Hydrographic and nutrient measurements in the vicinity of the Daintree River plume associated with Cyclone Sadie and other high rainfall events in 1994 (north Queensland)

Water was sampled at three stations located between Port Douglas and Undine Reef and at a single station on the leeward side of Agincourt Reef twice before Cyclone Sadie (January 11 and 18, 1994) and twice after Cyclone Sadie (February 1 and 3, 1994). Water samples were collected with a water bottle from the sea surface and near the bottom at each of these four stations. Salinity was immediately determined using a YSI conductivity meter. Duplicate 10 ml subsamples were collected from each bottle, filtered with disposable syringe filters and stored frozen for later analyses of nitrate and phosphate using a multichannel segmented flow autoanalyzer. Observations of the Daintree River plume were made following a further period of heavy rainfall, which occurred from the 18-20 February, 1994. A series of hydrographic measurements were conducted at eleven stations between Cape Tribulation and Port Douglas on February 21 and 22. At 4 stations close to the mouth of the Daintree River, water samples were collected from two to four different depths using Niskin bottles. Duplicate 10 ml subsamples were obtained, processed as described above, and analysed for dissolved inorganic and organic nitrogen. A 100 ml subsample was also obtained from each bottle, filtered onto a Whatman GF/F glass fibre filter, stored frozen and analysed for chlorophyll by fluorometry.
This research was undertaken to gain a greater understanding of the dispersion of flood plumes in the local/regional context.
As a result of Cyclone Sadie, between 250 and 400mm of rain fell in areas to the north of Cairns over the period January 29-31, 1994. Another period of heavy rainfall occurred from the 18-20 February, 1994. While this rainfall was less widespread and less intense than that associated with Cyclone Sadie, the Daintree area received about 170 mm of rain on February 18, 1994.

研究团队在道格拉斯港（Port Douglas）与安丁礁（Undine Reef）之间的3个海洋站位，以及阿金考特礁（Agincourt Reef）背风侧的1个站位开展水样采集：1994年1月11日、18日（赛迪气旋（Cyclone Sadie）过境前）各完成2次采样，1994年2月1日、3日（赛迪气旋过境后）各完成2次采样。上述4个站位的水样均采用采水器（water bottle）采集，采样层位涵盖海表及近底层。盐度采用YSI电导仪（YSI conductivity meter）现场即刻测定。每份采水器水样均采集两份平行10mL子样，经一次性针式过滤器过滤后冷冻保存，后续采用多通道分段流动式自动分析仪（multichannel segmented flow autoanalyzer）开展硝酸盐与磷酸盐含量分析。1994年2月18日至20日再次出现强降雨过程后，研究人员对丹特里河（Daintree River）羽状流进行了观测。

1994年2月21日至22日，研究团队在苦难角（Cape Tribulation）与道格拉斯港之间的11个站位开展了一系列海洋水文测量。在靠近丹特里河河口的4个站位，研究人员采用尼斯金采水器（Niskin bottles）采集了2至4个不同深度层的水样。同样采集两份平行10mL子样，按照前述方法处理后，分析溶解态无机氮与溶解态有机氮含量。每份采水器水样另采集100mL子样，经Whatman GF/F玻璃纤维滤膜过滤后冷冻保存，后续采用荧光光度法进行叶绿素含量分析。

本研究旨在深入阐明局地及区域尺度下洪水羽状流的扩散输运过程。

1994年1月29日至31日，受赛迪气旋影响，凯恩斯（Cairns）北部区域降雨量达250至400毫米。1994年2月18日至20日再次出现强降雨过程。尽管此次降雨的覆盖范围与强度均弱于赛迪气旋带来的降雨，但丹特里区域在1994年2月18日的降雨量仍达到约170毫米。