Hydrogeology and hydrochemistry of the Parmelia aquifer,northern Perth Basin,Western Australia     

E. B. Bekele  R. B. Salama  D. P. Commander 《Australian Journal of Earth Sciences》2013,60(6):891-904

This study aims to characterise the hydrogeology and hydrochemistry of the Parmelia aquifer and to understand controls on recent water-level changes as these are needed to underpin a quantitative analysis of recharge. The Parmelia aquifer, a layered sequence of sand, silt and discontinuous lenses of clay, receives diffuse rainfall recharge on its outcrop and groundwater recharge occurs across the Dandaragan Plateau at different rates. Water levels have risen steadily over the last three decades between 10 and 55 cm/y in response to the replacement of native vegetation with pasture and annual crops. The mean aquifer properties from sediment analyses indicate a very wide range of porosity (8.9 – 49.5 %) with an arithmetic mean of 26% and consequently a very broad range of specific yield (0.0004 – 0.4) with an arithmetic mean of 0.14. Groundwater in the Parmelia aquifer has an underlying meteoric origin with compositional changes due to reactions with silicate minerals and leaching of chloride that has concentrated in the soil by evapotranspiration. The hydrochemistry sampled at different depths and locations in the aquifer indicates that the groundwater is not well mixed, and variations arise due to relatively recent recharge that has undergone evaporation in some areas.  相似文献   

Aquifer heterogeneity: Hydrogeological and hydrochemical properties of the Botany Sands aquifer and their impact on contaminant transport   总被引：1，自引：0，他引：1  

J. Jankowski  P. Beck 《Australian Journal of Earth Sciences》2013,60(1):45-64

Detailed geological mapping and drilling has shown that the contact between the Cambrian volcano‐sedimentary sequence at Rosebery and the Mt Read Volcanics is formed by a major thrust fault dipping east at 40° and having a displacement of at least 1.5 km. The sedimentary sequence is part of the Dundas Group, a Middle to Late Cambrian forearc‐like sequence which unconformably overlaps the volcanics south of Rosebery. The Rosebery Thrust Fault marks the eastern boundary of a zone of folding, faulting and disruption which affects the Dundas Group and the tectonically interfingered and underlying basaltic greywacke‐mudstone sequence of the Crimson Creek Formation. At least some of this deformation occurred prior to deposition of the Ordovician Limestone, as evidenced by marked angular discordances. The complex area can be interpreted as a Cambrian accretionary prism‐forearc‐arc sequence developed above an east‐dipping subduction zone.

The Henty Fault System, which cuts obliquely through the Mt Read belt and encloses a misfit wedge of sediments, pillow lavas, gabbros and ultramafic rocks, is interpreted as a remnant of an inter‐arc basin. The fault system separates a dacitic‐andesitic arc segment to the northwest from a more rhyolitic segment to the southeast. The latter is overlain by a younger arc sequence, the Tyndall Group, which may have been the source for the Dundas Group volcanic detritus.  相似文献   

Salinity on the southeastern Dundas Tableland,Victoria     

P. G. Dahlhaus  R. J. MacEwan  E. L. Nathan  V. J. Morand 《Australian Journal of Earth Sciences》2013,60(1):3-11

Historical evidence of early salinity, vegetation and landuse changes, and pedological studies have been used in formulating a new model for salinity processes acting on the Dundas Tableland in southwestern Victoria. Contrary to previous assumptions, salinity in this area was a feature of the pre‐European landscape and was noted in the earliest surveys and journals. Analysis of historical records show an initial post‐settlement increase in the tree numbers, followed by a rapid decline much later than previously assumed. Accumulation of salts in the regolith may be attributed to marine incursions during the Miocene and Pliocene, the extensive weathering to develop a deep regolith, and wind‐blown and cyclic salt accumulation. A trend analysis of historical streamflow and bore hydrograph records does not indicate rising groundwater levels. The pedological features of duplex and sodic soil profiles support a history of prolonged seasonal waterlogging. A model with seasonal lateral flow of water through the upper regolith can better account for the spread of salinity than the rising groundwater hypothesis. By control of waterlogging, land managers could improve soil structure, enhance root growth and soil water use, as well as inhibit the spread of salinity.  相似文献   

Understanding salt mobilization from an irrigated catchment in south‐eastern Australia     

B. Selle  T. Thayalakumaran  M. Morris 《水文研究》2010,24(23):3307-3321

Groundwater discharge from the Riverine Plains of the southern Murray‐Darling Basin is a major process contributing salt to the Murray River in Australia. In this study, data from an irrigated 60 000 ha catchment in the Riverine Plains were analysed to understand groundwater discharge into deeply incised drains, the process dominating salt mobilization from the catchment. We applied three integrated methodologies: classification and regression trees (CART), conceptual modelling and artificial neural networks (ANNs) to a comprehensive, spatially lumped, monthly data set from July 1975 to December 2004. Using CART analysis, it was shown that rainfall was the most important variable consistently explaining the salt load patterns at the catchment outlet. Using the conceptual model representing spatially lumped groundwater discharge into deeply incised drains, we demonstrated that salt mobilization from the study catchment can be well represented by a rainfall contribution, influenced by the hydraulic head in the deep regional aquifer and potential evapotranspiration. Using ANNs, it was confirmed that rainfall had a much higher impact on salt loads at the catchment outlet than irrigation water use. All these results demonstrate that under conditions similar to those experienced from 1975 to 2004, it is rainfall rather than irrigation water use that governs salt mobilization from the study catchment. Management of salt mobilization from irrigated catchments has traditionally focussed on the improvement of irrigation practices but it could be equally important to further understand the scope for management to control groundwater discharge in these irrigation areas. Copyright © 2010 John Wiley & Sons, Ltd.  相似文献   

山东大汶河流域中上游古近系含水岩组水文地质特征   总被引：7，自引：0，他引：7       下载免费PDF全文

周乐  刘元晴  李伟  朱庆俊  李凤哲  吕琳  邓启军  马雪梅  何锦 《中国地质》2019,46(2):316-327

利用古近系大汶口组及朱家沟组含水岩组5眼施工钻孔及55眼井孔调查资料,通过岩心、地下水常规离子组分及氢氧同位素样品测试结果,研究大汶河流域中上游莱芜盆地、大汶口盆地古近系含水岩组分布特征、物性及富水性、地下水化学及补给循环特征。结果表明:富水较好的大汶口组上段位于盆地腹部偏北,含水层岩性为半固结砂砾岩,水化学类型HCO_3-Ca·Mg型为主;朱家沟组含水岩组位于盆地边界断裂下降盘,含水层岩性为溶蚀发育的灰质砾岩,水化学类型复杂多变。现代大气降水作为地下水主要补给来源,蒸发浓缩作用,方解石、白云石和石膏溶解及人类污染活动参与了地下水化学组分的形成。归纳总结3种古近系不同类型含水岩组地下水富集规律:构造裂隙控水模式、半固结含水岩组裂隙孔隙水富集模式和灰质砾岩裂隙岩溶水富集模式。  相似文献   

地域生态环境保护与城市规划布局中的地下水资源评价——以鄂西岗地董市幅1:50 000水文地质图数据集为例          下载免费PDF全文

肖攀  何军  彭轲  许珂 《中国地质》2019,46(S2):93-101

鄂西岗地1：50 000水文地质图数据集是在董市幅实施水文地质测绘、地球物理勘探、遥感地质解译、水文地质钻探、水样品采集测试及地下水位监测与统测等工作基础上完成原始数据采集,综合前期收集资料的整理分析与最新采集数据集成编制而成。原始数据采集主要包括遥感地质解译面积450 km²,机（民）调查点226个,地质调查点125个,环境地质调查点16个,水文地质钻探孔12眼,工程地质钻探孔8眼,水样品（全分析、同位素及有机污染样）合计采集80组,丰、枯水期地下水位统测各40点次,以及机（民）井监测12点位（一个水文年监测）等,数据采集严格遵守《水文地质调查规范》（DZ/T 0282-2015）《水文水井地质钻探规程》（DZ/T 0148-2014）等规范与技术要求组织实施,保证数据的准确可靠。数据集采用MapGIS 6.7平台辅助制图,坐标系为1984年西安坐标系,投影方式为高斯-克吕格投影（6度带）。水文地质图编制是以地下水系统理论为指导,充分展现关键水文地质信息与地下水资源现状条件,为区域地下水资源开发利用远景规划与有效保护提供直接依据,能够促进长江中游生态文明建设与长江中游经济带快速发展。  相似文献   

织纳煤田红梅煤矿瓦斯分布特征及其控制因素研究     

胡传文  李碧 《吉林地质》2019,38(2):72-76

为了查明煤层瓦斯赋存的地质规律,探讨其控制因素,基于矿区地质资料和瓦斯化验结果,对贵州省织纳煤田织金矿区红梅煤矿可采煤层瓦斯分布特征进行了研究。研究结果表明,矿区可采煤层基本处于沼气带,且属于富甲烷煤层;在垂向上,煤层呈波动式,体现了沉积-水文-构造地质条件耦合作用;在平面上,具有向斜控气特征,正是在埋深背景上构造-水文地质条件耦合作用的结果。  相似文献   

双管双动取心钻具异径接头的改进          下载免费PDF全文

张万河 《探矿工程》2010,37(1):37-39

介绍了在河北衡水水文地质科学钻探中对双管双动取心钻具异径接头所做的改进及取得的效果。  相似文献   

观斗山隧道水文地质条件分析及涌水量预测     

杨彪山 《地质灾害与环境保护》2012,23(2):95-99

在对隧道两侧进行水文地质调查的基础上,结合调查区地质环境背景,查明该区水文地质条件。分析不同地层岩性的含水性和富水性,评价地下水的补给、径流和赋存特征,预测隧道开挖时可能发生涌突水的位置。采用狭长水平廊道法、大气降水入渗系数法、比拟法和大气降水入渗法对隧道涌水量进行预算,为隧道施工开挖预防涌突水灾害提供依据。  相似文献   

卡乌留克塔格铁磷矿区水文地质特征探析     

郗国庆  梁中朋  杨煊 《化工矿产地质》2012,(3):143-148

通过对卡乌留克塔格矿区自然地理特征及地质特征的分析,认为矿区的地下水主要为第四系孔隙水和基岩裂隙水,其补给来源一是降雨,二是地表水,三是山区地下暗流。矿山开采后对水资源环境的影响主要会引起地面沉陷,地下水位下降。应采取先探后采.边采边探的生产安全措施。  相似文献