Impact of operational model nesting approaches and inherent errors for coastal simulations

Impact of operational model nesting approaches and inherent errors for coastal simulations
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操作模型嵌套方法和固有误差对沿海模拟的影响

DOI:
10.1016/j.ocemod.2016.10.005
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发表时间:
2016
期刊:
影响因子:
3.2
通讯作者:
Brown J
Brown J
中科院分区:
地球科学3区
文献类型:
--
作者:
Brown J

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高潮条件下的淡水影响区(ROFI)被用来演示嵌套业务模拟系统的固有问题。这些问题可能影响到对陆架海内淡水输出的准确模拟,因此在沿海海洋模型研究中必须加以考虑。在利物浦湾(我们在英国的研究地点),来自3个大河口的淡水流入形成了一个沿海前沿,随着潮汐和风而移动。随着富含营养物和污染物的淡水被引入到海岸系统中,分层和再混合的循环发生对于海洋地球化学循环是重要的。验证方法,使用固定系泊和巡航断面的沿海观测,用于评估模拟的ROFI,通过改进的空间结构和时间变化的前,作为指导最佳实践模型设置。一个结构化的建模系统,使用嵌套在1.8公里的网格内的180米的网格演示了如何补偿误差在较粗的分辨率可以有一个嵌套的,高分辨率的应用程序的不利影响。使用2008年,一年的典型的平静和风暴期间与可变河流的影响,初始和边界条件的ROFI动态的敏感性进行了研究。结果表明,初始水柱结构的准确表示是重要的,在区域尺度和边界条件是最重要的,在沿海尺度。虽然增加网格分辨率捕捉锋面结构,锋面位置的准确性是由离岸边界条件,因此,粗糙的区域模型的准确性。
A region of freshwater influence (ROFI) under hypertidal conditions is used to demonstrate inherent problems for nested operational modelling systems. Such problems can impact the accurate simulation of freshwater export within shelf seas, so must be considered in coastal ocean modelling studies. In Liverpool Bay (our UK study site), freshwater inflow from 3 large estuaries forms a coastal front that moves in response to tides and winds. The cyclic occurrence of stratification and remixing is important for the biogeochemical cycles, as nutrient and pollutant loaded freshwater is introduced into the coastal system. Validation methods, using coastal observations from fixed moorings and cruise transects, are used to assess the simulation of the ROFI, through improved spatial structure and temporal variability of the front, as guidance for best practise model setup. A structured modelling system using a 180 m grid nested within a 1.8 km grid demonstrates how compensation for error at the coarser resolution can have an adverse impact on the nested, high resolution application. Using 2008, a year of typical calm and stormy periods with variable river influence, the sensitivities of the ROFI dynamics to initial and boundary conditions are investigated. It is shown that accurate representation of the initial water column structure is important at the regional scale and that the boundary conditions are most important at the coastal scale. Although increased grid resolution captures the frontal structure, the accuracy in frontal position is determined by the offshore boundary conditions and therefore the accuracy of the coarser regional model.
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