Quantitatively determining the sources of dune sand is one of the problems necessarily and urgently to be solved in aeolian landforms and desertification research. Based on the granulometric data of s
KARST, the Chinese SKA concept, consists of some 30 individual FAST-type elements to be set up in a karst region of Guizhou Province. A crucial question is how to select 30 optimized sites from hundre
根据山地研究现状和相关学科发展,提出山地系统科学概念、科学问题、研究方法,建立山地系统科学的框架.山地系统科学,以地球系统科学理论作为理论指导,以"3S"集成等新方法和技术体系为支撑,从时间序列、空间结构、动态过程和耦合关系等多维度入手,对山地系统的动态过程、演变规律、形成机制、耦合关系等展开全方位的研究.从时间序列上,重点研究不同时期自然及人为作用下山地系统的环境演变与山地资源灾害的时空响应机理
介绍了Unigraphics(UG)软件的主要建模特点,结合利用CAD软件建立标准零件库的一般原则,介绍了几种基于UG建立标准零件库的方法,以及建模需要注意的问题,对利用该软件进行设计的工程人员,有一定的参考意义。
The purpose of this article is to identify the effect of land use pattern on rainfall runoff and runoff sediment relations in Zichang Watershed of the Loess Plateau. From 1986 to 1997, many farmlan
The applicability of a non-point source pollution model—SWAT(soil and water assessment tools) in a large river basin with high sediment runoff modulus(770 t/km2 in the Yellow River) was examined. The
The large-scale upper circulations and merid-ional overturning in the upper layer of the South China Sea (SCS) with idealized bottom topography in winter and sum-mer are investigated. Simulations with
With the aid of the Remote Sensing (RS) and Geographic Information System (GIS) technology, the eco-system pattern and fragility distribution maps of the 50-km-wide zone along the Qinghai-Tibet Railwa
Regional decadal precipitation reconstructions for the arid and semi-arid zones of northern China were established by the use of different palaeoclimate archives such as ice-cores, tree-rings, lake se
The topography data of the Zengmu Shoal and its adjacent area are acquired by the SeaBat-8111 multibeam system. The full survey covering over the Zengmu Shoal area gives us new knowledge about the ar