Optimisation of sampling is a well known and solved problem in case of a classical mining project. In case of an environmental project, as is the selection of sludge of a drainage channel, the problem looks like more complex. Indeed, the problem is conjugating the selection support dimension, the sampling density, and the estimates precision, with a benefit function which is not anymore the simple cost analysis. In fact it is necessary to give an economic meaning to the cut-off values defined by the local laws, values which vary depending on the element. The paper presents such analysis in the case of a drainage channel of Padana Plane in Northern Italy to be dredged for routine maintenance. The specific question is the choice of mud correct destination among the several solutions available, depending on the element mean values of selection units. The analysis moved from the results of a starting sampling plan, processed by the classical approach of Geostatistics. A critical revision of national and regional regulation on this and similar matters, coupled with the contribution to risk analysis given by the geostatistical approach to estimates, allowed to identify some proposal for a cost function definition, linked to the estimates incertitude. The support effect and other estimating parameters showed to play the expected relevant role. The indeterminateness of actual regulations and the opposed interests between drain administrator and public concern, make more complex the identification of a methodology for sampling plan optimisation. The results put in evidence the need of a clearer UE regulation.

Sampling plan criteria for the bottom mud characterisation of drainage channel

SGALLARI, SERENA;BRUNO, ROBERTO;
2005

Abstract

Optimisation of sampling is a well known and solved problem in case of a classical mining project. In case of an environmental project, as is the selection of sludge of a drainage channel, the problem looks like more complex. Indeed, the problem is conjugating the selection support dimension, the sampling density, and the estimates precision, with a benefit function which is not anymore the simple cost analysis. In fact it is necessary to give an economic meaning to the cut-off values defined by the local laws, values which vary depending on the element. The paper presents such analysis in the case of a drainage channel of Padana Plane in Northern Italy to be dredged for routine maintenance. The specific question is the choice of mud correct destination among the several solutions available, depending on the element mean values of selection units. The analysis moved from the results of a starting sampling plan, processed by the classical approach of Geostatistics. A critical revision of national and regional regulation on this and similar matters, coupled with the contribution to risk analysis given by the geostatistical approach to estimates, allowed to identify some proposal for a cost function definition, linked to the estimates incertitude. The support effect and other estimating parameters showed to play the expected relevant role. The indeterminateness of actual regulations and the opposed interests between drain administrator and public concern, make more complex the identification of a methodology for sampling plan optimisation. The results put in evidence the need of a clearer UE regulation.
2005
Geostatistics for Environmental Applications
S.Sgallari; R.Bruno; C.Zampighi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/25471
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