Hydraulic Parameter Identification: Generalized Interpretation Method for Single and Multiple Pumping Tests

Hardcover, xvi + 359 pages, NOT ex-library. Interior is clean and bright throughout, untanned, with unmarked text, free of inscriptions and stamps, firmly bound. Minor external handling wear. Issued without a dust jacket. -- This technical volume presents a specialised numerical framework for identifying hydraulic parameters in layered aquifer systems. Deviating from traditional analytical "type-curve" methods, Lebbe introduces a generalised interpretation method based on the MLU (Multi-Layer Unsteady state) computer program. The methodology treats the subsurface as a complex sandwich of aquifers and aquitards, allowing for the simultaneous processing of drawdown data from multiple pumping and observation wells located in different stratigraphic horizons. The core of the work is the application of the Levenberg-Marquardt nonlinear regression algorithm to minimise the residuals between observed and calculated drawdowns. A distinguishing feature of Lebbe's approach is the rigorous use of sensitivity analysis and correlation matrices to address the non-uniqueness of parameters. By analysing the "identifiability" of hydraulic constants, the text demonstrates how to distinguish between different hydrogeological models and quantify the reliability of estimated values for transmissivity, vertical flow resistance (leakage), and storage coefficients. The book provides practical guidance on interpreting constant-rate, step-drawdown, and recovery tests within leaky, confined, or unconfined systems. It remains a foundational text for hydrogeologists specialising in inverse modelling and is essential for those using numerical codes to characterise heterogeneous, multi-layered groundwater reservoirs.…