Effects of seasonal variations on sediment-plume streaks from dredging operations
| Autor: | Van Sy Pham, Nam-Il Won, Jin Hwan Hwang, Youngsung Kim, Nam-Hoon Kim, Ho Kyung Ha, Jungho Im |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Satellite Imagery
Geologic Sediments 010504 meteorology & atmospheric sciences Mixed layer 0211 other engineering and technologies Mineralogy 02 engineering and technology Aquatic Science Oceanography 01 natural sciences Sink (geography) Dredging Republic of Korea Seawater Ships Seabed 021101 geological & geomatics engineering 0105 earth and related environmental sciences geography geography.geographical_feature_category Continental shelf Sediment Pollution Plume Hydrodynamics Seasons Geology |
| Zdroj: | Marine Pollution Bulletin. 129:26-34 |
| ISSN: | 0025-326X |
| DOI: | 10.1016/j.marpolbul.2018.02.014 |
| Popis: | When mixtures of aggregates and water dredged from the seabed are discharged at the surface into the adjacent water from a barge, coarse sediments sink immediately and fine sediments are suspended forming a plume. Recently, elongated plumes of fine sediment were observed by satellites near a dredging location on the continental shelf. Such plume streaks were longer in certain conditions with seasonality than expected or reported previously. Therefore, the present work studied the appearance of sediment plume with field measurements and numerical simulations and explains the seasonally varying restoring force and thicknesses of the surface mixed layer resulting from the vertical density distribution near the surface, along with mixing by hydrodynamic process. The resulting mixtures, after vertical restoring and mixing with the surroundings, determine the horizontal transport of suspended sediments. A numerical model successfully reproduced and explained the results from field measurements and satellite images along with the seasonal variations. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect