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首页> 外文期刊>Marine Geology >The use of modeling and suspended sediment concentration measurements for quantifying net suspended sediment transport through a large tidally dominated inlet
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The use of modeling and suspended sediment concentration measurements for quantifying net suspended sediment transport through a large tidally dominated inlet

机译：利用建模和悬浮泥沙浓度测量来量化通过大型潮汐主导入口的净悬浮泥沙输送

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Sediment exchange at large energetic inlets is often difficult to quantify due complex flows, massive amounts of water and sediment exchange, and environmentar conditions limiting long-term data collection. In an effort to better quantify such exchange this study investigated the use of suspended sediment concentrations (SSC) measured at an offsite location as a surrogate for sediment exchange at the tidally dominated Golden Gate inlet in San Francisco, CA. A numerical model was calibrated and validated against water and suspended sediment flux measured during a spring-neap tide cycle across the Golden Gate. The model was then run for five months and net exchange was calculated on a tidal time-scale and compared to SSC measurements at the Alcatraz monitoring site located in Central San Francisco Bay ~5 km from the Golden Gate. Numerically modeled tide averaged flux across the Golden Gate compared well (r~2 = 0.86, p-value <0.05) with 25 h low-pass filtered (tide averaged) SSCs measured at Alcatraz over the five month simulation period (January through April 2008). This formed a basis for the development of a simple equation relating the advective flux at Alcatraz with suspended sediment flux across the Golden Gate. Utilization of the equation with all available Alcatraz SSC data resulted in an average export rate of 1.2 Mt/yr during water years 2004 through 2010. While the rate is comparable to estimated suspended sediment inflow rates from sources within the Bay over the same time period (McKee et al., 2013-this issue), there was little variation from year to year. Exports were computed to be greatest during the wettest water year analyzed but only marginally so.
机译：由于复杂的流量，大量的水和沉积物交换以及环境条件限制了长期数据收集，大型高能入口的泥沙交换通常难以量化。为了更好地量化这种交换，本研究调查了在异地位置测量的悬浮泥沙浓度（SSC）的使用，作为加利福尼亚旧金山潮汐主导的金门大桥入口处泥沙交换的替代物。针对跨金门的春季潮汐周期中测量的水和悬浮泥沙通量，对数值模型进行了校准和验证。然后，该模型运行了五个月，并根据潮汐时间尺度计算了净交换量，并将其与位于距金门大桥约5公里的中央旧金山湾的恶魔监测站的SSC测量值进行了比较。在五个月的模拟期间（2008年1月至2008年4月），在恶魔岛上测量的经过25 h低通滤波（潮汐平均）的SSC时，通过金门大桥进行数值模拟的潮汐平均通量进行了很好的比较（r〜2 = 0.86，p值<0.05）。 ）。这为建立一个简单方程式奠定了基础，该方程式将恶魔岛的对流与悬浮在金门上的泥沙通量联系起来。利用该方程式和所有可用的恶魔岛南南合作数据，得出2004年至2010年水年期间的平均出口速率为1.2吨/年。 McKee等人，2013年-此期），每年之间几乎没有变化。计算得出，在分析的最湿水年中，出口量最大，但仅略有增加。

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