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131.
132.
According to analysis on field data obtained by ADCP(Acoustic Doppler Current Profiler),the flow regime of the Yangtze River Estuary is studied by use of a 3-D numerical model.The flow field characteristics,under the influence of Coriolis force,saltwater intrusion and freshwater inflow and tidal current interaction,are depicted in details.The main driving forces and some important effective factors of lateral,longitudinal and horizontal circulation are also analyzed. 相似文献
133.
ADCP测量悬沙浓度的可行性分析与现场标定 总被引:18,自引:3,他引:18
根据现场观测数据,对ADCP测量悬浮沙浓度的进行标定实验。结果表明,在观测期间悬沙粒径变化较小的条件下,后散射强度与水样悬沙浓度之间存在较好的相关性。悬沙浓度剖面标定公式中的参数C′可用剖面实测水样浓度来确定,该参数与浓度密切相关:同一剖面不同浓度之间有一定的波动,但同一浓度不同潮时的变化很小。使用同一剖面参数C′的平均值计算出的剖面悬沙分布误差较大(29%-43%),而按不同深度段分别标定,误差可以小于20%,能够满足沉积动力学研究的需要。 相似文献
134.
A method has been developed to monitor the surface velocity field by combining repeated acoustic Doppler current profiler
(ADCP) observations and satellite altimetry data. The geostrophic velocity anomaly is calculated from the sea surface height
anomaly field estimated from the altimetry data by an optimal interpolation. It has been confirmed that this accurately observes
the smoothed velocity anomaly field when the interpolation scales are set according to the spatio-temporal sampling pattern
of the altimeter used. The velocity anomaly obtained from the altimetry data is subtracted from the repeated ADCP observations
to estimate temporal mean velocity along the ship tracks. Regularly sampled, nine-year time series of surface velocity can
then be obtained by adding the computed mean velocity and the altimetry anomaly components. This clearly illustrates surface
velocity fluctuations such as the movement of the Kuroshio axis due to its meandering and an increase of the interannual variability
of the Subtropical Countercurrent toward its downstream region.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
135.
Characteristics of coastal-trapped waves induced by typhoon along the southeast coast of Honshu,Japan 总被引:1,自引:0,他引:1
Mooring observations using ADCP, electromagnetic current meters and thermometers were performed to clarify the vertical and
horizontal structure of coastal-trapped waves (CTWs) on continental shelf and slope on the eastern side of Sagami Bay, Japan,
in August and September 2003. A strong inflow associated with CTW caused by Typhoon 0315 (CTW15) was observed with remarkable
downwelling. The maximum current due to CTW15 was over 100 cm s−1, confined to the upper layer shallower than 90 m. The CTW (CTW10) induced by Typhoon 0310, was associated with the coastal
upwelling and maximum outflow was 33 cm s−1; the currents were extended near the bottom at 230 m depth. Remarkable discrepancies were found between the current structures
of CTWs. CTW15 was explained by superposing the second CTW mode on the first CTW mode, whereas CTW10 was explained by the
first CTW mode. The generation and propagation processes of both CTWs were reproduced by numerical experiments using a three-dimensional
level model. The model results indicated that the difference of modal characteristics between CTW15 and CTW10 already exists
in the CTW generation region and are due to difference of the wind direction, i.e., the typhoon’s path. 相似文献
136.
60m船用多功能ADCP悬浮沙浓度测量及比测数据分析 总被引:2,自引:0,他引:2
本文简述了60m船用多功能ADCP悬浮泥沙测量的理论依据,并详细分析了正样长江徐六级水文站附近水域悬浮沙比测试验情况和结果。 相似文献
137.
A unique, five-year long data set of ferry-mounted ADCP measurements in the Marsdiep inlet, the Netherlands, obtained between 1998 and 2003, is presented. A least-squares harmonic analysis was applied to the water transport, (depth-averaged) currents, and water level to study the contribution of the tides. With 144 tidal constituents, maximally 98% of the variance in the water transport and streamwise currents is explained by the tides, whereas for the stream-normal currents this is maximally 50%. The most important constituent is the semi-diurnal M2 constituent, which is modulated by the second-largest S2 constituent (about 27% of M2). Compound and overtides, such as 2MS2, 2MN2, M4, and M6, are important in the inlet. Due to interaction of M2 with its quarter-diurnal overtide M4, the tidal asymmetry in the southern two thirds of the inlet is flood dominant. The amplitudes of all non-astronomic constituents are largest during spring tides, strongly distorting the water level and velocity curves. The M2 water transport is 40° ahead in phase compared to the M2 water level, reflecting the progressive character of the tidal wave in the inlet. The currents are strongly rectilinear and they are sheared vertically and horizontally, with the highest currents at the surface above the deepest part of the inlet. During spring tides, near-surface currents can be as large as 1.8 m s− 1. Due to the relative importance of inertia compared to friction, the M2 currents near the centre (surface) lag maximal 20° (3°) in phase with the currents near the sides (bottom). The tidal-mean currents are directed into the basin in the shallower channel to the south and out of the basin in the deeper channel to the north. 相似文献
138.
139.
140.
A three-dimensional primitive-equation model is used to simulate the Long Island Sound (LIS) outflow for a 1-year (2001) period. The model domain includes LIS and New York Bight (NYB). Tidal and wind forcing are included, and seasonal salinity and temperature variations are assimilated. The model results are validated with the HF radar, moored acoustic Doppler current profiler (ADCP), and ferry-based ADCP observations. The agreement between simulated and observed flow patterns generally is very good. The difference in seasonal mean currents between the model and moored ADCP is about 0.01 m/s; the correlation of dominant velocity fluctuations between the model and HF radar is 0.83; and the difference in mean LIS transport between the model and shipboard ADCP is about 5%. However, the model predicts a prominent tidally generated headland eddy not supported by the HF radar observation. The model sensitivity study indicates that the tides, winds, and ambient coastal front all have important impact on the buoyant outflow. The tides and winds cause stronger vertical mixing, which reduces the surface plume strength. The ambient coastal front, on the other hand, tends to enhance the plume. 相似文献