نتایج جستجو برای: loess
تعداد نتایج: 3659 فیلتر نتایج به سال:
Non-invasive geophysical imaging of Maori ancestral burial sites (urupa) have allowed us to test when and where geophysical surveys are most likely to succeed. Results from five sites, with both marked and unmarked graves, in three coastal settings along the east coast of the South Island of New Zealand show that burials in clay and silt (loess) can be readily identified using geophysical techn...
The degraded ecosystem in the Loess Plateau region of China is very vulnerable, which has a great impact on regional sustainable development. Taking the Loess Plateau of Yan’an, Shaanxi province, China, as the study area, this study quantitatively evaluated conditions of the ecological environment. Based on natural factors, environmental factors, and socio-economic factors of Yan’an in 1997, 20...
Loess is very widely distributed, and the unsaturated hydraulic conductivity of loess related to many engineering issues. To determine remoulded more conveniently at a lower cost, filter paper test soil column seepage were carried out. The results indicate that in one-dimensional process, increases with increase volumetric water content, as time continues, from top depth 40 cm gradually becomes...
Due to lack of reliable proxies from the Westerlies-dominant region, the strength change of Northern Hemisphere Westerlies remains poorly understood. The aim of this study is to provide a reliable paleoclimatic proxy about the Northern Hemisphere Westerlies change. Here we report a 30.7 m thick loess section from the Ili basin directly controlled by the Westerlies. Based on optically stimulated...
Marine accumulations of terrigenous sediment are widely assumed to accurately record climatic- and tectonic-controlled mountain denudation and play an important role in understanding late Cenozoic mountain uplift and global cooling. Underpinning this is the assumption that the majority of sediment eroded from hinterland orogenic belts is transported to and ultimately stored in marine basins wit...
This study examines the effects of land use and slope angle on runoff, soil loss and nitrogen loss from hillslopes of the Loess Plateau in China. Farmland, wasteland and four forest treatments (sea buckthornþ poplar, immature sea buckthorn, mature sea buckthorn, and immature Chinese pine) were the types of land use that were compared. The results showed that July was the critical period for run...
The extensive Interior Alaska loess deposits record glacial advance and retreat over the past 3 Myrs. Refining our understanding of still-debated origins this will help us refine climate patterns since late Cenozoic. We present here first detrital-zircon ages from Gold Hill loess, a well-studied deposit in Fairbanks, Alaska, as well new local fluvial sediments. describe statistical approach to ...
Eolian loess deposits contain valuable information about past climate changes and erosion history in dust source regions. In contrast to the extensive investigations of paleoclimatic implications Eurasian loess, continental has received less attention, particularly on global or hemispheric scales. The present study combines citrate-bicarbonate-dithionite (CBD) magnetic mineral extraction proced...
Research on the infiltration characteristics of surface water is fundamental for understanding entire hydrological process. Therefore, studying process sandstone slopes overlaid with loess and predicting soil moisture content are great importance investigating processes controlling erosion in hilly gully areas Loess Plateau China. This study mainly focuses simulation vertical movement patterns ...
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