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Modelling of Solute Transport under Flow Conditions Varying in Time, Using the Channel Network Model

机译:流量条件下溶质运输的建模,随着时间的流量条件,使用信道网络模型

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Transport of radionuclides from a repository to the biosphere is calculated in the presence of varying boundary conditions. This may occur in Sweden, for example, during post-glacial rebound. To calculate the transport of radionuclides, the flow field has to be calculated at each time step. An alternative approach is to determine the flow field at certain time intervals; i.e., modelling the dynamic flow system as a sequence of punctuated steady states. This can be done in a rather simple way by using the Channel Network model (CNM), in which radionuclide transport is calculated by particle tracking. Intuitively one would expect such a simple procedure to be permissible and lead to small errors if the time intervals are so short that only small changes in flow rates and flow directions take place. In this paper, the technique is applied to a study case. This describes a repository located at a sub sea level location outside the coastline; where, owing to the land lift that is taking place in Scandinavia the coastline is advancing towards the repository. An important issue to be determined is the minimum number of time intervals that need to be used in order to obtain a reliable solution to radionuclide transport. It is found that the number of time intervals needed is strongly dependent on the variation in the boundary conditions. For the changing conditions used in the example tested, a number on the order of 5-9 time intervals allows a sufficiently good representation of the transport.
机译:在存在不同的边界条件存在下计算从储存库到生物圈的放射性核素的运输。这可能发生在瑞典,例如,在冰川后反弹期间。为了计算放射性核素的传输,必须在每次步骤计算流场。另一种方法是以特定时间间隔确定流场;即,将动态流量系统建模为标点稳态的序列。这可以通过使用信道网络模型(CNM)以一种相当简单的方式来完成,其中通过粒子跟踪计算放射性核素传输。直观的人会期望这样一个简单的程序是允许的,并且如果时间间隔如此短暂,那么只有流速和流动方向的变化很小。在本文中,该技术应用于研究案例。这描述了位于海岸线以外的子海平位置的存储库;在哪里,由于斯堪的纳维亚岛上的陆地升降机,海岸线正在向存储库推进。要确定的一个重要问题是需要使用的最小时间间隔,以便获得可靠的放射性核素运输解决方案。发现所需的时间间隔数强烈地取决于边界条件的变化。对于测试的示例中使用的变化条件,5-9个时间间隔的数量允许足够好的传输表示。

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