低碳是人类地球球籍新护照     

刘德镒  胡秋君 《国土资源导刊(湖南)》2010,7(4):35-35

我们任何耗竭、浪费矿产资源的行为,都意味着侵犯子孙后代的利益。人类社会在这方面应当有危机感和忧患感。  相似文献   

舟曲:“陇上江南”因何成泥城     

刘德镒  喻刻 《国土资源导刊(湖南)》2010,7(9)

舟曲是长江上游著名的滑坡、泥石流多发区。阳坡陡峻,山大沟深,地层破碎,有利于降雨的迅速汇集,为滑坡、泥石流提供了有利的地貌条件。  相似文献   

Fast clogging problem of open check dams and a new type suggestion:curved footed type open check dam     

AN?LAN Tu??e  AK?AL? Emre 《山地科学学报》2023,(5):1201-1219

Driftwood is one of the important physical components in mountainous rivers which causes severe hazards due to the clogging of bridges, culverts,and narrow sections during floods. Therefore, the understanding of driftwood dynamics and mitigation measures are crucial for managing wood in rivers.Open check dams are the most commonly used engineering measure for preventing driftwood from reaching downstream areas. Nevertheless, these open check dams frequently lose their sediment transport function...  相似文献   

科威特沙漠风成沉积物与气侯,土壤和植被的关系     

AL－N.  GA  周纪侠 《世界沙漠研究》1989,(2):8-13

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湖南下二叠统海泡石及其主要伴生粘土矿物的扫描电镜研究          下载免费PDF全文

刘德镒 《沉积与特提斯地质》1990,10(1):46-55

海泡石是一种富镁的纤维状粘土矿物,为链-层状结构的含水硅酸盐。在自然界中分布不广,很少形成单独的大量堆积。但是因为它具有一系列有别于其他粘土矿物的极其有用的物理化学性能,因此,有着广泛的工业用途。海泡石的成因大体分为两类,一是热液蚀变产物,常呈纤维状或“石棉”状,集合成脉状产出,规模较小,工业意义不大。另一类为沉积成因(包括成岩作用或新生作用而成),往往成为土状海泡石粘土,集合成层状、似层状或透镜状产出,规模一般较大,工业矿床多属此类成因。中国的海泡石粘土矿床都分布在中国南方,而且主要集中在下二叠统,其中湖南约占80％,所以被誉为“海泡石之乡”。在我国“科学的春天”里,湖南有关野外队先后发现了四个矿床和十来个矿点或矿化点。湖南地质研究所参加了地质矿产部“七五”期间重点攻  相似文献   

会“开花”的石头 会找矿的“花朵”     

李文君  段中满  刘德镒 《湖南地质》2009,(3):87-89

岩石也会“开出”艳丽的花朵。当岩石中有向三度空间放射生长的矿物晶体时，无论把岩石从什么方向剖开，只要断面经过矿物晶体，都会在岩石断面上出现花朵般的图案。如果矿物晶体呈柱状，“花瓣”则又细又长，图案好似菊花；如果矿物晶体呈片状，“花瓣”则短而胖，“花朵”就如同攻瑰花。  相似文献   

Striped weakfish (Cynoscion guatucupa): a biomonitor of organochlorine pesticides in estuarine and near-coastal zones     

Lanfranchi AL  Menone ML  Miglioranza KS  Janiot LJ  Aizpún JE  Moreno VJ 《Marine pollution bulletin》2006,52(1):74-80

The general goal of this study was to investigate the role of Cynoscion guatucupa as a biomonitor of organochlorine pesticides (OCP) contamination in Bahía Blanca estuary. Thus, we evaluated whether or not OCP fish distribution pattern reflects the OCP land sources, and if size-related bioaccumulation and biomagnification of these contaminants does occur by comparing different tissues of juvenile and adults of C. guatucupa (Cuvier, 1830). Size-related bioaccumulation in C. guatucupa was observed and it was more important for the more lipophilic and biomagnifying OCP, being determined over time by diet influence. Endosulfan sulfate, chlordanes, HCH isomers and DDT compounds predominated in tissues and ingested food of C. guatucupa, being alpha-chlordane, heptachlor and p,p'-DDE highly bioaccumulated and biomagnificated. Our findings also showed that male adults of C. guatucupa are biomonitors of OCP pollution so we propose this species for further investigations in other coastal zones of South America.  相似文献   

Polychlorinated biphenyls and organochlorine pesticides in Baltic herring 1985-2002     

Pikkarainen AL  Parmanne R 《Marine pollution bulletin》2006,52(10):1304-1309

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Development of saline ground water through transpiration of sea water   总被引：2，自引：0，他引：2  

Fass T  Cook PG  Stieglitz T  Herczeg AL 《Ground water》2007,45(6):703-710

As vegetation usually excludes salt during water uptake, transpiration will increase the salinity of the residual water. If the source water is sea water, then the residual water may become highly saline. In the unconfined coastal aquifer of the tropical Burdekin River delta, northeastern Australia, areas of highly saline ground water with chloride concentrations up to almost three times that of sea water occur up to 15 km from the present coastline, and are attributed to transpiration by mangrove vegetation during periods of high sea level. Radiogenic ((14)C) carbon isotope analyses indicate that ground water with chloride concentrations between 15,000 and 35,000 mg/L is mostly between 4000 and 6000 years old, at which time sea level was 2 to 3 m higher than present. Stable isotope analyses of oxygen-18 and deuterium show no evidence for evaporative enrichment of this water. Oxygen-18, deuterium, and stable (delta(13)C) carbon isotope analyses of ground water and soil water point to a recharge environment beneath the mangrove forests during this postglacial sea level high stand. During that period, transpiration of the mangrove forests would have led to high chloride concentrations in the residual ground water, without inducing isotopic fractionation. Due to the higher density, this hypersaline water moved downward through the aquifer by gravity and has formed lenses of highly saline ground water at the bottom of the unconfined aquifer.  相似文献   

山崩地裂警报——湖南地质灾害防治启示录：写在第40个“世界地球日”     

毛硕  陈娟  刘德镒 《湖南地质》2009,(4):16-18

地震、滑坡、泥石流、崩塌、地裂……所有这些地质灾害现象，都成为困扰人类繁衍生息的自然杀手。在“4·22”地球日到来之际，我们再次关注地质灾害防治工作，在梳理各种地质灾害类型及地质环境保护案例中，进行一次人与大自然和谐共处的科普之旅——  相似文献