期刊名称：Cuadernos de Investigación Geográfica = Geographical Research Letters
印刷版ISSN：0211-6820
电子版ISSN：1697-9540
出版年度：2011
卷号：37
期号：1
页码：7-23
DOI：10.18172/cig.1243
出版社：Universidad de La Rioja
摘要：The papers referred to the development of piping processes in Spain are reviewed. Most of papers are focused on semi-arid environments of the Ebro Depression and South-East Spain, where large collapses occur favouring the evolution of gullies. In many cases, piping is related to the presence of badlands. Piping is particularly relevant on soils and poorly consolidated materials on soft rocks (marls and lutites), with abundant expansive clays and high sodium content. The existence of strong hydraulic gradients (linked to bench-terracing of cultivated soils, or to gully incision) is a necessary factor. Many of the problems related to piping are generated in old cultivated fields or even in irrigated fields. In mountain areas the presence of subsurface drainage networks has been cited as a consequence of the presence of micro-mammals burrowing or dead roots, though they do not lead to the development of badlands.
关键词：Piping; Sub-superficial drainage; badlands; gullies; land abandonment
