Application of Laser Particle Analyzer on Suspended Particle Distribution during River-Sea Water Mixing
Date Issued
2015
Date
2015
Author(s)
Lee, Lu
Abstract
In nature water, transfer and transformations of suspended particles were controlled by chemical and physical processes such as flocculation, adsorption and desorption. Most suspended particles in the estuarine and coastal environments are in the form of flocs because of flocculation processes. Many of these flocs might be break up easily during sampling and filtering analysis, which cause the estimation error of suspended sediment concentration (SSC). In this work, series of laboratory and field experiments using LISST-100X in-situ particle size analyzer and sized fractionate filtration method (CATNET: 0.4μm~10μm, 10~63μm, 63~153μm, >153μm) to monitor the distributions and changes of suspended particles during tidal mixing. Laboratory experiment shows that the artificial particle (chelex-100) moved to smaller particle size under high salinity condition. And for field experiments in Danshui river, the measured volume concentration by LISST-100X of larger particles increased during flood tide, but samples of large size particles collected by vacuum filtration and CATNET shows a inverse results. This phenomenon confirms that, flocs and aggregates were fragile, the traditional vacuum filtration of sampling cause the breakage of flocs and leads to the wrongful estimation of particle size distribution and variation.
Subjects
flocculation
suspended particles
Danshui river
Type
thesis
File(s)![Thumbnail Image]()
Loading...
Name
ntu-104-R00241313-1.pdf
Size
23.54 KB
Format
Adobe PDF
Checksum
(MD5):c0d76dc26c4fcdabf9efe6a6ff77d8ab