排序方式： 共有12条查询结果，搜索用时 15 毫秒
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西洋东大港水道流速垂线分布研究 总被引：2，自引：0，他引：2
对辐射沙洲海域东大港4#站位连续2个潮周期的流速测量资料进行了分析、研究,拟合给出了流速垂线分布关系,并根据实际测量资料确定了该站位6个水层的浑水水流尾流函数项表达式。这些表达式表明浑水水流尾流函数是相对深度和摩阻速度的函数。探讨分析了尾流函数的空间分布和潮周期过程。非恒定流的水流尾流函数项的准确表达,对于揭示含沙水流流速结构及水、沙相影响作用规律将起到启发和推动作用。 相似文献
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江苏近岸高、低潮位变化规律探讨 总被引：2，自引：0，他引：2
利用MForeman改进的G·Godin潮汐调和分析及预报程序对江苏省辐射沙洲海域的16个验潮站潮位资料进行了调和分析和潮汐预报。根据各测潮站高、低潮位预报结果,对各站高低潮潮时差、低潮每日延迟时间、高潮每日延迟时间进行了统计计算,并对辐射沙洲海域高低潮潮时差特征值的分布进行了分析。利用潮汐表预报结果探讨了江苏沿岸6站的高潮位、低潮位、高低潮潮时差、高潮每日延迟时间、低潮每日延迟时间之间的对应关系,并分析给出了各量的变化周期。 相似文献
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利用改进的G·Godin潮流调和分析程序对辐射沙洲腹地水道中的29个测量站位连续2个潮周期准同步流速测量数据进行调和分析,得到9个分潮的调和常数及椭圆要素,对M2分潮潮流空间分布特征进行了分析。该海域M2分潮占优,潮流类型为正规半日潮。水道水流表现为往复流运动,主流向与岸线或水道的走向一致。流矢旋转在空间上表现较为复杂,在表层多体现为顺时针方向旋转运动。分析发现地形因素对中、底层旋转方向有较大影响。根据分析结果,对所测站位M2分潮潮流迟角和潮流浅水影响因子进行了计算分析。潮流浅水影响在沙脊及浅滩、浅沟上相对较大,浅水分潮影响随水深向下而增大。 相似文献
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Based on a coupled hydrodynamic-ecological model for regional and shelf seas (COHERENS), a three-dimensional baroclinic model
for the Changjiang (Yangtze) River estuary and the adjacent sea area was established using the sigma-coordinate in the vertical
direction and spherical coordinate in the horizontal direction. In the study, changing-grid technology and the “dry-wet” method
were designed to deal with the moving boundary. The minimum water depth limit condition was introduced for numerical simulation
stability and to avoid producing negative depths in the shallow water areas. Using the Eulerian transport approaches included
in COHERENS for the advection and dispersion of dissolved pollutants, numerical simulation of dissolved pollutant transport
and diffusion in the Changjiang River estuary were carried out. The mass centre track of dissolved pollutants released from
outlets in the south branch of the Changjiang River estuary water course has the characteristic of reverse current motion
in the inner water course and clockwise motion offshore. In the transition area, water transport is a combination of the two
types of motion. In a sewage-discharge numerical experiment, it is found that there are mainly two kinds of pollution distribution
forms: one is a single nuclear structure and the other is a double nuclear (dinuclear) structure in the turbid zone of the
Changjiang River estuary. The rate of expansion of the dissolved pollutant distribution decreased gradually. The results of
the numerical experiment indicate that the maximum turbid zone of the Changjiang River estuary is also the zone enriched with
pollutants. Backward pollutant flow occurs in the north branch of the estuary, which is similar to the backward salt water
flow, and the backward flow of pollutants released upstream is more obvious. 相似文献
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Numerical simulation of the transport and diffusion of dissolved pollutants in the Changjiang(Yangtze)River estuary 总被引：1，自引：0，他引：1
Based on a coupled hydrodynamic–ecological model for regional and shelf seas (COHERENS), a three-dimensional baroclinic model for the Changjiang (Yangtze) River estuary and the adjacent sea area was established using the sigma-coordinate in the vertical direction and spherical coordinate in the horizontal direction. In the study, changing-grid technology and the "dry-wet" method were designed to deal with the moving boundary. The minimum water depth limit condition was introduced for numerical simulation stability and to avoid producing negative depths in the shallow water areas. Using the Eulerian transport approaches included in COHERENS for the advection and dispersion of dissolved pollutants, numerical simulation of dissolved pollutant transport and diffusion in the Changjiang River estuary were carried out. The mass centre track of dissolved pollutants released from outlets in the south branch of the Changjiang River estuary water course has the characteristic of reverse current motion in the inner water course and clockwise motion offshore. In the transition area, water transport is a combination of the two types of motion. In a sewage-discharge numerical experiment, it is found that there are mainly two kinds of pollution distribution forms: one is a single nuclear structure and the other is a double nuclear (dinuclear) structure in the turbid zone of the Changjiang River estuary. The rate of expansion of the dissolved pollutant distribution decreased gradually. The results of the numerical experiment indicate that the maximum turbid zone of the Changjiang River estuary is also the zone enriched with pollutants. Backward pollutant flow occurs in the north branch of the estuary, which is similar to the backward salt water flow, and the backward flow of pollutants released upstream is more obvious. 相似文献