STUDY OF CLASSIFICATION SYSTEM OF LOESS LANDFORM

The loess landform is one of the important research contents of geomorphology. It has an extensive and important application in the environmental geology, hydrogeology, engineering geology and other subjects. So it has attracted the attention of scholars both at home and abroad for a long time. However, due to the complexity of the distribution, morphology and causes of loess landform, it still does not have an classification system with the peculiarities include systematic, comprehensive and practical. At present many classification and naming of loess landform types are lack of unified definition and specific definition. It caused a lot of confusions and misuses. First, we summarized the research history and causes of loess landform, then summarized the field survey data, at last on the basis of previous work, we try to establish a new set of classification system of loess landform. The principles including combination of causes and forms, systematic, comprehensive, practical and so on was accepted by this classification system. The causes of loess landform include cenozoic tectonic movement(endogenetic agent),geotechnical properties, external agent, the influence of human activity, et al. The old classification system was lack of a lot of types of loess landform. This new classification system adds some types of loess landform to the old system. And the new classification system gives specific connotation to the previous confusing concept of loess landform. At last loess landform is divided into four categories, including Loess erosion-tectonic accumulation landform, Loess modern tectonic(deformation) landform, Loess collapsibility subsidence landform, Loess erosion landform. It has a simple introduction about the four categories in the article. The new classification system not only considers the principles of loess landform classification including comprehensive and systematic, but also takes into account the actual needs of scientific research and production work. So it has more theoretical and practical application value.