Abstract: A constructional delta system is mainly produced by the interaction of two different hydrodynamic processes between a river,which carries much mud and sand,and an ocean or a lake.Therefore,it is possible to use some theories of fluid dynamics and sedimentology to construct a mathematical model to describe the depositional process of a river delta,and solve the model by the method of numerical simulation.The application of this simulation may give an insight to the constructional process of a delta framework san dbody and analyze quantitatively the effects of some major factors on the formation of the sandbody,so that the characteristics of the distribution and internal heterogeneity of a deltic sandbody could be predicted.In this paper,the development of Luan river modern delta and the ancient fan delta of Yingtai in Daqing are simulated as examples for the actual application of such a technique.

摘要： 建设性三角洲沉积体系的形成主要是由于挟带泥沙的河流海洋与湖泊两种水动力相互作用的结果,因此可应用流休力学和沉积学中有关的理论建立河流三角洲沉积体系的数学模型,用数值法求解.运用这种方法,可以分析三角洲骨架砂体的形成过程,考察模型中各主要因素对其影响,以便预测三角洲砂体在沉积时的分布形态和内部特性.本文以滦河现代三角洲发育过程的数值模拟和大庆英台地区古扇三角洲的数值模拟为例,说明该方法在应用上的可行性.

关键词: 三角洲沉积体系, 数值模拟, 水动力学, 数学模型