A new approach for the modelling of sediment reworking induced by a macrobenthic community
A new approach for the modelling of sediment reworking induced by a macrobenthic community
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DOI：
10.1023/a:1000636109604
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发表时间：
1997-11-01
影响因子：
1.3
通讯作者：
Stora, G
中科院分区：
文献类型：
--
作者：
François, F;Poggiale, JC;Stora, G
本文提出了一种新的生物扰动模型来描述大型底栖动物群落引起的短期沉积物改造。模型的设计必须考虑混合过程，首先是在生物体水平上，其次是在群落水平上。本文介绍了作者提出的生物扩散器、上向输送器、下向输送器和再生器四种生物扰动器的混合方式。这些子模型的数学公式由常微分方程组成。它们考虑到生物扰动区的大小、进入水柱的输出通量、示踪剂衰减、由于当地水流造成的物理混合以及生物扰动过程的类型和强度。这些子模型可以正确地描述在具有每种类型的生物扰动器的岩心中发生的混合事件。它们还提供了一般生物扰动模型的基础，该模型将考虑（i）不同生物扰动过程及其特征，（ii）不同过程之间的干扰，以及（iii）可能预测颗粒改造，以便将其纳入早期成岩作用中有机质的研究。
A new model of bioturbation has been developed to describe short term sediment reworking induced by macrobenthic communities. The design of the model had to consider the mixing processes, firstly, at the organism level, and secondly, at community level. This paper describes the mixing mode of the four types of bioturbators defined by the authors: the biodiffusors, the upward-conveyors, the downward-conveyors and the regenerators. The mathematical formulation of these sub-models consists of ordinary differential equations. They take into account the size of the bioturbated zone, the output fluxes to the water column, tracer decay, physical mixing due to local currents and the type and intensity of the bioturbation processes. These sub-models make it possible to describe correctly the mixing events that have occurred in cores with each type of bioturbator. They also provide the basis for general bioturbation model, that will take into account the respective degrees of involvement of (i) the different bioturbation processes and their characteristics, (ii) the interference between the different processes, and (iii) make possible to predict the particle reworking in order to include it in studies of organic matter in early diagenesis.