Where have I been?
In addition to attending fascinating lectures at both the research institute (Deltares), and the Technical University of Delft, I have had the opportunity to go on some great field trips as a part of my research here. More photos to come but uploading photos takes a a while. Big shout and thank you to Ayres River Blog--my fancy shock-proof camera came from their raffle competition.
Maeslantkering at Hoek van Holland
The Maeslantkering at Hoek van Holland
The bottom tube is 6 meters in diameter. These are the arms are hallow, and once they pivot out to close, the arms are filled with water to sink the barrier to the bottom of the channel. That’s me standing in front.
I snuck under the barrier to get this photo. Note that except when closed, this gate and arm remain parked on land. They are then pivoted into place for the closure.
Hondsbroeksche Pleij (first completed Room for River Project near Westervoort)
Weir at Hondsbroeksche Pleij… each gate is manually removed when necessary and this structure directs water into a bypass channel around the Ijssel (photo credit: Almar Joling)
Photo credit: Almar Joling
Houses elevated to get a view of the river over the new dike… (I like to think it’s to reduce damages for when the dike overtops, but I was assured this was not the case)… (Photo credit: Almar Joling)
(more) Riverine parts of the Country
Sluice gates that will drain the water back into the river (when Gorinchem, the low-lying town behind them is flooded)
High water mark (the cow) at Ochten, where the Rhine nearly burst the banks in the 1993 and 1995 floodsOpened summer dike on the River Waal. (Concept: a dike that confines the river channel only during the summer months with lower river flows. Opening the dike in the winter allows the river to spread out onto the full floodplain and reduces water elevations in the main channel). Thus, as long as water is still flowing it, it means that water on the left side (summer channel) is higher than water on the right.
Opened summer dike on the River Waal. (Concept: a dike that confines the river channel only during the summer months with lower river flows. Opening the dike in the winter allows the river to spread out onto the full floodplain and reduces water elevations in the main channel).
More to come…
On the sea dikes in Fryslan. Great technical field trip and clear day with the Wetterskip (water board) and an engineer from Infram
Emergency stockpiles for flood fighting (sea dike is on the right). Fryslan. (Image credit: Jessica Ludy)
Part of the Building With Nature Program to use coastal processes to nourish the dikes while creating a wildlife area.
My helicopter wasn’t available this day, so it’s a picture of a picture.
Quick sand on the sand motor. (well, it seemed like quick sand)
Often when you see such a well-defined curve in the dike, it is due to a former breach. Image: Jessica Ludy