共查询到20条相似文献,搜索用时 31 毫秒
1.
Hydrogeochemical and isotopic study of groundwater in the Habor Lake Basin of the Ordos Plateau,NW China 总被引:2,自引:2,他引:0
Lihe Yin Guangcai Hou Yan Dou Zhengping Tao Ying Li 《Environmental Earth Sciences》2011,64(6):1575-1584
Hydrogeochemistry and isotopes were used to understand the origin and geochemical evolution in the Habor Lake Basin, northwestern
China. Groundwater samples were taken, and the isotopic compositions δD, δ18O and major ions were analyzed. The groundwater can be divided into three types: the Quaternary groundwater, the shallow Cretaceous
groundwater and the deep Cretaceous groundwater. The groundwater chemistry is mainly controlled by the feldspar weathering
and dolomite weathering, the dissolution of Glauber’s salt, and cation exchange. Chemistry of lake water is mainly controlled
by evaporation and precipitation. The stable isotopes of oxygen and hydrogen in groundwater cluster along the local meteoric
water line, indicating that groundwater is of meteoric origin. Comparing with shallow groundwater, deep groundwater is depleted
in heavy isotopes indicating that deep groundwater was recharged during late Pleistocene and Holocene, during which the climate
was more wetter and colder than today. 相似文献
2.
Lihe Yin Guangcai Hou XiaoSi Su Dong Wang Jiaqiu Dong Yonghong Hao Xiaoyong Wang 《Hydrogeology Journal》2011,19(2):429-443
The characteristics of δD and δ18O in precipitation, groundwater and surface water have been used to understand the groundwater flow system in the Ordos Plateau, north-central China. The slope of the local meteoric water line (LMWL) is smaller than that of the global meteoric water line (GMWL), which signifies secondary evaporation during rainfall. The distribution of stable isotopes of precipitation is influenced by temperature and the amount of precipitation. The lake water is enriched isotopically due to evaporation and its isotopic composition is closely related to the source of recharge and location in the groundwater flow systems. River water is enriched isotopically, indicating that it suffers evaporation. The deep groundwater (more than 150?m) is depleted in heavy isotopes relative to the shallow groundwater (less than 150?m), suggesting that deep groundwater may have been recharged during the late Pleistocene and early Holocene, when the climate was wetter and colder than at present. All groundwater samples plot around the LMWL, implying groundwater is of meteoric origin. Shallow groundwater has undergone evaporation and the average evaporation loss is 53%. There are two recharge mechanisms: preferential flow, and the mixture of evaporated soil moisture and subsequent rain. 相似文献
3.
Xin Liu Xianfang Song Yinghua Zhang Jun Xia Xuecheng Zhang Jingjie Yu Di Long Fadong Li Bing Zhang 《Environmental Earth Sciences》2011,63(5):1105-1118
Groundwater is of utmost significance to socio-economic development and ecological recovery for the Loess Plateau. However,
studies regarding the mechanism governing groundwater recharge over this area appear to be inadequate. This study is to examine
the spatio-temporal variations of δ2H and δ18O in precipitation and shallow groundwater. On the basis of this, the mechanisms governing shallow groundwater recharge were
explored. Precipitation and groundwater were sampled monthly from May to October during the period 2004–2006 at 13 sites in
the Chabagou Catchment (187 km2). In the Caopingxigou Experimental Watershed (0.1 km2), meteorological variables were observed and rainfall larger than 5 mm was sampled immediately after each rain event. Across
the area, 90% of the precipitation occurred from May to September primarily in the form of heavy rains or rainstorms with
great spatial variability. There were about 30 localized rains in each year. It was indicated that there existed notable seasonality
and pronounced spatial variability in precipitation isotopic compositions. Contributing factors and indications of isotopic
compositions, as well as their climatic indications such as monsoon intensities and mixing processes of water vapor, were
investigated. The δ2H–δ18O relation of groundwater was found to be δ2H = 3.22 × δ18O − 38.1, deviating from the local meteoric water line δ2H = 7.57 × δ18O + 3.9. The range of δ values in groundwater is shrunken to be 15–21% of that in individual precipitations, and groundwater in the middle reaches
shows a wider range of δ values. Isotopic results showed that groundwater originates from precipitation with hydrogen and oxygen isotopic compositions
being −69 and −9.7‰, respectively, and most groundwater experiences serious evaporation and adequate mixing with old water
during infiltration or percolation in the aerated zone. It was also founded that obvious fluctuations of isotopic compositions
in groundwater mainly appear in the middle reaches especially at sites that are close to valleys, suggesting varying sources
of groundwater from precipitation, precipitation runoff, isotopically enriched surface water and/or lateral recharge of adjacent
groundwater. 相似文献
4.
Ratan K. Majumder M. A. Halim B. B. Saha Reo Ikawa Toshio Nakamura Makoto Kagabu Jun Shimada 《Environmental Earth Sciences》2011,64(5):1343-1352
A total number of 328 groundwater samples are analysed to evaluate the groundwater flow systems in Bengal Delta aquifers,
Bangladesh using environmental isotope (2H, 18O, 13C, 3H, and 14C) techniques. A well-defined Local Meteoric Water Line (LMWL) δ2H = 7.7 δ18O + 10.7 ‰ is constructed applying linear correlation analyses to the monthly weighted rainfall isotopic compositions (δ18O and δ2H). The δ18O and δ2H concentrations of all groundwater samples in the study area are plotted more or less over the LMWL, which provides compelling
evidence that all groundwaters are derived from rainfall and floodwater with a minor localized evaporation effects for the
shallow groundwaters. Tritium concentration is observed in 40 samples out of 41 with values varying between 0.3 and 5.0 TU,
which represents an evidence of young water recharge to the shallow and intermediate aquifers. A decreasing trend of 14C activity is associated with the heavier δ13C values, which indicates the presence of geochemical reactions affecting the 14C concentration along the groundwater flow system. Both vertical and lateral decrease of 14C activity toward down gradient show the presence of regional groundwater flow commencing from the unconfined aquifers, which
discharges along the coastal regions. Finally, shallow, intermediate, and deep groundwater flow dynamics has revealed in the
Bengal Delta aquifers, Bangladesh. 相似文献
5.
Oxygen and hydrogen isotopes for the characteristics of groundwater recharge: a case study from the Chih-Pen Creek basin,Taiwan 总被引:5,自引:2,他引:3
Assessing the seasonal variation of groundwater recharge is important for effective management of groundwater resources. Stable
isotopes of oxygen and hydrogen were used to estimate the sources of groundwater and seasonal contributions of precipitation
to groundwater recharge in Chih-Pen Creek basin of eastern Taiwan. Based on the isotopes of precipitation (n = 177), two different local meteoric water regression lines (LMWL) can be obtained for the different seasons: δD = 8.0618O + 10.08 for wet season precipitation (May through October) and δD = 8.65δ18O + 17.09 for dry season precipitation (November through April). The slope and intercept of regression line for wet season
precipitation are virtually identical to the global meteoric water line (GMWL) of Craig (1961). In contrast to during dry season precipitation due to evaporation effect the intercept of 17.09 is much higher than of
the GMWL of 10. The results show the stable isotopes compositions of precipitation decrease with increasing rainfall amount
and air temperature, due to the amount effect of precipitation is pronounced. The amount effect is clearly but do not show
the temperature effect from January to December 2007. Using a mass-balance equation, a comparison of deuterium excess or d values of precipitation and groundwater indicates the groundwater consist of 76% wet season precipitation and 24% dry season
precipitation, representing a distinct seasonal variation of groundwater recharge in study area. About 79% of the groundwater
is recharged from the river water of the mountain watershed and 21% is from the rain that falls on the basin. 相似文献
6.
Groundwater origins and mixing pattern in the multilayer aquifer system of the Gafsa-south mining district: a chemical and isotopic approach 总被引:3,自引:2,他引:1
Younes Hamed Lassaad Dassi Meriem Tarki Riadh Ahmadi Khalid Mehdi Hamed Ben Dhia 《Environmental Earth Sciences》2011,63(6):1355-1368
Major ion geochemistry and environmental isotopes were used to identify the origins and the mineralisation processes of groundwater
flowing within the three aquifer levels of the multilayer system of the Gafsa-south mining district (Southwestern Tunisia).
It has been demonstrated that groundwaters are characterised by a Ca–Mg–SO4 water type. Geochemical pattern is mainly controlled by the dissolution of halite, gypsum and/or anhydrite as well as by
the incongruent dissolution of dolomite. δ18O and δ2H values are much lower than the isotopic signature of regional precipitation and fall close to the meteoric water lines,
indicating that groundwaters have not been significantly affected by evaporation or mineral–water reactions. The distribution
of stable and radiogenic isotopes (δ18O, δ2H, δ13C and 14C) within the aquifer levels suggests that the deep confined aquifer receives a significant modern recharge at higher altitudes,
while, the shallow unconfined aquifer has been mainly recharged under cooler paleoclimatic condition, likely during Late Pleistocene
and Early Holocene humid periods. However, waters from the intermediate confined/unconfined aquifer have composite isotopic
signatures, highlighting that they are derived from a mixture of the two first end-members. 相似文献
7.
S. K. Bhattacharya S. K. Gupta R. V. Krishnamurthy 《Journal of Earth System Science》1985,94(3):283-295
A comprehensive set of measurements of oxygen and hydrogen isotopic ratios in groundwaters as well as waters from rivers,
lakes, hot springs etc. taken from a variety of locations in India has been carried out for the first time. Isotopically the
most depleted samples occur in the high altitude precipitations in the Himalayas e.g. in the lakes of Bhutan and the source
water of the Ganga. The shallow groundwater data display a continental effect where the heavy isotope content decreases with
distance from the coast (about 4 to 6 per mil decrease in δ18O per 1000 km). The δ D and δ18O of these fresh waters are linearly related and an analysis of this relation vis-a-vis the meteoric water line shows the
unambiguous effect of enrichment due to evaporation from soils. 相似文献
8.
Geochemical and isotopic characterization of groundwater from shallow and deep limestone aquifers system of Aleppo basin (north Syria) 总被引:2,自引:2,他引:0
A. Al-Charideh 《Environmental Earth Sciences》2012,65(4):1157-1168
Stable isotopes (δ18O, δ2H and 13C) and radioactivity (3H, 14C) have been used in conjunction with chemical data to evaluate the processes generating the chemical composition, reconstruct
the origin of the water and groundwater residence time. The Aleppo basin is comprised of two main limestone aquifers: the
first one is unconfined of Paleogene age and the second is confined of Upper Cretaceous age. The chemical data indicate that
the dissolution of minerals and evaporation are the main processes controlling groundwater mineralization. The groundwater
from the two aquifers is characterized by distinctive stable isotope signatures. This difference in water isotopes is interpreted
in terms of difference origin and recharge period. Fresh and brackish shallow groundwater were mostly recharged during the
Holocene period. The presence of 3H in several groundwater samples of this aquifer gives evidence that groundwater recharge is going on. Brackish water of the
deep confined aquifer has depleted stable isotope composition and very low 14C activity that indicates recharge during the late Pleistocene cold period. 相似文献
9.
The present work was conducted in the Sinai Peninsula (1) to identify the recharge and flow characteristics and to evaluate
the continuity of the Lower Cretaceous Nubian Sandstone aquifer; and (2) to provide information for the aquifer's rational
appraisal. Isotopic and hydrochemical compositions combined with the geological and hydrogeological settings were used for
this purpose.
A considerable depletion in isotopic content (oxygen-18 and deuterium) and low d-excess values exist in the studied groundwater,
reflecting the contribution of old meteoric water that recharged the aquifer in pluvial times. Modern recharge also occurs
from precipitation that falls on the aquifer outcrops. The wide scatter of the data points around the two meteoric lines,
the global meteoric water line (GMWL) and Mediterranean meteoric water line (MMWL), in the δ18O–δD diagram indicates considerable variation in recharge conditions (amount, altitude, temperature, air masses, distances
from catchment, overland flow, etc.). The isotopic composition in the El-Bruk area is minimum (18O=–9.53‰), very close to the average value of the Western Desert Nubian Sandstone (18O=–10‰), where the local structural and lithologic conditions retard groundwater flow and the main bulk of water becomes noncyclic.
The continuity of the aquifer in northern and central Sinai is evidenced by the isotopic similarity between samples taken
from above and below the central Sinai Ragabet El-Naam fault, the distribution of potentiometric head, and hydrogeological
cross sections.
The combination of isotopic composition in terms of 18O and chemical composition in terms of TDS and salt contents is the basis for separating the studied groundwater into groups
that reflect the recharge sources and isotopic and chemical modifications during flow.
Electronic Publication 相似文献
10.
Compositions of deuterium and 18O isotopes of 90 representative samples indicate that thermal groundwater in most parts of China is meteoric in origin. Latitude,
altitude, and continent effects have significant bearing on the values of δD and δ18O of the hot water samples. Oxygen-18 shift is not significant in most of the thermal groundwater, especially the hot water
of low-to-moderate temperature. Slight oxygen-18 shift is only found in some hot springs of high temperature in Tibet and
western Yunnan and in thermal groundwater of low-to-moderate temperature in the deep-seated carbonate aquifers in the northern
North China Plain (including the Tianjin area). Near-surface boiling may causes the shift of the former and the latter may
be attributed to exchange of oxygen-18 between water and carbonates in the geothermal systems of taphrogenic basin-type. Hot
springs in Tibet and western Sichuan have very low contents of δD and δ18O, possibly due to recharge of precipitation and snow-melting water of extremely depleted δD and δ18O values at high latitudes of several thousands of meters. 相似文献
11.
通过分析闽江河口区降水、地表水和地下水的氢氧稳定同位素特征,揭示降水的环境同位素效应和地下水的形成演化规律,定量评价河口区多种水体的混合过程及地下水输入量。夏季的降水氢氧同位素组成相对贫化,呈现出降雨量效应。在δ18O与δD关系图上,闽江北岸基岩裂隙水、平原及丘陵区浅层地下水均落在福州降水线上,而南岸平原及丘陵区浅层地下水大部分落在福州降水线右下方,其拟合线与降水线交点与5~9月农灌期降水氢氧同位素加权值接近,表明北岸地下水主要来自降水补给,而南岸地下水同时接受灌溉水和降水补给,并在入渗过程中经历了不同程度的蒸发作用。闽江河口段除接受两岸地下水补给外,局部河段还接受断裂带裂隙水补给。将线性端元混合模型、数字高程模型和地下水文分析法结合起来定量评价地下水的输入和各水体的混合过程,结果显示,在河口段淡水区,地下水混合比率上限为8.8%,其中包括0.4%的断裂带裂隙水;在河口段淡咸水混合区,淡水(河水、地下水)和海水的混合比为53:47,其中地下水的保守混合比率为1.7%;枯水期闽江河口段地下水保守输入量为87.0 m3/s,是闽江径流量的12.8%。 相似文献
12.
Axel Horst Jürgen Mahlknecht Miguel Angel López-Zavala Bernhard Mayer 《Environmental Earth Sciences》2011,64(7):1931-1941
Chemical compositions and stable isotope ratios of water and sulphate were used to characterise sources and processes responsible
for elevated concentrations of sulphate and other constituents in groundwater from aquifers at Colima State along Mexico’s
Pacific Coast. The δ18O and δ2H values of the groundwater were similar to those of precipitation indicating a meteoric origin, and recharge processes are
relatively uniform in large parts of the study area with only slight local evaporation effects. δ34Ssulphate and δ18Osulphate analyses indicated that high sulphate concentrations of up to 1,480 mg/l are mainly due to dissolution of evaporites and
volcanic exhalations. Chloride is largely related to sources other than seawater. The Marabasco sub basin is affected by anthropogenic
contamination through manganese and iron ore mining activities. The obtained knowledge regarding sources and areas of contamination
will be essential for the development and design of a water quality monitoring program in the study area. 相似文献
13.
Before the 20th century, groundwater circulation in the aquifers of the British Isles had largely adjusted to the temperate maritime climate and sea levels established over the past 10 ka since the end of the Pleistocene. However, in the last 100 a this natural regime has been disturbed by abstraction of water for public supply and industrial use, and palaeowaters from earlier recharge episodes are now becoming a factor to be considered in water balance estimates. This paper presents a synthesis of the existing palaeowater distribution in the British Isles, based on isotopic evidence (δ18O, δ2H and and14C). As such, it has relevance to palaeoclimatic studies in addition to the water resource implications.The Triassic basins of England and Northern Ireland contain saline waters beyond the range14C dating (>; 40 ka). Stable isotopic ratios show enrichment in some basins and depletion in others, without an overall pattern that would explain all the observed compositions. The results for the Wessex basin suggest recharge in pre-Quaternary times, but for the other basins some flushing by Pleistocene or Holocene meteoric waters is indicated. Isolated occurrences of apparently long-residence waters are found elsewhere throughout the British Isles, for example from Carboniferous and Lower Palaeozoic strata. In such cases, environmental isotopes are more useful as constraints on hydrogeological models than as indicators of palaeoconditions.Major water supply aquifers are restricted almost entirely to England. The two sandstone formations (Triassic Sherwood Sandstone and Cretaceous Lower Greensand) have a greater range of stable isotopic values between phreatic and confined conditions than the two carbonate formations (Jurassic Lincolnshire Limestone and Cretaceous Chalk). This indicates that the sandstone aquifers are better archives of information on palaeoconditions than the carbonate aquifers. They show that atmospheric circulation patterns over Britain have probably remained the same since the late Pleistocene. However,14C data from all four of the major aquifers emphasise the hiatus in recharge during periglacial conditions which occurred between the late Pleistocene and early Holocene. 相似文献
14.
Identifying the recharge sources and age of groundwater in the Songnen Plain (Northeast China) using environmental isotopes 总被引:5,自引:0,他引:5
The recharge sources and groundwater age in the Songnen Plain, Northeast China, were confirmed using environmental isotopes. The isotopic signatures of the unconfined aquifers in the southeast elevated plain and the north and west piedmont, cluster along local meteoric water lines (LMWLs) with a slope of about 5. The signature of source water was obtained by the intersection of these LMWLs with the regional meteoric water line (RMWL). This finding provides evidence that the recharge water for these areas originate from the Changbai Mountains and the Low and High Hingan Mountains, respectively. Groundwater in the unconfined aquifer in the low plain yields a LMWL with a slope of 4.4; its nitrate concentration indicates the admixture of irrigation return flow. The δ-values of the unconfined aquifer in the east elevated plain plot along the RMWL, reflecting recharge by local precipitation. The mean residence time of groundwater in these aquifers is less than 50?years. However, the 14C age of the groundwater in the confined Quaternary aquifer ranges from modern to 19,500?years, and in the Tertiary confined aquifer from 3,100 to 24,900?years. Modern groundwater is mainly recharged to the Quaternary confined aquifer on the piedmont by local precipitation and lateral subsurface flow. 相似文献
15.
Origin and recharge estimates of groundwater in the ordos plateau,People’s Republic of China 总被引:5,自引:3,他引:2
Groundwater is a valuable resource in the semiarid Ordos Plateau region where abundant mineral resources, such as coal, natural
gas, and halite, are present. With resources development, groundwater demand will increase dramatically. The origin identification
and recharge estimates of groundwater are significant components of sustainable groundwater development in the Ordos Plateau.
Groundwater and precipitation samples were taken and the isotopic compositions δ2H, δ18O, and chloride were analyzed to identify groundwater origins and to estimate recharge rates. The δ2H and δ18O of the groundwater show that the groundwater recharge is of meteoric origin. The chloride mass balance (CMB) method was
used to quantify recharge rates of groundwater in the Ordos Plateau, which varies from 2.93 to 22.11% of the effective annual
rainfall. Recharge rates estimated by CMB were compared with values obtained from other methods and were found to be in good
agreement. This study can be used to develop effective programs for groundwater management and development. 相似文献
16.
J. S. Chen X. X. Sun W. Z. Gu H. B. Tan W. B. Rao H. Z. Dong X. Y. Liu Z. G. Su 《Geochemistry International》2012,50(5):455-465
Despite its extreme aridity, the Badain Jaran Desert is rich in groundwater. In the southeastern part of the desert, it is
characterized by coexistence of high megadunes and a great number of lakes. Deuterium and oxygen 18 isotope compositions as
well as hydrochemistry of groundwater, lake water, soil water and river water were investigated in detail to gain an insight
into their relationships and the origin of the ground-water. The results show that the groundwater and the lake water are
genetically related, but unrelated to local precipitation and the leakage of Heine River at northern slope of Qilian mountain.
δD and δ18O values of deep soil water (lower than 40 cm) and groundwater plot on the same evaporation line E11, which shows that they
have the same recharge source. The point of intersection between E11 and LMWL suggests that the groundwater originates from
the water resource which has a weighted mean value that is lighter by some 6‰ δ18O than the local precipitation in Badain Jaran Desert. 3H data of water samples shows that the groundwater in Badain Jaran Desert originates from the water recharged after the nuclear
test. The deep fault zone underground maybe the water circulation channel based on Helium analysis of groundwater. The result
has guiding significance to rational exploitation and utilization of the local groundwater. 相似文献
17.
L. V. Zamana 《Doklady Earth Sciences》2012,442(1):81-85
The negative correlation between values δD and δ18O and concentrations of dissolved silicon in nitrogen hot springs is ascertained, which attests to the directed alteration
of their hydroisotopic composition towards being depleted in heavy isotopes during interaction in the water-rock system. This
fact can be allowed for the cases of the lighter isotopic composition of the hot springs of meteogenic origin relative to
that of local atmospheric precipitation. The shifts in points of isotopic composition of hot springs from the global meteoric
water line can be caused by alterations in either oxygen or hydrogen composition. 相似文献
18.
Recharge rate estimation in the Mountain karst aquifer system of Figeh spring, Syria 总被引:3,自引:1,他引:2
A. Al-Charideh 《Environmental Earth Sciences》2012,65(4):1169-1178
Figeh watershed spring is one of the important groundwater aquifer, which is considered a major source for drinking waters
of Damascus city and countryside. The origin identification and recharge estimates of groundwater are significant components
of sustainable groundwater development in this Mountain karst aquifer of Figeh spring. During the period 2001–2009, monthly
groundwater and precipitation samples were taken and the isotopic compositions of δ18O, δ2H, and chloride contents were analyzed to identify groundwater origins and to estimate recharge rates. The δ18O, δ2H of the groundwater show that the groundwater recharge is of meteoric origin. The chloride mass balance (CMB) method was
used to quantify recharge rates of groundwater in the Mountain karst aquifer of Figeh spring. The recharge rate varies from
192 to 826 mm/year, which corresponds to 43 and 67% of the total annual rainfall. Recharge rates estimated by CMB were compared
with values obtained from other methods and were found to be in good agreement. This study can be used to develop effective
programs for groundwater management and development. 相似文献
19.
20.
Recharge source and hydrogeochemical evolution of shallow groundwater in a complex alluvial fan system,southwest of North China Plain 总被引:4,自引:0,他引:4
Fadong Li Guoying Pan Changyuan Tang Qiuying Zhang Jingjie Yu 《Environmental Geology》2008,55(5):1109-1122
Many cities around the world are developed at alluvial fans. With economic and industrial development and increase in population,
quality and quantity of groundwater are often damaged by over-exploitation in these areas. In order to realistically assess
these groundwater resources and their sustainability, it is vital to understand the recharge sources and hydrogeochemical
evolution of groundwater in alluvial fans. In March 2006, groundwater and surface water were sampled for major element analysis
and stable isotope (oxygen-18 and deuterium) compositions in Xinxiang, which is located at a complex alluvial fan system composed
of a mountainous area, Taihang Mt. alluvial fan and Yellow River alluvial fan. In the Taihang mountainous area, the groundwater
was recharged by precipitation and was characterized by Ca–HCO3 type water with depleted δ18O and δD (mean value of −8.8‰ δ18O). Along the flow path from the mountainous area to Taihang Mt. alluvial fan, the groundwater became geochemically complex
(Ca–Na–Mg–HCO3–Cl–SO4 type), and heavier δ18O and δD were observed (around −8‰ δ18O). Before the surface water with mean δ18O of −8.7‰ recharged to groundwater, it underwent isotopic enrichment in Taihang Mt. alluvial fan. Chemical mixture and ion
exchange are expected to be responsible for the chemical evolution of groundwater in Yellow River alluvial fan. Transferred
water from the Yellow River is the main source of the groundwater in the Yellow River alluvial fan in the south of the study
area, and stable isotopic compositions of the groundwater (mean value of −8.8‰ δ18O) were similar to those of transferred water (−8.9‰), increasing from the southern boundary of the study area to the distal
end of the fan. The groundwater underwent chemical evolution from Ca–HCO3, Na–HCO3, to Na–SO4. A conceptual model, integrating stiff diagrams, is used to describe the spatial variation of recharge sources, chemical
evolution, and groundwater flow paths in the complex alluvial fan aquifer system. 相似文献