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Process-response modelling of fluvio-deltaic stratigraphy

机译：河流-三角洲地层的过程响应模型

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Numerical modelling is a tool to investigate the controls on the formation of the stratigraphic record on geological timescales. The model presented in this paper (DELTAS1M) uses a process-response approach that simulates the stratigraphy of fluvial-dominated deltaic systems in two dimensions, based on simplified diffusion rules of cross-shore sedimentation. Net sedimentation is calculated for individual grain-size classes as the sum of independent erosion and deposition functions, enabling simulations of fluvio-deltaic stratigraphy besides clinoform evolution. Critical sediment transport parameters are validated using synthetic data from a process-based morphodynamic model, DELFT3D. Generic experiments show the effect of changes in sea level, sediment supply, offshore gradient and sediment size distribution. These experiments show that the model is fully capable of reproducing classic concepts of delta development on geological timescale. Such experiments allow students a possibility to evaluate the controls on the formation of the stratigraphic record. DELTASIM has been successfully applied to improve the understanding of the sedimentary evolution of a real-world fluvial-dominated delta in the Caspian Sea. Additional functionality encompasses a stochastic discharge model that can be used as input to simulate series of scenarios of delta development using the model's rapid run time to our advantage. This functionality enables us to present probabilistic output of longitudinal stratigraphic sections as an alternative to the deterministic predictions often made by stratigraphic models. The characteristics of the model; simplicity, speed and compatibility of the output to conceptual sequence stratigraphic models make DELTASIM suitable as a teaching tool.
机译：数值模拟是研究地质时标上地层记录形成控制的一种工具。本文提出的模型（DELTAS1M）使用过程响应方法，基于简化的跨岸沉积扩散规则，在二维方向上模拟了以河流为主导的三角洲系统的地层学。净沉降量是针对单个晶粒度类别计算的，作为独立的侵蚀和沉积函数的总和，从而能够模拟流变三角洲地层，除了斜状演化。使用基于过程的形态动力学模型DELFT3D的合成数据验证了关键的沉积物输运参数。常规实验表明，海平面，沉积物供应，海上坡度和沉积物尺寸分布的变化会产生影响。这些实验表明，该模型完全能够在地质时标上再现三角洲发育的经典概念。这样的实验使学生有可能评估对地层记录形成的控制。 DELTASIM已成功应用于增进人们对里海真实河流为主的三角洲沉积演化的了解。其他功能还包括一个随机排放模型，该模型可以用作输入，以利用该模型的快速运行时间来模拟三角洲开发的一系列情况，从而发挥我们的优势。此功能使我们能够呈现纵向地层剖面的概率输出，以替代通常由地层模型做出的确定性预测。模型的特征；输出，与概念层序地层模型的简单性，速度和兼容性使得DELTASIM适合用作教学工具。

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