"Investigating the impact of the properties of pilot points on calibrat" by Dua K. Klaas and Monzur A. Imteaz
 

Investigating the impact of the properties of pilot points on calibration of groundwater models: case study of a karst catchment in Rote Island, Indonesia

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Publication Date

January 2017

Abstract

A robust configuration of pilot points in the parameterisation step of a model is crucial to accurately obtain a satisfactory model performance. However, the recommendations provided by the majority of recent researchers on pilot-point use are considered somewhat impractical. In this study, a practical approach is proposed for using pilot-point properties (i.e. number, distance and distribution method) in the calibration step of a groundwater model. For the first time, the relative distance–area ratio (d/A) and head-zonation-based (HZB) method are introduced, to assign pilot points into the model domain by incorporating a user-friendly zone ratio. This study provides some insights into the trade-off between maximising and restricting the number of pilot points, and offers a relative basis for selecting the pilot-point properties and distribution method in the development of a physically based groundwater model. The grid-based (GB) method is found to perform comparably better than the HZB method in terms of model performance and computational time. When using the GB method, this study recommends a distance–area ratio of 0.05, a distance–x-grid length ratio (d/X grid) of 0.10, and a distance–y-grid length ratio (d/Y grid) of 0.20.

Keywords

Groundwater Modelling, Parameter Estimation, Geostatistics, Pilot Point, Indonesia

Document Type

Article

Language

English

Notes

Hydrogeology Journal, Vol. 25, no. 6 (2017).

Identifier

SFS0073329_00001

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