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Using methods of sedimentary and geochemistry, this paper analyzed the sedimentary environment in the Majiagou Formation. It suggests that Member 1, Member 3 and Member 5 are characterized by a dry and hot climate as well as fall of the sea level. The area of Well Longtan 1 in the eastern basin is abundant of platform evaporites with the depositional anhydrite and salt rock, surrounded by a suite of dolomite intercalated by the thin layers of anhydrite from the anhydrite\|dolomite platform sediment. It deposits muddy dolomite, dolomitic limestone and fine\|grained dolomite in the limestone-dolomite platform and restricted sea.

运用沉积学与地球化学方法，分析了研究区马家沟组的沉积环境，认为：马一段、马三段和马五段沉积时期气候干热，海平面下降，盆地东部龙探1井区一带主要为台地蒸发岩相沉积，发育了膏盐岩和盐岩沉积，其周边则发育了一套白云岩夹薄层硬石膏岩的含膏云坪相沉积，在盆地东部周边地区主要沉积了泥质白云岩、白云质灰岩和细晶白云岩的云灰坪和局限海相沉积。

The analyses of environmental indexes of the sediment from a 5.3m core, CE-2 core, taken from Co Ngoin lake, reveals the process of climate change in the central Tibetan Plateau during 12~4kaBP, shown as cold and wet period (before 11.2kaBP)→Allerod period (11.2～10.9kaBP)→Younger Dryas (10.9～10.5kaBP)→warm and wet period (Holocene, after 10.5kaBP).

通过CE-2孔5.3m湖泊沉积物高分辨率多指标综合研究，获得了高原中部12kaBP以来详细的气候环境演化过程：11.2kaBP前的冷湿阶段-阿勒罗德期(11.2～10.9kaBP)-新仙女木期(10.9～10.5kaBP)-全新世暖湿期(10.5kaBP后)。

The analyses of environmental indexes of the sediment from a 5.3m core, CE-2 core, taken from Co Ngoin lake, reveals the process of climate change in the central Tibetan Plateau during 124kaBP, shown as cold and wet period (before 11.2kaBP)→Allerod period (11.2～10.9kaBP)→Younger Dryas (10.9～10.5kaBP)→warm and wet period (Holocene, after 10.5kaBP).

更多综合研究，获得了高原中部12kaBP以来详细的气候环境演化过程：11.2kaBP前的冷湿阶段-阿勒罗德期(11.2～10.9kaBP)-新仙女木期(10.9～10.5kaBP)-全新世暖湿期(10.5kaBP后)。

It is made up of two excluding each other ichnocoenosis, namely epibenthic and endobenthic ichnocoenosis; The third one is quite monotony in fossil types, mainly of trails left behind by sediment-eating or detrital-eating animals grazing or feeding along the surfacial layer or on the surface of the sediments.

包括两个相互排斥的群落，底表生物遗迹群落和底内生物遗迹群落；第三个遗迹组合类别十分单调，主要为食沉积物或食碎屑性动物沿沉积物表面或表层牧食或觅食过程中留下的痕迹。

According to the J_2~2～J~1 strati- graphic features, rock facies characteristics and previous research, the author deem that the terrestrial environment spread all over the epicontinental sea-platform at the transgression time when the J_1 depositing, the environment character is the normal sea-platform sedimentary; the study results indicate that the location-evaporation platform environment when theJ_2~～J~1 sediment is good to the reservoir formatting and evaluating.

研究认为在嘉二~1～嘉二~2段时期沉积所处的局限—蒸发台地环境属于较有利于储层形成与演化的沉积相带；嘉一段沉积相平面展布主要形成于开阔台地环境中，属于不利于储层形成与演化的沉积相带。

Key words: tidal estuary;erodible soft foundation;movable－bed test;starting velocity;sediment balanced transport

关键 词：感潮河口；软基冲刷；动床冲刷试验；起动流速；输沙平衡

When the erodible velocity was greater than the velocity that sediment started to move, the soil samples with burrows were easier erosion than the soil Samples without burrows.

当冲刷流速大于土样泥沙起动流速时，有生物洞穴扰动的土样比无生物洞穴扰动土样更容易被冲刷。

In this paper,the erosional and depositional stability of the Lanjiang sand bar in the Longkou Bay is studied by making a comparison between water depth data in different periods,and the erosion and deposition mechanisms of the Lanjiang sand bar are discussed by analyzing the formation process of sand bar and the sediment movement around sand bar.

通过不同时期的水深对比对龙口湾拦江沙坝的稳定性进行研究，从其形成过程和现代泥沙运动的角度对拦江沙坝冲淤变化的机制进行探讨。

Results are as following:The causes of grassland desertification of Hulunbeir are the outcome of interaction of nature and the human beings. Among these reasons, the loose soil texture, which was formed in the fluviolacustrine sediment during Quaternary, establish the physical ground, and the drought and wind is the natural force of grassland desertification. And then over-cutting forest, over-grazing grassland, imbalance of resource utilization and estrepement reduce the coverage of vegetation, therefore provide necessary conditions for the grassland desertification.

其中，形成于第四纪河湖相沉积沙的疏松土壤母质，为日后土壤风蚀奠定了深厚的物质基础；干旱多风的气候条件构成了草地风蚀沙化的自然营运力；而人为过度砍伐沙地林木资源、沙质草地长期超载放牧、资源利用不平衡以及乱垦、滥挖等不合理经济行为，又降低了沙化草地植被覆盖度，为草地风蚀沙化提供了必要条件。

Considering that tides are composed of various constituent, the paper here carries on the study on the changes of sediment concentration in estuarial region by means of harmonic analysis method of tides.

同时潮汐是由一个个分潮组成的，所以可以通过调和分析的手段对河口地区的含沙量的变化规律进行研究。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。