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The effective subsidence capacity concept: How to assure that subsidence in the Wadden Sea remains within defined limits?

Published online by Cambridge University Press:  24 March 2014

J.A. de Waal ,
J.P.A. Roest ,
P.A. Fokker ,
I.C. Kroon ,
J.N. Breunese ,
A.G. Muntendam-Bos ,
A.P. Oost  and
G. van Wirdum
J.A. de Waal*
Affiliation:
State Supervision of Mines, Henri Faasdreef 312, PO Box 24037, 2490 AA The Hague, the Netherlands
J.P.A. Roest
Affiliation:
State Supervision of Mines, Henri Faasdreef 312, PO Box 24037, 2490 AA The Hague, the Netherlands
P.A. Fokker
Affiliation:
TNO – Geological Survey of the Netherlands; Princetonlaan 6, 3584 CB Utrecht, PO Box 80015, 3508 TA Utrecht, the Netherlands
I.C. Kroon
Affiliation:
TNO – Geological Survey of the Netherlands; Princetonlaan 6, 3584 CB Utrecht, PO Box 80015, 3508 TA Utrecht, the Netherlands
J.N. Breunese
Affiliation:
TNO – Geological Survey of the Netherlands; Princetonlaan 6, 3584 CB Utrecht, PO Box 80015, 3508 TA Utrecht, the Netherlands
A.G. Muntendam-Bos
Affiliation:
TNO – Geological Survey of the Netherlands; Princetonlaan 6, 3584 CB Utrecht, PO Box 80015, 3508 TA Utrecht, the Netherlands
A.P. Oost
Affiliation:
Deltares, Princetonlaan 6, 3584 CB Utrecht, PO Box 85467, 3508 AL Utrecht, the Netherlands
G. van Wirdum
Affiliation:
Deltares, Princetonlaan 6, 3584 CB Utrecht, PO Box 85467, 3508 AL Utrecht, the Netherlands
*
*Email: j.a.dewaal@mineleni.nl.
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Abstract

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Subsidence caused by extraction of hydrocarbons and solution salt mining is a sensitive issue in the Netherlands. An extensive legal, technical and organisational framework is in place to ensure a high probability that such subsidence will stay within predefined limits. The key question is: how much subsidence is acceptable and at which rate? And: how can it be reliably assured that (future) subsidence will stay within these limits?

To address the issue for the Wadden Sea area, the concept of ‘effective subsidence capacity’ is used. To determine the ‘effective subsidence capacity’, the maximum volumetric rate of relative sea-level rise, that can be accommodated in the long term, without environmental harm, is established first. The volume of sediment that can be transported and deposited by nature into the tidal basin where the subsidence is expected, ultimately determines this ‘limit of acceptable average subsidence rate’. The capability of the tidal basins to ‘capture’ sediment over the lunar cycle period of 18.6 years is the overall rate-determining step. Effective subsidence capacity is then the maximum average subsidence rate available for planning of human activities. It is obtained by subtracting the subsidence volume rate ‘consumed’ by natural relative subsidence in the area (sealevel rise plus natural shallow compaction) from the total long-term acceptable subsidence volume rate limit.

In the operational procedure for mining companies, six-years-average expectation values of subsidence rates are used to calculate the maximum allowable production rates. This is done under the provision that production will be reduced or halted if the expected or actual subsidence rate (natural + man induced) is likely to exceed the limit of acceptable subsidence. Monitoring and management schemes ensure that predicted (6-year average) and actual (18.6-year average) subsidence rates stay within the limit of acceptable subsidence rate and that no damage is caused to the protected nature. A GPS based early warning system is used for early detection of unexpected behaviour. In support of SSM (State Supervision of Mines, the government regulator), TNO-AGE (an independent government advisory group) applies an independent Bayesian statistical analysis of all data, as they become available, to calculate the probability of scenario's under which future subsidence will exceed the defined limits. It is external to the operator's annual measurement and control loop and ensures that preventive actions can be taken in time in case such scenarios emerge.

Regular communication keeps the authorities and the general public informed on the use of the effective subsidence capacity to demonstrate that the actual average subsidence rate stays strictly within the defined bounds and that, from a scientific point of view, there is no reasonable doubt that damage to the tidal system will not occur now or in the future.

Keywords

effective subsidence capacitygas productionlimit of acceptable subsidencesubsidence management
Type
Research Article
Information
Netherlands Journal of Geosciences , Volume 91 , Issue 3 , November 2012 , pp. 385 - 399
Copyright
Copyright © Stichting Netherlands Journal of Geosciences 2012

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