面向城市浅层松散沉积物精细建模的格网水平粒度计算方法研究

Study on Calculation Method of Grid Size in the Areal Direction for Fine 3D Geological Modeling of Shallow Sediments in Urban Areas

格网水平粒度是影响城市地质三维属性模型精度的主要因素之一,但目前尚未得到足够重视。该文提出了一种与城市规划、建设及管理密切相关的城市浅层松散沉积物(沉积层)格网水平粒度的计算方法,通过误差最大化原理分别给出了不同沉积层延展状况下格网粒度的计算公式或经验值,然后综合考虑所有沉积层的权重,确定整个格网模型的水平粒度。利用淮北平原沉积相边界进行验证,证明该方法计算出的格网水平粒度可满足精度要求,可降低格网水平粒度确定过程中的主观性和随机性。

Grid size in the areal direction(GSAD)is one of the main factors affecting the accuracy of urban 3D property model,but it has not received enough attention yet.In this paper,a method is proposed for calculating the GSAD of shallow sediments(SS)closely related to urban planning,construction and management.And the GSAD calculation formulas and empirical values of different SS under the condition of error maximization are given.Then the GSAD of the whole grid model is determined by considering the weight of all SS.The sedimentary facies boundary of Huaibei Plain is used for verification.The results show that the GSAD calculated by the above-mentioned method can meet the accuracy requirements.This paper provides a theoretical basis for the determination of GSAD to a certain extent,which can reduce the subjectivity and randomness in the process of determining GSAD.