Transport and trapping of storm eroded fine sediment in fringing mangroves, Sawi Bay, Thailand

The field study site was the mangrove-fringed Sawi Bay in Thailand. At stations, a Seabird CTD equipped with an Analite nephelometer was used to obtain vertical profiles of temperature, salinity and optical backscatterance. Oceanographic moorings were deployed at sites T1-T4 and T6 during October 1998, April 1999 and November 1999. A mooring included an InterOcean model S4 current meter or a Woods Hole WHISL 2100 current meter, a Dataflow temperature-salinity recorder, and Analite nephelometers spread across the water column. A wave gage was also deployed at site T1, this was either an InterOcean model S4 current meter or a Rigo wave gage. Mooring T1 also comprised an Aanderaa model WLR5 tide gauge. All these units recorded 1-min averaged data at 10 min intervals. The nephelometers’ backscatterance data were converted to suspended matter concentration following the technique of Gibbs and Wolanski (1992) and Wolanski et al. (1995).Transects of temperature, salinity and suspended sediment concentration were collected, both along-channel in the small tributaries draining into Sawi Bay and cross-shore in Sawi Bay, using a Seabird CTD equipped with an Analite nephelometer. A current meter, a tide gauge and 3 temperature and pressure recorders were attached to the Karmt 100 mooring for the first deployment. The tide gauge was replaced by a temperature and pressure recorder for the second deployment. Wind data were taken during field work using a hand held anemometer. The local bureau of meteorology office also provided long-term statistical data on winds for years prior to study.Measurements in wave height, water depth, currents, salinity and suspended solids concentration were used to study typical circulation in Sawi Bay and the adjoining coastal waters of the Gulf of Thailand.

本研究的野外调查区域为泰国红树林环绕的萨威湾（Sawi Bay）。在各调查站位，搭载Analite nephelometer（浊度计）的Seabird CTD（温盐深仪）被用于获取温度、盐度与光学后向散射的垂直剖面数据。1998年10月、1999年4月及1999年11月期间，研究人员在T1-T4与T6站位部署了海洋学锚系观测系统。每套锚系系统搭载InterOcean S4型海流计或Woods Hole WHISL 2100型海流计、Dataflow温盐记录仪，以及布放于整个水柱中的Analite nephelometer（浊度计）。站位T1同时部署了测波设备，其型号可选为InterOcean S4型海流计或Rigo测波仪；锚系T1另配备了Aanderaa WLR5型潮位计。所有观测设备均以10分钟为采样间隔，记录1分钟平均数据。研究人员依据Gibbs与Wolanski（1992）及Wolanski等（1995）提出的方法，将浊度计获取的后向散射数据转换为悬浮物质浓度。研究人员采用搭载Analite nephelometer（浊度计）的Seabird CTD（温盐深仪），沿汇入萨威湾（Sawi Bay）的小型支流河道走向以及萨威湾的跨岸方向，采集了温度、盐度与悬浮沉积物浓度的断面数据。首次布放的Karmt 100型锚系系统搭载了海流计、潮位计及3台温压记录仪；第二次布放时，原潮位计被替换为温压记录仪。野外调查期间，研究人员采用手持式风速计获取风速数据，当地气象部门亦提供了本研究开展前多年的长期风速统计资料。本研究通过测量波高、水深、海流、盐度与悬浮固体浓度，探究了萨威湾（Sawi Bay）及毗邻的泰国湾近岸海域的典型环流特征。