Formation mechanisms of megadunes and lakes in the Badain Jaran Desert, Inner Mongolia

Field observations demonstrate that calc-sinters occurred in the lakes of Badain Jaran Desert. 87Sr/86Sr ratios,14C,δ 13C and mineral com-positions of calc-sinters,and 3He/4He,4He/20Ne,δ 18O,δ D,pH and TDS of water from springs and lakes are analyzed in detail. The results indicate that the lake water is supplied through deep fault zone. The “ker-nel” of stabilized dunes in the Badain Jaran Desert perhaps consists of calc-sinters and calcareous ce-mentation layers. Deep-seated groundwater effuses from this “kernel” and recharges to lakes in desert. Precipitation and snowmelt water from the Qing-hai-Tibet Plateau is fed into the Badain Jaran Desert,Gurinai,Wentougaole and Ejinqi areas through the Xigaze-Langshan Fault zone. The isotopic composi-tions of groundwater in the Alax Plateau are abnor-mal due to the strong evaporation of the Gyaring and Ngoring lake water in the headstream of the Yellow River. Groundwater dissolves dissoluble fractions of rocks during its transportation through the fault zone and flows out of the mouth of spring in the Badan Jaran Desert. The dissoluble fractions are finally de-veloped into calc-sinters and calcareous cementation layers around the spring. Calci-sinters are gradually largened and eventually emerge on the surface of lake water. Eolian sands accumulate on the surfaces of calc-sinters and calcareous cementation layers,and eventually develop into dunes. Invasion of magma causes an increase in the temperature of groundwater within the faults. Groundwater evapora-tion provides water vapor for the formation of humid stabilized dunes during its upwelling. Rhizoconcre-tions found in Yihejigede indicate that the dune was formed and remained immovable 4700 years ago. The height of the megadunes is proportional to thermal quantity carried by the groundwater.     

母亲是水,我是鱼

一天,我在翻看一本书。突然,两句话跃入我的眼帘,鱼说:"你看不见我的泪,因为我在水里。"水说:"我看得见你的泪,因为你在我的心里。"我的心怦然一动,自己不就是鱼,母亲不就是水吗?鱼的一动一静,水都一点一滴地记在心上,只因鱼在水的心里。妈妈总是辛劳地照顾我,我永远都报答不了她的恩情。     

延安市市售纯净水及泉水水质的细菌学检测

用平板培养法及多管发酵法对延安市部分市售纯净水及泉水中的细菌及大肠菌群进行了检测.结果表明:在检测的9个品牌中,桶装纯净水全部合格,瓶装纯净水全部合格,泉水中有一种不合格.     

泉

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横泉水库庄上N2土料场分析

在大量野外勘察取样和室内土工试验的基础上,对横泉水库庄上N2土料场土料的质量与储量进行了分析与评价。     

论山西岩溶泉水及其开发利用问题

本文重点阐述了山西岩溶水的地质地理概况及岩溶水的类型,并分析了泉水污染,盲目扩泉、泉水浪费等现象,进一步提出如何合理地开发利用的问题。     

山西岩溶泉水资源量评价与分析

岩溶地下水是山西城市生活和工业生产的重要水源，80年代以来，山西社会经济发展对岩溶地下水资源需求量与日俱增，同时由于降水量的减少以及岩溶水开采等人类活动影响因素的增加，岩溶泉水流量大幅度减小。采用多种方法对岩溶地下水进行评价。其结果具有较高的可靠性。     

玛纳斯河泉水溢出带地下水变化动态研究

针对玛纳斯河泉水溢出带冬季抽水入库后，自溢泉水锐减的实际问题，运用数理统计方法，分析了泉水溢出带冬季抽水对泉水动态变化的影响及变化规律，建立了泉水与河水之间的回归模型，用方差分析方法进行了回归效果检验，并用ｔ检验法对相关系数进行了统计检验，最后提出了最佳开采利用方案。     

实验室去除临汾市龙子祠泉水挥发酚试验报告

文章根据龙子祠泉水挥发酚超标这一事例,对这一超标现象进行了去除试验,并作了相关报告。     

大泉水库帷幕灌浆除险加固技术

帷幕灌浆是非常重要的基础防渗处理技术措施,在施工过程中必须严格控制各项施工参数,确保工程施工质量,才能消除工程安全隐患,保障水库安全运行。结合大泉水库除险加固工程施工实践,介绍了帷幕灌浆技术的施工工艺流程、主要技术参数选取以及施工质量控制措施等。