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首页> 外文期刊>Journal of Physical Oceanography >Asymmetric Estuarine Responses to Changes in River Forcing: A Consequence of Nonlinear Salt Flux
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Asymmetric Estuarine Responses to Changes in River Forcing: A Consequence of Nonlinear Salt Flux

机译:河口强迫变化的非对称河口响应:非线性盐通量的结果

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摘要

A linear theory for estuarine adjustment to river forcing as put forth by MacCready is extended to allow for quantification of nonlinear salt flux induced by gravitational exchange flow. It has been shown that, under a steplike change of river forcing, the estuarine responses are asymmetric, with the salinity field adjusting faster during the rising discharge. The asymmetry arises because the up-estuary salt flux due to exchange flow is a nonlinear function of estuarine length L-3. During the rising discharge, the estuary is longer, and the salt flux is comparatively less sensitive to the length variations. As a result, the up-estuary salt transport cannot keep pace with the rate of discharge changes, leading to a larger net salt flux and thus a shorter response time. A simple theory accounting for the nonlinear effect is then applied to Hudson-like systems and shown to capture the asymmetric response. The asymmetry is generalizable to other estuarine regimes where up-estuary salt fluxes are expressed as nonlinear power laws.
机译:MacCready提出的河口对河道强迫调整的线性理论得到扩展,可以量化由重力交换流引起的非线性盐通量。研究表明,在河流强迫的阶梯式变化下,河口响应是不对称的,盐度场在上升流量时调整得更快。之所以出现不对称,是因为由于交换流而引起的上河口盐通量是河口长度L-3的非线性函数。在上升的放电过程中,河口较长,盐通量对长度变化的敏感性相对较低。结果,河口上部盐的运输不能跟上排水量变化的速度,从而导致较大的净盐通量,从而缩短了响应时间。然后,将解决非线性效应的简单理论应用于类似Hudson的系统,并显示出其捕获非对称响应。不对称性可以推广到其他河口地区,其中河口上的盐通量表示为非线性幂定律。

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  • 来源
    《Journal of Physical Oceanography》 |2015年第11期|2836-2847|共12页
  • 作者

    Chen Shih-Nan;

  • 作者单位

    Natl Taiwan Univ, Inst Oceanog, 1,Sec 4,Roosevelt Rd, Taipei 106, Taiwan;

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  • 原文格式 PDF
  • 正文语种 eng
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