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)
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)
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