Terrace

Terrace
Name	Terrace

Terrace

Lead: A terrace is a stepped or leveled surface formed or constructed for human use and environmental management across diverse contexts. Terraces appear in agricultural, architectural, geomorphological, and archaeological records, intersecting with sites, cultures, engineering works, and natural processes associated with rivers, coasts, and mountains. Studies of terraces connect to research at institutions, field sites, and heritage organizations worldwide.

Definition and Types

A terrace may denote an agricultural agricultural terrace, an escarpment-related river terrace, a marine terrace, a benched slope in open-pit mining, or a building terrace such as a roof garden or terrace house platform near sites like Pompeii, Machu Picchu, Angkor Wat, Petra, and Chichén Itzá. Types include in situ strath terrace and fill terrace classifications used in studies at University of Cambridge, University of Oxford, University of California, Berkeley, University of Tokyo, and National Autonomous University of Mexico. Related engineered forms are found in rice terraces of the Philippines, China, and Peru, and in vineyard terraces in France, Italy, Spain, and Portugal.

History and Cultural Significance

Terraces are central to histories of settlement and landscape modification documented by archaeologists working at Çatalhöyük, Çeşme, Banpo, Willandra Lakes, Nazca Lines, and Göbekli Tepe. Terraced agriculture underpinned empires including the Inca Empire, the Aztec Empire, the Song dynasty, and the Ottoman Empire, and features in chronicles at institutions such as the British Museum, the Smithsonian Institution, the Louvre, and the Metropolitan Museum of Art. Cultural heritage designations by UNESCO and preservation projects by ICOMOS and World Monuments Fund highlight terrace sites like Qhapaq Ñan and the Rice Terraces of the Philippine Cordilleras. Ethnographic studies conducted by researchers at Harvard University, Yale University, University of Chicago, and Australian National University document terrace-based rituals tied to festivals such as Inti Raymi, Obon, and Loy Krathong.

Terrace Agriculture and Irrigation

Terraced agriculture maximizes arable area and controls hydrology through features like check dams, contour bunding, retaining walls, and irrigation channels tied to systems studied by FAO, CGIAR, International Rice Research Institute, and World Bank programs. Examples include Ifugao Rice Terraces, Longji Rice Terraces, and Colca Valley cultivation, with agronomic research at CIMMYT, IRRI, ICRISAT, and University of California, Davis addressing crop yields, soil fertility, and water management. Irrigation technologies associated with terraces include qanat systems in Persia, acequia canals in Spain, gravity-fed aqueducts of Rome, and khadin practices in Saurashtra. Sustainable agriculture initiatives by Conservation International, WWF, and United Nations Environment Programme incorporate terrace restoration in climate adaptation plans promoted at COP negotiations.

Architectural Terraces and Landscaping

Architectural terraces occur in Roman architecture, Islamic gardens, Mughal gardens, Renaissance palazzi, and Modernist works by architects like Le Corbusier, Frank Lloyd Wright, and Luis Barragán. Terraced promenades and plazas appear in urban projects in Paris, Venice, Barcelona, Istanbul, and New York City, with landscape design by firms associated with Royal Horticultural Society, American Society of Landscape Architects, and projects at Kew Gardens. Structural engineering for terraces involves materials and techniques taught at Massachusetts Institute of Technology, Delft University of Technology, and ETH Zurich, linking to standards by ISO and building codes administered by agencies like Building Research Establishment and International Code Council.

Geological and Geomorphological Terraces

Geological terraces include fluvial terraces, marine terraces, and piedmont benches formed by tectonics, sea-level change, and climate cycles recorded in stratigraphic studies by U.S. Geological Survey, British Geological Survey, Geological Survey of India, and research at Scripps Institution of Oceanography. Terraces preserved along coasts of California, New Zealand, Japan, Chile, and Greece provide sea-level markers used in studies by National Oceanic and Atmospheric Administration, IPCC, and Paleoclimatology groups. Paleoseismological investigations at sites like San Andreas Fault, Haiyuan Fault, and Altyn Tagh Fault use terrace offsets to date earthquakes, and geomorphologists at Stanford University, University of Arizona, and ETH Zurich model terrace formation processes.

Environmental Impact and Conservation

Terrace construction and abandonment influence erosion rates, sediment delivery to watersheds, biodiversity in riparian zones, and carbon sequestration assessed by IPCC reports and conservation bodies like IUCN. Restoration projects by The Nature Conservancy, FAO, and national parks such as Yellowstone National Park and Banff National Park include terraced landscape rehabilitation to reduce landslide risk and support species protected under conventions like the Convention on Biological Diversity and Ramsar Convention. Conservation funding and policy involvement by European Commission, USAID, UNDP, and heritage agencies including Historic England and National Park Service support community-based management of terrace systems.

Category:Landforms