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O. A. C. Hoes
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FLOOD RISK IMPACT OF SPATIAL DEVELOPMENTS, CLIMATE CHANGE AND SUBSIDENCE: CASE STUDY IN THE NETHERLANDS O. A. C. Hoes
Lowland Technology International Vol 9 No 2, Dec (2007)
Publisher : International Association of Lowland Technology

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Abstract

Polder areas are vulnerable for inundations by extreme precipitation, as runoff may temporarily exceed the limited discharge capacity of drainage canals and pumping stations. This type of flooding is not life threatening, but can cause considerable economic damage. Furthermore, it is likely that frequency and damage of this type of flood events will increase in the future. The research question addressed in this paper is whether there is any need to improve water systems with respect to climate change, subsidence and spatial developments. To answer this question the case of the Flevo polder was studied. It will be shown that the risk increase of spatial developments, subsidence and climatechange simultaneously is larger then the sum of the individual risk increase per category.
IDENTIFYING SEEPAGE IN DITCHES AND CANALS IN POLDERS IN THE NETHERLANDS BY DISTRIBUTED TEMPERATURE SENSING O. A. C. Hoes; W. M. J. Luxemburg; M. C. Westhof; N. C. van de Giesen; J. Selker
Lowland Technology International Vol 11 No 2, Dec (2009)
Publisher : International Association of Lowland Technology

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Seepage in ditches and canals, a common feature in polders in The Netherlands, is investigated making use of temperature sensing by fiber optic cable. By its high spatial and temporal resolution capabilities the technique reveals the complex ensemble of all effects that define the water temperature on the bottom of the watercourses in three polders where a 1300 m long cable was located. From the temperature signature the location of suspected seepage zones in the water courses can be determined more precisely. The study shows that the sensing of seepage through temperature is time dependent as the signature can temporarily fade and can be extremely localized. This shows the potential for the applied technique.
Co-Authors J. Selker M. C. Westhof N. C. van de Giesen W. M. J. Luxemburg