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Due to considerable amounts of water from the Rhine flowing through its distributary IJssel into the IJsselmeer, the closed-off bay functions as a large freshwater reservoir, serving as a source for agriculture and drinking water. Outlet sluices in the Afsluitdijk regulate the water level of the IJsselmeer. [citation needed]
It more immediately flows into the east-south channel around the Flevopolder, Flevoland which is kept at 3 metres below sea level. This body of water is then pumped up into the IJsselmeer. It is sometimes called the Gelderse IJssel (IPA: [ˌɣɛldərsə ˈʔɛisəl] ⓘ; "Gueldern IJssel") to distinguish it from the Hollandse IJssel.
The IJsselmeer side of the dam was designed with a lower factor of safety than the Wadden Sea side, as it was anticipated that even under unfavourable conditions, such as a southwest storm over the IJsselmeer with a high average water level, the waves would not exceed about 3.5 metres above Amsterdam Ordnance Datum. Consequently, the berm was ...
The Netherlands has a coastline that is constantly changing with erosion caused by wind and water. The Dutch people inhabiting the region had at first built primitive dikes to protect their settlements from the sea. [1] In the northern parts of the Netherlands sea levels fell exposing new land at a rate of 5–10 meters per year between 500 BC ...
In preparation for this flooding, the water level of the IJsselmeer was deliberately raised. [3] The level in the IJsselmeer was 3.62 m (12 ft) above the ground level of Wieringerpolder at the site of the breach, and varied between 3.12–5.12 metres (10–17 ft) above, across the polder. [4]
The shipping locks at Kornwerderzand, also known as the Lorentzsluizen ("Lorentz Locks"), provide access to the Wadden Sea from the IJsselmeer, and a complex of discharge sluices control the water level in the IJsselmeer.
Observation of wind setup in Vlissingen in 1953. In lakes, wind setup often leads to noticeable fluctuations in water levels.This effect is particularly clear in lakes with well-regulated water levels, such as the IJsselmeer, where the relationship between wind speed, water depth, and fetch length can be accurately measured and observed.
A proposed alternative was to use the lake as a water reservoir for hydropower combined with wind-power from windmills on the dikes, eliminating the unpredictability of the latter – when there is an overcapacity of wind, use that to fill the lake and when there is not enough, use the high water level for hydro power.