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The mechanisms driving the salt flux in the Modaomen estuary were investigated using measurements from along-channel shipboard surveys over a spring-neap tide cycle. During the investigation, river discharge was controlled to increase sharply and then decrease gently. The measurement data were analyzed with composition method. The results show that exchange flow varied significantly over the spring–neap cycle, being weakest during middle tides and strongest during neap tides. It could be concluded that sub-tidal vertical shear dispersion, resulting from the estuarine exchange flow, is the dominant mechanism driving the salt flux since the salt flux resulting from vertical shear dispersion varies in amplitude by over an order of magnitude, which is close to two times as large as the variation of advective salt flux.

Abstract Of all the hyperspectral imaging system using the optical filtering elements available,. AOTF(Acousto-optic tunable filters) is best to choose a filtering optical element that has high-speed spectral selectivity with high resolution, it can greatly reduces the amount of data collection and processing. In this paper , First, the work principle of AOTF was introduced, then described the AOTF imaging system, it covers the spectral band from 400nm to 900nm with a spectral resolution of near 2nm at 400nm and 10nm at 900nm. The device can provide about 2.2° view field angle and 10mm aperture, which included TeO2crystal, image optical system, a charged coupled device(CCD)camera, rf electronics and control and processing software. Finally the paper presented the results of laboratory image testing.