Oregon inlet: Hydrodynamics, volumetric flux and implications for larval fish transport
Oregon inlet: Hydrodynamics, volumetric flux and implications for larval fish transport
复制标题
俄勒冈州入口：流体动力学、体积通量及其对幼鱼运输的影响
DOI：
--
复制
发表时间：
1997
期刊：
影响因子：
--
通讯作者：
L. Pietrafesa
中科院分区：
文献类型：
--
作者：
C. R. Nichols;L. Pietrafesa
使用时域和频域分析来分析俄勒冈湾水流对大气强迫和海平面波动的时间响应。使用俄勒冈湾内外的数据集来识别时间上持续且空间上广泛的潮汐和洪水事件。进行棱镜估计以生成通过入口输送的水的体积通量的时间序列。通过俄勒冈湾流入帕姆利科海峡的水团在温度 (T) 和盐度 (S) 空间中进行识别，以确定其来源。考察了大气风场、进水口水位主轴斜率、进水流量与T、S特性之间的相关性。研究发现，天气尺度的大气风事件会极大地直接影响水流向（远离）海洋一侧的入口的输送，同时也会影响来自（朝向）河口一侧入口的水的输送，以及随后通过俄勒冈湾流入（流出）河口的洪水。因此，虽然天文潮汐洪水和退潮事件被证明是单侧的，因为沿海水域无论是建立还是下降，天气尺度的风事件都显示为在入口内部和外部的两侧同相响应建立和下降，因此在驱动水流通过入口方面非常有效。这些亚惯性频率的洪水事件被认为对于将河口依赖的幼鱼从沿海海洋招募到帕姆利科海峡并随后将其保留下来至关重要。这些终点的年级强度可以每年根据这些气候风事件的相对强度和时间来确定。«更少
The temporal response of Oregon Inlet currents to atmospheric forcing and sea level fluctuations is analyzed using time and frequency domain analysis. Temporally persistent and spatially extensive ebb and flood events are identified using data sets from both within and outside of Oregon Inlet. Prism estimates are made to generate a time series of volumetric flux of water transported through the inlet. Water masses flooding into the Pamlico Sound via Oregon Inlet are identified in temperature (T) and salinity (S) space to determine their source of origin. Correlations are examined between the atmospheric wind field, the main axial slope of the inlet`s water level, inlet flow and T, S properties. Synoptic scale atmospheric wind events are found to dramatically and directly affect the transport of water towards (away from) the inlet on the ocean side, in concert with the contemporaneous transport away from (towards) the inlet on the estuary side, and a subsequent flooding into (out of) the estuary via Oregon Inlet. Thus, while astronomical tidal flooding and ebbing events are shown to be one-sided as coastal waters either set-up or set-down, synoptic scale wind events are shown to be manifested as a two-sided in-phase response set-up and set-down insidemore » and outside the inlet, and thus are extremely effective in driving currents through the inlet. These subinertial frequency flood events are believed to be essential for both the recruitment and subsequent retention of estuarine dependent larval fish from the coastal ocean into Pamlico Sound. Year class strength of these finish may be determined annually by the relative strength and timing of these climatological wind events.« less