рекультивация земель(land reclamation, the process of improving lands to make them suitable for a more intensive use. Reclamation efforts may be concerned with the improvement of rainfall-deficient areas by irrigation, the removal of detrimental constituents from salty or alkali lands, the diking and draining of tidal marshes, the smoothing and revegetation of strip-mine spoil areas, and similar activities.
britannica.com)
мелиорация земель(Making land capable of more intensive use by changing its general character, as by drainage of excessively wet land; irrigation of arid or semiarid land; or recovery of submerged land from seas, lakes and rivers; Воздействие на землю в целях повышения интенсивности её использования путем изменения её основных характеристик, напр., в результате дренажа заболоченных участков, ирригации засушливых или полузасушливых земель, восстановления участков, затопленных водами моря, озера или реки)
создание участков суши(Land reclamation is the process of creating new land by raising the elevation of a waterbed or low-lying land or by pumping water out of muddy morass areas. Land reclamation can be achieved by poldering or by raising the elevation of a seabed or riverbed or low-lying land by: dry earth movement; or hydraulic filling. iadc-dredging.comJohnny Bravo)
thefreedictionary.com Alexander Demidov); осушение участков озёр, болот, рек, морей с целью создания на них твёрдых почв (dreamjam); мелиорирование