volume of liquid water (versus
ice) on Earth is increasing…
Status of measurement techniques for
coastal sediment transport
Thomas E. White, Coastal Engineering, 1998.
“The known methods for measuring coastal sediment transport in the field may be
described and categorized as
total traps, suspension traps, tracers, optics,
acoustics, impact, conductivity, and radiation
. There are different applicable
situations and reasons for using each of the methods… Different methods are
applicable to problems of different temporal and spatial scales, ranging from
fractions of a second to years and from millimeters to kilometers. Some methods
measure bedload, others suspension, and some total transport. Some devices
measure only sediment concentration or velocity and must be used in combination
with other methods to determine transport. Some measure only longshore
transport, some cross-shore, and others will measure either.
Despite the plethora
of available methods, it is still not possible to make detailed or accurate field
measurements of suspensions of mixed sizes, suspension very close to the
seabed, or bedload. For these situations,
older and cruder methods of traps
are still used. There does not appear to be a systematic plan and
program for correcting these measurement deficiencies.
in the Erlenbach
D. Rickenmann and
B. W. McArdell,
Earth Surface Processes
and Landforms, 2007
• Due by April 11