飞凤山处置场地下水水化学、氢氧稳定同位素特征及其指示意义
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摘要
飞凤山低中放固体废物处置场是中国西南地区极为重要的核废料处置场。处置场位于四川省北部山区,地层是一套志留系泥页岩,属于传统意义上的低渗透性岩类,但处置场地下水特征与低渗透性岩类中地下水活动规律不符。为了研究处置场地下水特征与补排关系,通过现场调查、取样分析等手段,测定处置场及其周边地下水的化学特征及同位素,分析地下水补给、径流、排泄关系,掌握地下水的基本规律。研究表明:飞凤山处置场地下水化学类型主要为HCO_3-Ca型,处置场降水井地下水化学类型为HCO_3~-(K+Na)·Ca;研究区氢氧同位素数据表明飞凤山地区凉水井一带及处置场T06取样点附近受降雨直接快速补给,其他区域大气降水入渗地下过程中一定程度受到了蒸发作用的影响;处置场降水井地下水来源虽然是大气降雨,但其补给高程较其他区域更高,且径流通道是处置场SE-NW方向的裂隙密集带。在区域及处置场范围,存在一种地下水通过裂隙密集带径流补给的形式,从而形成了处置场降水井附近的远源补给。
Feifengshan low-intermediate radioactive solid waste disposal repository,located in the northern mountain areas in Sichuan Province,is an extremely important nuclear waste disposal in Southwest China. The stratum ofthe disposal site is a set of Silurian shale,belonging to the traditional low permeability rock,however,thegroundwater characteristics of the site did not conform to the groundwater activity law in low-permeability rock. To study the groundwater characteristics of the site and the relationship between recharge and discharge,various of measures were taken,such as on-site investigation and sample analysis,to determine the groundwater characteristics and isotopes at the disposal site and its surroundings,to analyze the relationship between groundwater recharge,runoff and discharge,and to grasp the basic laws of groundwater. The study demonstrated that themainly groundwater hydrochemical type of the disposal site was HCO_3-Ca and that of the precipitation well was HCO_3~- (K + Na) ·Ca; the hydrogen and oxygen isotopic data of the study areas indicated that the cold water wells and the T06 sampling site were directly recharged by rainfall,while the other areas were more or less affected by evaporation during the atmospheric precipitation into ground; The ground water source of the precipitation wells was rainfall and the recharge elevation was higher than other areas and the runoff channels were the fissure dense zones passing through the SE-NW direction. Within the region and the disposal site,there was ground water replenished through the fissure of the site,which was regarded as a remote source supply for the precipitation wells of the disposal site.
Feifengshan low-intermediate radioactive solid waste disposal repository,located in the northern mountain areas in Sichuan Province,is an extremely important nuclear waste disposal in Southwest China. The stratum ofthe disposal site is a set of Silurian shale,belonging to the traditional low permeability rock,however,thegroundwater characteristics of the site did not conform to the groundwater activity law in low-permeability rock. To study the groundwater characteristics of the site and the relationship between recharge and discharge,various of measures were taken,such as on-site investigation and sample analysis,to determine the groundwater characteristics and isotopes at the disposal site and its surroundings,to analyze the relationship between groundwater recharge,runoff and discharge,and to grasp the basic laws of groundwater. The study demonstrated that themainly groundwater hydrochemical type of the disposal site was HCO_3-Ca and that of the precipitation well was HCO_3~- (K + Na) ·Ca; the hydrogen and oxygen isotopic data of the study areas indicated that the cold water wells and the T06 sampling site were directly recharged by rainfall,while the other areas were more or less affected by evaporation during the atmospheric precipitation into ground; The ground water source of the precipitation wells was rainfall and the recharge elevation was higher than other areas and the runoff channels were the fissure dense zones passing through the SE-NW direction. Within the region and the disposal site,there was ground water replenished through the fissure of the site,which was regarded as a remote source supply for the precipitation wells of the disposal site.
引文
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2 OyarzunR,Jofre E,Morales P,et al.Ahydrogeochemistry and isotopic approach for the assessment of surface water-groundwater dynamics in an arid basin:the Limari watershed,north-central Chile[J].Environmental Earth Sciences,2014,73(1):39-55
3滕彦国,左锐,王金生,等.区域地下水演化的地球化学研究进展[J].水科学进展,2010,21(1):127-136Teng Yanguo,Zuo Rui,Wang Jinsheng,et al.Progress in geochemistry of regional groundwater evolution[J].Advances in Water Science,2010,21(1):127-136
4袁建飞,邓国仕,徐芬,等.毕节市北部岩溶地下水水文地球化学特征[J].水文地质工程地质,2016,43(1):12-21Yuan Jianfei,Deng Guoshi,Xu Fen,et al.Hydrogeochemical characteristics of karst groundwater in the northern part of the city of Bijie[J].Hydrogeology&Engineering Geology,2016,43(1):12-21
5邓启军,李方红,李伟,等.蒲阳河流域地下水水化学及同位素特征[J].水文地质工程地质,2017,44(2):8-14Deng Qijun,Li Fanghong,Li Wei,et al.The chemical and isotopes characteristic of groundwater in Puyang River Basin[J].Hydrogeology&Engineering Geology,2016,44(2):8-14
6章斌,郭占荣,高爱国,等.用氢氧稳定同位素揭示闽江河口区河水、地下水和海水的相互作用[J].地球学报,2013,34(2):213-222Zhang Bin,Guo Zhanrong,Gao Aiguo,et al.An analysis of the interaction between river water,groundwater and seawater in Minjiang river estuary region,Fujian Province,based on stable isotopes D and18O[J].Acta Geoscientica Sinica,2013,34(2):213-222
7王晓曦,王文科,王周锋,等.滦河下游河水及沿岸地下水水化学特征及其形成作用[J].水文地质工程地质,2014,41(1):25-33,73Wang Xiaoxi,Wang Wenke,Wang Zhoufeng,et al.Hydrochemical characteristics and formation mechanism of river water and groundwater along the downstream Luanhe River,northeastern China[J].Hydrogeology&Engineering Geology,2014,1(1):25-33,73
8陈宗宇,万力,聂振龙,等.利用稳定同位素识别黑河流域地下水的补给来源[J].水文地质工程地质,2006,33(6):9-14Chen Zhongyu,Wan Li,Nie Zhenlong,et al.Identification of groundwater recharge in the Heihebasin using environmental isotopes[J].Hydrogeology&Engineering Geology,2006,33(6):9-14
9张智雄,许模,张强,等.绵阳红层地区浅层地下水水化学特征、成因及水质分析[J].科学技术与工程,2018,18(3):168-173Zhang Zhixiong,Xu Mo,Zhang Qiang,et al.Hydrogeochemistry,genesis and waterquality analysis of shallow groundwater in red-bed area of the Mianyang City[J].Science Technology and Engineering,2018,18(3):168-173
10岳冬冬,苏小四.沂沭河下游平原地下水化学及氢氧稳定同位素特征[J].科学技术与工程,2016,16(16):113-119Yue Dongdong,Su Xiaosi.Chemistry and stable isotope characteristics of Yishu river downstream groundwater[J].Science Technology and Engineering,2016,16(16):113-119