陈耀登, 闵锦忠, 高玉芳. 涌潮河口底摩擦系数伴随资料同化研究[J]. 水科学进展, 2011, 22(3): 400-406.
引用本文: 陈耀登, 闵锦忠, 高玉芳. 涌潮河口底摩擦系数伴随资料同化研究[J]. 水科学进展, 2011, 22(3): 400-406.
CHEN Yao-deng, MIN Jin-zhong, GAO Yu-fang. Study of bottom friction coefficient in tidal bore affected estuaries using the adjoin method of data assimilation[J]. Advances in Water Science, 2011, 22(3): 400-406.
Citation: CHEN Yao-deng, MIN Jin-zhong, GAO Yu-fang. Study of bottom friction coefficient in tidal bore affected estuaries using the adjoin method of data assimilation[J]. Advances in Water Science, 2011, 22(3): 400-406.

涌潮河口底摩擦系数伴随资料同化研究

Study of bottom friction coefficient in tidal bore affected estuaries using the adjoin method of data assimilation

  • 摘要: 为更合理选取涌潮河口的底摩擦系数,基于无结构三角网格和有限体积法,建立了适用于反演潮汐涌潮河口底摩擦系数随空间和涨、落潮变化的伴随资料同化模型。一系列"孪生"实验均较精确地反演出了给定底摩擦系数。孪生实验表明底摩擦系数的空间分布会影响反演的精度,也表明充足的观测数据资料能够提高反演的准确性。利用实测数据进行了钱塘江河口伴随同化实验,得到涨、落潮底摩擦系数分别为0.000149和0.001520(相当于曼宁系数为0.012206和0.038987),利用该值模拟出了潮波变形和涌潮形成等现象,验证了前人在钱塘江河口数值模拟时关于底摩擦系数选取经验的合理性,反映了钱塘江河口底摩擦"涨小落大"的实质。

     

    Abstract: Based on the unstructured meshes and uses finite volume method,an adjoint model of data assimilation is established to study the variation of Bottom Friction Coefficients (BFCs) in tidal bore affected estuaries and to inversely estimate the spatial and temporal variation of BFCs during flood or ebb tide.A series of twin experiments on the BFCs were carried out in a generalized estuary.The experiment indicates that the existence of large spatial variation in BFCs will have a negative effect on the inversed result.The result can be improved with the increase in assimilated observations.The adjoint model is tested using the observed data in the Qiantang Estuary.The derived BFCs during the flood and ebb tide are 0.000149 and 0.001520 (equivalent to 0.012206 and 0.038987 of Manning coefficients),respectively.Both deformation of tidal waves and occurrence of tide bores are successfully simulated using the inversed values of BFCs.The result reconfirms the previous findings that the BFCs during the flood are smaller than that during the ebb in the Qiantang Estuary.

     

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