Assignment of groundwater level at the wastewater collecting pipe for a landfill groundwater simulation: utilization of the two-dimensional saturated–unsaturated groundwater numerical model     

Thuong Huyen Dang  Kenji Jinno  Atsushi Tsutsumi 《Environmental Earth Sciences》2010,60(8):1575-1582

In order to understand the effects of a landfill operation on groundwater flow behavior, a 2D horizontal groundwater simulation model was carried out. The model saved the memory of computer and time consumption, comparing it with the 3D groundwater flow model. However, the greatest difficulty is the assignment of the collecting pipe boundary at the study site. Therefore, a 2D vertical model was applied to calculate the change of the groundwater table above the collecting pipe. This paper focuses on examining the validation of the assignment of the collecting pipe boundary by applying the results of the 2D vertical model. The 2D horizontal model was coupled with the recharge model to solve the partial differential equation of groundwater flow. The finite difference method and iterative successive over relaxation were applied. The drainage volume of leachate collection was summed up in the whole landfill site and compared with the average volume of treated wastewater. The study demonstrated that the results of the 2D vertical model validated and can be applied to the 2D horizontal groundwater flow simulation.  相似文献   

个旧锡矿33号矿群地质特征与其外围找矿方向   总被引：1，自引：1，他引：1  

秦德先  田毓龙  朱大明  陈宗全  党玉涛  童祥  李玉新  武俊德 《矿物学报》2001,21(4):591-595

个旧锡矿区是老矿区，开采历史悠久，目前资源紧张，急需开展找矿增储研究。33号矿群是近年新勘查的矿体，以接触交代矿床为主，经工程揭露，现已探明一定锡储量，目前矿山生产急需向外围找矿，以期扩大储量，但苦于找矿工程方向不清。我们通过对隐伏花岗岩体形态，锡、铜的矿化强度模型，地表地球化学结合地质研究，指出33号矿群的北东，芦塘坝断裂与炸药库断裂交截部位附近为最有利的找矿空间。  相似文献   

GIS在中国粮食单产空间变化研究中的应用   总被引：8，自引：0，他引：8  

党安荣  阎守邕  王世新 《地理科学》1999,19(3):205-210

依据１９８５与１９９４年两个年份的分县粮食生产统计数据,运用ＧＩＳ为分析手段,从空间变化特征、变化成因及变化趋势三个方面,着重对１９８４年以来我国粮食单产的空间变化进行了定量研究。结果表明：在过去十年里,我国粮食单产增长占绝对优势,其中北方地区增产强度较大、南方地区下滑现象明显;生产条件的改善对北方粮食单产的增长有重要作用,比较利益的驱使导致南方粮食单产下滑。  相似文献   

五台山腹地早前寒武纪变质岩中白云母的初步研究     

党修鹏 《矿物岩石》1993,13(2):1-8

五台山早前寒武纪变质岩中的白云母属二八面体的2M型多型变体,其中五台群中的白云母为富含绿鳞石分子的普通白云母,滹沱群为多硅白云母。通过对这些白云母化学成分和b_0值测定,确定五台群变质条件属中低压相系,滹沱群属中高压相系。五台群绿片岩相的变质压力为0.3—0.5 GPa,滹沱群为0.5—0.6 GPa。基于白云母成分和b_0值的研究,对划分变质级别、变质类型;确定变质作用期次;进行地层对比和构造分析等方面是可行的。  相似文献   

柴达木盆地西部地区古近纪与新近纪沉积相   总被引：21，自引：8，他引：21       下载免费PDF全文

党玉琪  尹成明  赵东升 《古地理学报》2004,6(3):297-306

利用数十口井的电性、岩性及分析化验资料，将柴达木盆地西部地区古近纪与新近纪沉积相划分为七种相和亚相：洪积锥、水下冲积扇、河道和泛滥平原、滨湖、浅湖、较深湖和三角洲。沉积相的空间展布概括起来分为三大带：（1）阿尔金山前西段陡坡带洪积锥-水下冲积扇-扇三角洲-河道和泛滥平原-湖相 (2)阿尔金山前中段陡坡带洪积锥-水下冲积扇-湖相；（3）昆仑山前洪积锥-河道和泛滥平原-三角洲相。沉积相不仅影响着碎屑岩的成分和结构，而且也影响其物性与含油性。由洪积锥到水下冲积扇，到河道和泛滥平原，到三角洲，到湖相，石英和胶结物含量逐渐升高，岩屑和杂基含量逐渐降低，分选及磨圆变好，颗粒的粒级变细。浅层以河道和泛滥平原及三角洲相的物性最好，深层以三角洲相的物性最好，次为冲积扇，湖相最差。碎屑岩的油气富集以河道、泛滥平原和三角洲相最好，滨浅湖相油气富集最差。  相似文献   

Geochemistry and origin of the giant Quaternary shallow gas accumulations in the eastern Qaidam Basin, NW China   总被引：1，自引：0，他引：1  

Xiongqi Pang  Wenzhi Zhao  Aiguo Su  Shuichang Zhang  Maowen Li  Yiqi Dang  Fengying Xu  Ruilian Zhou  Daowei Zhang  Ziyuan Xu  Zhiqiang Guan  Jianfa Chen  Sumei Li 《Organic Geochemistry》2005,36(12):1636

This study provided an overview of the geological setting and geochemical characteristics of the Pleistocene shallow gas accumulations in the eastern Qaidam Basin, NW China. The five largest gas accumulations discovered in this region have a combined enclosure area of about 87 km² and 7.9 trillion cubic feet (tcf) of proven gas reserves. The dominance of methane (mostly more than 99.9%) and the δ¹³C and δD values of methane (−68.51 to −65.00‰ and −227.55 to −221.94‰, respectively) suggest that these gases are biogenic, derived from the degradation of sedimentary organic matter by methanogens under relatively low temperatures (<75 °C). A sufficient supply and adequate preservation of organic matter in the Pleistocene sediments was made possible by the lake basin’s high altitude (2600–3000 m), high water salinity (>15% TDS) and strong stratification. The deposition and extensive lateral occurrence of lacustrine – shoreline sands/silts in beach sand sheets and sand bars provided excellent reservoirs for the biogenic gas generated from adjacent rocks. Effective but dynamic gas seals are provided by a combination of factors, such as the intermittent vertical variation in the sediment lithologies, hydraulic trapping due to the mudstone water saturation, the hydrocarbon gradient created as the result of gas generation from potential caprocks, and the presence of a regional caprock consisting of 400–800 m of muds and evaporites. It appears that the most favorable traps for large gas accumulations occur on structural slopes near the major gas kitchen, and the prolific gas pools are often those large gentle anticlines with little faulting complication.  相似文献   

Generation and accumulation of Quaternary shallow gas in eastern Qaidam Basin, NW China     

苏爱国赵文智  党玉琪张水昌黎茂稳  庞雄奇周瑞年管自强  徐子远张道伟谭彦虎  陈践发李素梅 《中国地球化学学报》2006,25(1):43-55

1INTRODUCTION SHALLOW(MOSTLYBIOGENIC)GASACCOUNTSFOROVER20%OFTHEWORLD’SDISCOVEREDGASRESERVES(RICEAND CLAYPOOL,1981;CLAYPOOLANDKAPLAN,1974),AND REPRESENTSONEOFTHEUNCONVENTIONALENERGYSOURCES THATINCREASINGLYATTRACTTHEATTENTIONOFPETROLEUMGEOL OGISTS.NUMEROUS…  相似文献   

Ⅱ型SMA-橡胶隔震支座及其理论模型     

李党  薛素铎  庄鹏 《世界地震工程》2006,22(4):52-58

将形状记忆合金（SMA）索与普通叠层橡胶垫复合可以形成具有滞回阻尼性能的SMA-橡胶隔震支座。在原SMA-橡胶支座（Ⅰ型）的基础上，在支座中增加弹簧改善SMA耗能拉索的功能，设计了Ⅱ型SMA-橡胶支座，建立了支座的理论模型。通过数值计算详细考察了此种支座的工作特性，并与Ⅰ型SMA-橡胶支座的性能进行了对比。  相似文献   

脉金矿床研究进展   总被引：4，自引：0，他引：4  

丁式江  翟裕生 《矿产与地质》1998,12(1):1-6

近年来脉金矿床在成因模式研究方面,有岩浆成因模式,变质模式、地幔去气—麻粒岩化和连续成矿模式等。并着重从成矿流体、矿质来源、沉淀过程和构造背景方面,探讨了脉金产出的地球动力学背景,控矿构造特征,煌斑岩（脉）与金成矿时空关系等。指出我国主要产于花岗岩中的脉金矿床,其流体来源性质,花岗岩中构造对成矿的控制作用,花岗岩的地球动力学背景是值得注意的研究课题。并指出应谨慎对待同位素测年资料。  相似文献   

关于新版“图书情报微机管理与检索系统（SXTQ）”   总被引：2，自引：2，他引：0  

党发宽 《时间频率学报》1998,21(2):88-94

介绍了更新“图书情报微机管理与检索系统”版本的历史背景。FoxPro关系数据库系统的优点和该系统在当前的优势,以及该系统软件的安装方法及环境要求;叙述了SXTQ新版的改进部分,并为其配置了条形码扫描器与作者使用FoxPro编程的几点体会及本系统的安装使用说明。  相似文献