Groundwater vulnerability and contamination risk assessment of the Weining Plain,using a modified DRASTIC model and quantized pollution loading method     

Xinyan Li  Yanyan Gao  Hui Qian  Hao Wu 《Arabian Journal of Geosciences》2017,10(21):469

Groundwater resources have become more vulnerable to contamination due to rapid population growth and economic development. This study aimed to assess the groundwater contamination risk in the Weining Plain, China. Based on the specific conditions of the Weining Plain, a new model DRTSWI with a weighting scheme determined by analytic hierarchy process was developed to evaluate the intrinsic groundwater vulnerability for the study area. An integrated approach, combining the toxicity, the release possibility, and the potential release quantity of the pollutants, was used to estimate the pollution loading. The groundwater contamination risk results were obtained by overlaying the intrinsic vulnerability and pollution loading maps. These indicated that two industrial parks pose the main threat to groundwater quality, due to their unfavorable hydrogeological setting and potential pollution sources on the surface. Some areas in and around the industrial parks exhibit groundwater pollution, which was identified on the contamination risk map using buffer analysis. High risk areas are industries with high or medium vulnerability. The vulnerability and contamination risk maps developed for this study are valuable tools for environmental planning and can be used for predictive management of groundwater resources.  相似文献   

中国南极陨石研究新进展          下载免费PDF全文

林杨挺  王道德  欧阳自远 《极地研究》2008,20(2):81-94

本文对我国南极陨石的收集、分类和研究工作进行了回顾和阶段性的总结。4次格罗夫山考察共发现陨石样品9834块,其中已完成和计划2008年完成分类的陨石共2431块。在正式公布的684块已分类陨石中,鉴定出2块火星陨石、2块灶神星陨石、6块橄辉无球粒陨石、5块中铁陨石、1块橄榄陨铁、1块铁陨石以及10块碳质球粒陨石等特殊样品,并对其中的部分样品开展了深入的研究。建议拓展南极陨石的收集,持续开展陨石的分类工作,并提出我国南极陨石研究的重点方向。  相似文献   

0212号强热带风暴过程分析   总被引：1，自引：1，他引：0  

陈坤林  欧阳桂生 《气象》2003,29(9):47-49

0212号强热带风暴“北冕”对闽南粤东地区造成严重影响。利用天气形势、T213数值预报产品和本站气象要素等资料,对“北冕”强热带风暴进行了综合分析。分析表明,引导气流的调整,高空辐散场的抽气作用使“北冕”路径改变,强度加强：低空偏南风急流的存在和维持源源不断输送水汽,强烈的辐合上升运动,大气层结极不稳定是强热带风暴后部暴雨产生和维持的条件。  相似文献   

The Institute of Geographic Sciences and Natural Resources Research,CAS     

Liu?JiyuanEmail author  Cheng?Shengkui  Ouyang?Hua  Li?Xiubin  Sun?Junjie 《地理学报(英文版)》2004,14(1):97-97

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Compositional Study of a Suite of Samples from the 28-t Armanty (Xinjiang) Iron Meteorite     

John T. Wasson  Xinwei Ouyang  Daode Wang 《Meteoritics & planetary science》1988,23(4):365-369

Abstract— Neutron activation analysis of 15 samples from widely separated locations on the surface of the 28-t Armanty (Xinjiang) group-IIIE iron meteorite showed no compositional variations attributable to magmatic fractionation processes such as fractional crystallization. The homogeneity contrasts with that observed in the Cape York IIIAB iron, in keeping with the idea that the latter is an exceptional case. From the maximum compositional gradients we estimate that the radius of the HIE core was > 1 km. One sample taken from a surface formed by fracture associated with its fall to Earth is slightly anomalous in composition; we suspect that this region is near the border between two parental γ crystals and has a high content of minor phases.  相似文献   

Advances in lunar exploration detectors     

胥涛 欧阳自远  李春来徐琳 《中国地球化学学报》2005,24(1):95-100

Due to the rapid development of modern science and technology, many advanced sensors have been put into use to explore our solar system, including the Moon. With the help of those detectors,we can retrieve more information to about the Moon‘ s composition and evolution. The Clementine (January, 1994), Lunar Prospector (January, 1998) and especially Smart-1 ( September, 2003) launched successively have demonstrated the next-generation planet exploration techniques. Now China has decided to send a probe to the Moon. So it is necessary to overview the development of detectors used for the scientific observation of the Moon. In this paper, some main instruments used to acquire geochemistry information are described, which include UV-VIS-NIR CCD imaging spectroscope, neutronray, gamma-ray, and X-ray spectrometers. Moreover, the payloads of China‘ s first lunar satellite are introduced briefly.  相似文献   

Stratigraphical and biological significance of negative carbon isotopic anomalies in the basal Cambrian series of Guizhou Province   总被引：2，自引：0，他引：2  

杨瑞东王世杰  欧阳自远朱立军  姜立君张位华 高慧 《中国地球化学学报》2005,24(2):108-115

The early Early Cambrian strata within the bounds of Guizhou Province are almost predominated by black shale deposition. Recently, however, the authors have found a section consisting of a set of mudstones interbedded with limestones at the basement of the Cambrian at Yingping, Fuquan County,Guizhou Province, which provides favorable conditions for the study of marine geochemical characteristics of the early Early Cambrian. The characteristics of intense negative carbon isotopic anomalies near the Precambrian/Cambrian boundary at Yingping, Fuquan County, Guizhou Province, can be correlated with those of global carbon isotopic anomalies at the same time on a global scale, corresponding to the intense negative carbon isotopic anomalies near the Neoproterozoic/Cambrian boundaries at the bottom of the Xiaowaitoushan Member, Huize, Yunnan Province, at the top of the Tsagaan 0loom Formation of Mongolia and at the top of the Salarmy Gol Formation of Siberia, as well as those observed in southwestern United States, Iran, Amman, Poland, Newfoundland, the Great Britain, Canada, etc. Negative carbon isotopic anomalies can be used as the important basis for the division of the Precambrian/Cambrian boundaries.There have been found 8 m-thick black shales and cherts below the intense negative carbon isotopic anomalies in this profile. In the black shales there have been found large amounts of fossils such as Bradoricla,gernus Archotuba, indicating that during the period of sedimentation of black shales under anaerobic conditions there would be large quantities of organic species living in the sea. But in the section of grayish-green mudstones interbedded with limestones with intense negative carbon isotopic anomalies almost no organic fossil has been found. This may imply that the anaerobic event seems to have little bearing on the mass extinction near the Precambrian/Cambrian boundary, whereas the intense negative carbon isotopic anomaly event appears to be more closely related to the mass extinction occurring near the Precambrian/Cambrian boundary.  相似文献   

基于锥形模型的空间方向查询研究     

夏宇  朱欣焰  苏科华 《地理空间信息》2007,5(3):65-67

分析了基于锥形模型进行空间方向查询的原理,提出应结合不同实际应用领域和针对不同的空间数据特征选择适当的空间方向关系形式化描述模型的思想。按照这种思想,针对全国各省1∶25万县市级行政区划数据,设计并实现了基于八方向锥形模型的空间方向查询,取得了比较好的检索效果。  相似文献   

Research on runoff forecast approaches to the Aksu River basin   总被引：1，自引：0，他引：1  

Ouyang RuLin  Cheng WeiMing  Wang WeiSheng  Jiang Yan  Zhang YiChi  Wang YongQin 《中国科学D辑(英文版)》2007,50(1):16-25

The Aksu River (the international river between China and Kirghiz) has become the main water source for the Tarim River. It significantly influences the Tarim River’s formation, development and evolution. Along with the western region development strategy and the Tarim River basin comprehensive development and implementation, the research is now focused on the Aksu River basin hydrologic characteristic and hydrologic forecast. Moreover, the Aksu River is representative of rivers supplied with glacier and snow melt in middle-high altitude arid district. As a result, the research on predicting the river flow of the Aksu River basin has theoretical and practical significance. In this paper, considering the limited hydrometeorological data for the Aksu River basin, we have constructed four hydrologic forecast approaches using the daily scale to simulate and forecast daily runoff of two big branches of the Aksu River basin. The four approaches are the upper air temperature and the daily runoff correlation method, AR(p) runoff forecast model, temperature and precipitation revised AR(p) model and the NAM rainfall-runoff model. After comparatively analyzing the simulation results of the four approaches, we discovered that the temperature and precipitation revised AR(p) model, which needs less hydrological and meteorological data and is more predictive, is suitable for the short-term runoff forecast of the Aksu River basin. This research not only offers a foundation for the Aksu River and Tarim Rivers’ hydrologic forecast, flood prevention, control and the entire basin water collocation, but also provides the hydrologic forecast reference approach for other arid ungauged basins.  相似文献   

Mafic enclaves at Jiru porphyry Cu deposit, southern Tibet: Implication for the Eocene magmatic-hydrothermal Cu mineralization     

SUN Xiang  ZHENG Youye  WU Song  LI Miao  Ouyang Haitao  GENG Ruirui 《《地质学报》英文版》2013,87(Z1):778-782

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