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首页> 外文期刊>Estuarine Coastal and Shelf Science >Transverse variability of flow on both sides of a sill/contraction combination in a fjord-like inlet of southern Chile
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Transverse variability of flow on both sides of a sill/contraction combination in a fjord-like inlet of southern Chile

机译：智利南部峡湾样入口的门槛/收缩组合两侧的水流横向变化

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摘要

Water velocity and density profiles were obtained over a semidiurnal tidal cycle to describe the transverse variability of flow in either side of Galvarino Pass, a sill/contraction combination in a fjord-like inlet in southern Chile (44.4°S). Velocity profiles were obtained with a 614.4 kHz Acoustic Doppler Current Profiler (ADCP) during eight repetitions of a circuit that consisted of along-fjord transects along the pass and cross-fjord transects at either side of the pass. The geomorphology in Galvarino Pass represents a coastline contraction of about 90%, decreasing from 2000 m to 200 m in just 1500 m in the along-channel direction. Depth varies from 40 m on the landward side of the pass to 10 m at the shallowest portion of the sill to 80 m south of the pass. The mean flow in the northern side of the pass showed a tendency of the flow to rotate anticlockwise throughout the water column. This feature should result in a sluggish flushing of the northern side. South of the pass, mean surface outflow and mean bottom inflow (at 20 m) developed near the western side of the fjord. Within the pass, the shallowest and narrowest section represented a boundary between inflows and outflows. The strongest net inflows (～15 cm/s) were observed in the sill region and the strongest outflows (～10 cm/s) were seen to the south of the pass. The magnitude of the tidal flows increased inside the pass, reaching a maximum over the sill, and then decreased northward owing to conservation of mass. In the across-channel momentum balance the advective terms seemed to be greater than the rest of the terms in the northern end of the pass and over the sill. Magnitudes of the terms in the along-channel momentum balance were comparable to those in the across-channel direction, highlighting the importance of the transverse dimension under strong geometric constraints.
机译：在半日潮周期中获得了水速和密度剖面图，以描述Galvarino Pass两侧水流的横向变化，Galvarino Pass是智利南部峡湾状进水口（44.4°S）的坎ill /收缩组合。在一个电路的八次重复过程中，使用614.4 kHz声学多普勒电流剖面仪（ADCP）获得了速度剖面，该电路包括沿通道的沿峡断面和通道两边的跨峡断面。加尔瓦里诺山口的地貌代表海岸线收缩约90％，仅在沿通道方向1500 m内从2000 m减小到200 m。深度从通道的陆侧40 m到门槛最浅处的10 m到通道以南的80 m不等。通行证北侧的平均流量显示出整个水柱中的流量都有逆时针旋转的趋势。此功能应导致北侧冲洗缓慢。通行证的南部，在峡湾西侧附近形成了平均地表流出量和平均底部流入量（20 m）。在通道内，最浅和最窄的部分代表流入和流出之间的边界。在门槛区域观察到最强的净流入量（〜15 cm / s），在通行证的南部观察到最强的净流入量（〜10 cm / s）。潮汐流的量在通道内增大，在门槛上达到最大值，然后由于质量守恒向北减小。在跨通道动量平衡中，对流项似乎比通行证北端和窗台上的其余项都大。沿通道动量平衡的项的量级与跨通道方向的项的量级可比，突出了横向尺寸在强几何约束下的重要性。

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