Inner boundary conditions describe the interaction of groundwater wells with the surrounding aquifer during pumping and are associated with well‐skin damage that limits water production and water derived from wellbore storage. Pumping test evaluations of wells during immediate and early time flow require assignment of inner boundary conditions. Originally, these concepts were developed for vertical well screens, and later transferred to wellbores intersecting highly conductive structures, such as preferential flow zones in fractured and karstic systems. Conceptual models for pumping test analysis in complex bedrock geology are often simplified. Classic analytical solutions generally lump or ignore conditions that limit or enhance well productivity along the well screen at the onset of pumping. Numerical solutions can represent well drawdowns in complex geological settings, such as karst systems, more precisely than many analytical solutions by accounting for additional physical processes and avoiding assumptions and simplifications. Suitable numerical tools for flow simulations in karst are discrete pipe‐continuum models that account for various physical processes such as the transient hydraulics of wellbores intersecting highly conductive structures during pumping.

中文翻译：

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与高导电结构相交的井的内部边界条件的近似值

内部边界条件描述了抽水过程中地下水井与周围含水层的相互作用，并与表皮损坏有关，限制了水的生产和井筒储存的水。在即时流量和早期流量期间对井的抽水测试评估要求分配内部边界条件。最初，这些概念是为垂直井筛开发的，后来又转移到与高传导性结构相交的井筒中，例如裂缝性和岩溶性系统中的优先流动区。复杂基岩地质中抽水试验分析的概念模型通常得到简化。经典的分析解决方案通常会在泵送开始时沿井眼筛块限制或提高井的生产率，而这些条件会导致肿块或忽略。通过考虑额外的物理过程并避免假设和简化，数值解决方案可以比许多分析解决方案更精确地表示复杂地质环境（例如岩溶系统）中的井位下降。用于岩溶流动模拟的合适数值工具是离散的管道连续模型，这些模型考虑了各种物理过程，例如在抽水过程中与高导电结构相交的井筒的瞬态水力。