GEOGRAPHIC AND HYDRODYNAMIC CHARACTERISTICS OF SHALLOW COASTAL LAGOONS
GEOGRAPHIC AND HYDRODYNAMIC CHARACTERISTICS OF SHALLOW COASTAL LAGOONS
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DOI：
10.1016/0025-3227(89)90097-2
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发表时间：
1989-08-01
期刊：
影响因子：
2.9
通讯作者：
MAGILL, KE
中科院分区：
文献类型：
--
作者：
KJERFVE, B;MAGILL, KE
沿海泻湖可以很方便地根据地貌分为渗漏，限制或堵塞系统。该分区根据与沿海海洋的水交换对沿海泻湖进行水动力学排序。渗漏系统的周转时间最短，受限泻湖的周转时间较长，堵塞泻湖的周转时间最长。在泄漏的沿海泻湖，振荡的潮流占大部分的流量方差和面具的剩余电流，由于风和淡水引起的密度梯度。在限制性泻湖中，潮汐、风和淡水径流驱动着环流的组成部分。风通常是造成阻塞泻湖环流和混合的主要因素，与沿海海洋的水交换在很大程度上取决于水文循环。沿海泻湖通常混合良好，但由于淡水径流和垂直梯度，由于太阳辐射或表面冷却，可以表现出显着的水平梯度。在一般情况下，河流入流和热平衡引起分层在沿海泻湖，而风和潮汐引起混合。沿海泻湖通常捕获无机沉积物和有机物，因此作为物质汇。在地质时间尺度上，它们是短暂的景观特征，其存在与过滤效率和相对海平面变化有着内在的联系，这些变化是冰川海平面变化周期和局部构造活动的结果。
Coastal lagoons can be conveniently separated based on geomorphology into leaky, restricted or choked systems. This subdivision orders coastal lagoons hydrodynamically according to water exchange with the coastal ocean. Leaky systems have the shortest turnover time, restricted lagoons have a longer turnover time, and choked lagoons have the longest turnover time. In leaky coastal lagoons, oscillating tidal currents account for most of the flow variance and mask residual currents due to wind- and freshwater-induced density gradients. In restricted lagoons, tides, winds, and freshwater runoff drive components of the circulation. Winds are usually dominant in causing circulation and mixing in choked lagoons, and water exchange with the coastal ocean largely depends on the hydrologic cycle. Coastal lagoons are usually well mixed, but can exhibit significant horizontal gradients due to freshwater runoff and vertical gradients due to solar radiation or surface cooling. In general, river inflow and heat balance induce stratification in coastal lagoons, whereas winds and tides cause mixing. Coastal lagoons usually trap inorganic sediment and organic matter, thus serving as material sinks. On a geologic time scale, they are short-lived landscape features, with an existence intrinsically linked to filtering efficiency and relative sea-level change as a result of glacioeustatic cycles and local tectonic activity.