喀喇昆仑康西瓦南部向阳峰一带发现石炭纪沉积型铁矿层     

张占武崔建堂  朱海平王炬川 边小卫 《地质通报》2007,26(4):I0004-I0004

中国地质调查局2003—2005年开展的青藏高原北部空白区1∶25万康西瓦幅、恰哈幅、阿克萨依湖幅、岔路口幅区域地质调查项目,在西昆仑康西瓦南部岔路口地区向阳峰一带地质填图工作中发现了石炭纪沉积型铁矿层。该铁矿层位于岔路口幅向阳峰一带的哈巴克达坂—神仙湾兵站简易公路西侧,交通较为便利。  相似文献   

基于ERDAS8．7LPS模块正射影像图的制作     

贾维花吕宜平  张之武 《东北测绘》2007,30(6):39-43

LPS模块是ERDAS公司与Leica公司在原有的IMAGINE OrthoBase基础上进行改进后的产品。LPS将正射的过程进行了流水线式的梳理。本文以航空遥感所获得的数字图像为例，介绍了应用LPS模块进行数字图像正射校正处理的操作流程，并指出制作过程中的注意事项，以期对航空正射影像图的制作具有一定的借鉴作用。  相似文献   

决策气象服务的策略与技巧初探     

李汉彬 于平钟伟雄  巫燕辉 《广西气象》2007,28(A02):151-152,186

从决策气象服务的基本思路入手,结合河源地理、气候特点和在决策气象服务中积累的经验,对发布决策气象服务的策略和技巧进行了初步的探索,力求对今后各种灾害性天气的监测和预警预报服务起到一定的参考作用,从而更好的做好决策气象服务工作,减少气象灾害所带来的损失。  相似文献   

A modification to the Bouwer and Rice method of slug-test analysis for large-diameter, hand-dug wells     

Rupp DE  Selker JS  Simůnek J 《Ground water》2001,39(2):308-314

The Bouwer and Rice method of estimating the saturated hydraulic conductivity (Ks) from slug-test data was evaluated for geometries typical of hand-dug wells. A two-dimensional, radially symmetric and variably saturated, ground water transport model was used to simulate well recovery given a range of well and aquifer geometries and unsaturated soil properties, the latter in terms of the van Genuchten parameters. The standard Bouwer and Rice method, when applied to the modeled recharge rates, underestimated Ks by factors ranging from 1.3 to 5.6, depending on the well geometry and the soil type. The Bouwer and Rice analytical solution was modified to better explain the recovery rates as predicted by the numerical model, which revealed a significant dependence on the unsaturated soil for the shallow and wide geometries that are typical of traditional wells. The modification introduces a new parameter to the Bouwer and Rice analysis that is a measure of soil capillarity which improves the accuracy of Ks estimates by tenfold for the geometries tested.  相似文献   

南非干燥台地风化粒玄岩稀土元素分馏和铈异常特征     

Marsh  JS 陈存俊 《国外地质与勘测》1993,(2):21-25

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Coral skeletal delta(15)N reveals isotopic traces of an agricultural revolution     

Marion GS  Dunbar RB  Mucciarone DA  Kremer JN  Lansing JS  Arthawiguna A 《Marine pollution bulletin》2005,50(9):931-944

This study introduces a new method of tracing the history of nutrient loading in coastal oceans via delta(15)N analysis of organic nitrogen preserved in the skeleton of the massive Porites coral. Four coral cores were collected in Bali, Indonesia, from reefs exposed to high levels of fertilizers in agricultural run-off, from lagoonal corals impacted by sewage, and from a reef located 30 km offshore. Skeletal delta(15)N in the agriculturally exposed coral declined from 10.7+/-0.4 per thousand in 1970-1971, when synthetic fertilizers (-0.8 per thousand+/-0.2 per thousand) were introduced to Bali, to a depleted "anthropogenic" baseline of 3.5 per thousand+/-0.4% in the mid-1990s. delta(15)N values were negatively correlated with rainfall, suggesting that marine delta(15)N lowers during flood-bourn influxes of waste fertilizers. Reef cores exposed to untreated sewage in terrestrial discharge were enriched (7.8 and 7.3+/-0.4 per thousand), while the offshore core reflected background oceanic signals (6.2+/-0.4 per thousand). delta(15)N, N concentration, and C:N systematics indicate that the N isotopic composition of skeletal organic matter was generally well preserved over 30 years. We suggest that skeletal organic delta(15)N can serve as a recorder of past nitrogen sources. In Bali, this tracer suggests that the intensification of Western style agricultural practices since 1970 are contributing to the degradation of coastal coral reefs.  相似文献   

非饱和带水流的测定     

А.И.布达戈夫斯基  E.B.古塞夫  李德美 《地理科学进展》1983,2(2):46-51

一、引言当前确立陆地水资源管理的理论基础具有日益迫切的意义。而土壤水的管理在这个问题中又占有重要的位置。为了解决这个问题,必须有土壤水形成的较完善的模型。这类模型的完善程度取决于非饱和带内水分输送和蒸发(包括散发)这两个问题的研究水平。关于第一个问题,目前研究得还很不够。因为这个问题十分复杂,在这方面的实验工作做得也不多。  相似文献   

新的地球观与海底矿床     

张德斌  星野通平 《地质与勘探》1974,(4)

红海的海底矿床与异常海水的发现,使世人为之一惊.被称为地球上最典型的断裂谷之一的红海,原来与中央海底山脉顶上所见的断裂谷有成因上的关系,也可以说它是包围地球的断裂系统的一部分.总之,可以认为红海同中央海底山脉一样,它也是地幔物质的涌出口.在认为是地幔物质涌出口的红海海底上,能存在着含大量重金属的沉积物,将会对过矢的矿床成因论引起革命了!实质地说,这乃是一个没有大  相似文献   

巷道系统的形状和推进速度对涌水量的影响     

С.  БГ 古明 《国外煤田地质》1991,(1):41-44

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天文奇观：彗星联珠撞木星     

法平 《天文爱好者》1994,(5)

天文奇观：彗星联珠撞木星法平今年７月１７日～２２日发生的苏梅克一利维９号（简称ＳＬ９）慧星与木星联珠撞击，吸引了世界天文学界，全球上百座天文台（站）的数以千计的天文学家作了各种观测，取得了丰硕的成果。据各有关报道，ＳＬ９慧星碎裂的２１块慧核接连与木星...  相似文献