Question: The Veerse Meer was separated from the North Sea by a series of what?

Context paragraphs:
North Sea Wind Power Hub: North Sea Wind Power Hub is a proposed energy island complex to be built in the middle of the North Sea as part of a European system for sustainable electricity.  One or more “Power Link” artificial islands will be created at the northeast end of the Dogger Bank, a relatively shallow area in the North Sea, just outside the continental shelf of the United Kingdom and near the point where the borders between the territorial waters of Netherlands, Germany, and Denmark come together.  Dutch, German, and Danish electrical grid operators are cooperating in this project to help develop a cluster of offshore wind parks with a capacity of several gigawatts, with interconnections to the North Sea countries.  Undersea cables will make international trade in electricity possible.

Geology of southern North Sea: The North Sea basin is located in NE Europe and lies between the United Kingdom, and Norway just north of The Netherlands and can be divided into many sub-basins.  The Southern North Sea basin is the largest gas producing basin in the UK continental shelf, with production coming from the lower Permian sandstones which are sealed by the upper Zechstein salt.  The evolution of the North Sea basin occurred through multiple stages throughout the geologic timeline.  First the creation of the Sub-Cambrian peneplain, followed by the Caledonian Orogeny in the late Silurian and early Devonian.  Rift phases occurred in the late Paleozoic and early Mesozoic which allowed the opening of the NE Atlantic.  Differential uplift occurred in the late Paleogene and Neogene.  The geology of the Southern North Sea basin has a complex history of basinal subsidence that had occurred in the Paleozoic, Mesozoic, and Cenozoic.  Uplift events occurred which were then followed by crustal extension which allowed rocks to become folded and faulted late in the Paleozoic.  Tectonic movements allowed for halokinesis to occur with more uplift in the Mesozoic followed by a major phase of inversion occurred in the Cenozoic affecting many basins in NW Europe.  The overall saucer-shaped geometry of the southern North Sea Basin indicates that the major faults have not been actively controlling sediment distribution.

Delta Works: The Delta Works (Dutch: "Deltawerken" ) is a series of construction projects in the southwest of the Netherlands to protect a large area of land around the Rhine-Meuse-Scheldt delta from the sea.  The works consist of dams, sluices, locks, dykes, levees, and storm surge barriers.  The aim of the dams, sluices, and storm surge barriers was to shorten the Dutch coastline, thus reducing the number of dikes that had to be raised.

Voorne-Putten: Voorne-Putten is an island between the North Sea, the Brielse meer and the rivers Oude Maas, Spui and Haringvliet in the province of South Holland in the Netherlands.  Voorne-Putten consists of the two former islands Voorne (the larger, western part) and Putten (the smaller, eastern part).  It used to be separated by the river Bernisse which silted up and made the two islands one.  It has 160,000 inhabitants (2008).  Recently the riverbed has been dredged, and the two islands have been reformed.

History of the North Sea: The North Sea, though often an area of conflict, has an extensive history of maritime commerce and trade routes between its coastal nations whose economies and industries were also able to exploit its resources.  The earliest records of Roman explorations of the sea begin in 12 BC.  Southern Britain was formally invaded in 43 AD and gradually assimilated into the Roman Empire, beginning sustained trade across the North Sea and the English Channel.  The Germanic Angles, Saxons, and Jutes began the next great migration across the North Sea during the Migration Period, conquering, displacing, and mixing with the native Celtic populations.  The Viking Age began in 793 and for the next two centuries the Vikings ruled the North Sea.

Midden-Zeeland Airport: Midden-Zeeland Airport (ICAO: EHMZ) , also known as Zeeland Airport, is an airport located 5 NM east northeast of Middelburg, Zeeland in the Netherlands, just south of the Veerse Meer lagoon.  The airfield is uncontrolled and has a single grass runway of 1000 m long in the 09/27 direction, with a displaced threshold of 200 m for the 09 direction.  It was founded in 1968 and officially opened in 1970.

Veerse Meer: The Veerse Meer (Lake Veere) is a lagoon in the province of Zeeland, the Netherlands.  It was separated from the North Sea in 1961 by the Delta Works dam system.

North Sea Region Programme: The North Sea Region Programme 2007–2013 supports transnational regional development projects connecting regions from seven countries around the North Sea.  It is part of the European Territorial Cooperation Objective under the European Regional Development Fund (ERDF) initiated by the European Union and the European Commission.  The aim of the North Sea Region Programme is "to make the North Sea Region a better place to live, work and invest in".

List of oil and gas fields of the North Sea: This list of oil and gas fields of the North Sea contains links to oil and natural gas reservoirs beneath the North Sea.  In terms of the oil industry, "North Sea oil" often refers to a larger geographical set, including areas such as the Norwegian Sea and the UK "Atlantic Margin" (west of Shetland) which are not, strictly speaking, part of the North Sea.

Veerse Gat: The Veerse Gat or Veeregat was the sea channel between Walcheren and Noord-Beveland islands in Zeeland in the Netherlands.  In 1961 as part of the Delta Plan it was blocked off and made into an inland lake called Veerse Meer.

Supporting paragraphs: Veerse Meer Delta Works
Answer: construction projects