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Isotope implications of groundwater recharge,residence time and hydrogeochemical evolution of the Longdong Loess Basin,Northwest China

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Journal of Arid Land 2022年第1期14卷 34-55页

作者： LING Xinying MA Jinzhu CHEN Peiyuan LIU Changjie Juske HORITA Key Laboratory of Western China's Environmental System(Ministry of Education) Lanzhou UniversityLanzhou 730000China Department of Geosciences Texas Tech UniversityLubbock TX79409USA

groundwater plays a dominant role in the eco-environmental protection of arid and semi-arid regions.Understanding the sources and mechanisms of groundwater recharge,the interactions between groundwater and surface water and the hydrogeochemical evolution and transport processes of groundwater in the Longdong Loess Basin,Northwest China,is of importance for water resources management in this ecologically sensitive area.In this study,71 groundwater samples(mainly distributed at the Dongzhi Tableland and along the Malian River)and 8 surface water samples from the Malian River were collected,and analysis of the aquifer system and hydrological conditions,together with hydrogeochemical and isotopic techniques were used to investigate groundwater sources,residence time and their associated recharge processes.Results show that the middle and lower reaches of the Malian River receive water mainly from groundwater discharge on both sides of valley,while the source of the Malian River mainly comes from local precipitation.groundwater of the Dongzhi Tableland is of a HCO3-Ca-Na type with low salinity.The reverse hydrogeochemical simulation suggests that the dissolution of carbonate minerals and cation exchange between Ca^(2+),Mg^(2+)and Na+are the main water-rock interactions in the groundwater system of the Dongzhi Tableland.Theδ^(18)O(from-11.70‰to-8.52‰)andδ2H(from-86.15‰to-65.75‰)values of groundwater are lower than the annual weighted average value of precipitation but closer to summer-autumn precipitation and soil water in the unsaturated zone,suggesting that possible recharge comes from the summer-autumn monsoonal heavy precipitation in the recent past(≤220 a).The corrected 14C ages of groundwater range from 3,000 to 25,000 a old,indicating that groundwater was mainly from precipitation during the humid and cold Late Pleistocene and Holocene periods.groundwater flows deeper from the groundwater table and from the center to the east,south and west of the Dongzhi Tableland with estimated migration rate of 1.29-1.43 m/a.

关键词： groundwater recharge hydrogeochemical evolution isotope technology 14C dating paleoclimate residence time Chinese Loess Plateau

Evolution of groundwater recharge-discharge balance in the Turpan Basin of China during 1959-2021

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Journal of Arid Land 2023年第9期15卷 1037-1051页

作者： QIN Guoqiang WU Bin DONG Xinguang DU Mingliang WANG Bo College of Hydraulic and Civil Engineering Xinjiang Agricultural UniversityUrumqi 830052China

groundwater overexploitation is a serious problem in the Turpan Basin,Xinjiang Uygur Autonomous Region of China,causing groundwater level declines and ecological and environmental problems such as the desiccation of karez wells and the shrinkage of lakes.Based on historical groundwater data and field survey data from 1959 to 2021,we comprehensively studied the evolution of groundwater recharge and discharge terms in the Turpan Basin using the groundwater equilibrium method,mathematical statistics,and GIS spatial analysis.The reasons for groundwater overexploitation were also discussed.The results indicated that groundwater recharge increased from 14.58×10^(8)m^(3)in 1959 to 15.69×10^(8)m^(3)in 1980,then continued to decrease to 6.77×10^(8)m^(3)in 2021.groundwater discharge increased from 14.49×10^(8)m^(3)in 1959 to 16.02×10^(8)m^(3)in 1989,while continued to decrease to 9.97×10^(8)m^(3)in 2021.Since 1980,groundwater recharge-discharge balance has been broken,the decrease rate of groundwater recharge exceeded that of groundwater discharge and groundwater recharge was always lower than groundwater discharge,showing in a negative equilibrium,which caused the continuous decrease in groundwater level in the Turpan Basin.From 1980 to 2002,groundwater overexploitation increased rapidly,peaking from 2003 to 2011 with an average overexploitation rate of 4.79×10^(8)m^(3)/a;then,it slowed slightly from 2012 to 2021,and the cumulative groundwater overexploitation was 99.21×10^(8)m^(3)during 1980-2021.This research can provide a scientific foundation for the restoration and sustainable use of groundwater in the overexploited areas of the Turpan Basin.

关键词： groundwater overexploitation groundwater recharge groundwater discharge climate change human activities Turpan Basin

Dynamics of groundwater recharge near a semi-arid Mediterranean intermittent stream under wet and normal climate conditions

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Journal of Arid Land 2022年第7期14卷 739-752页

作者： Youssef HAJHOUJI Younes FAKIR Simon GASCOIN Vincent SIMONNEAUX Abdelghani CHEHBOUNI Faculty of Sciences Semlalia Cadi Ayyad University40000MarrakechMorocco Center for Remote Sensing Application(CRSA) UM6P43150BenguerirMorocco Center for the Study of the Biosphere from Space(CESBIO) 31400ToulouseFrance

In arid and semi-arid stream-dominated systems,the temporal variability in groundwater recharge has not been widely addressed.Various questions remain about the sources of groundwater recharge,its patterns,and the appropriate measuring techniques.Hence,the main objective of the present study was to assess the changes that might affect the pattern of groundwater recharge under wetter than normal surface water availability.Therefore,the groundwater depth was monitored near a semi-arid Mediterranean intermittent stream on the piedmont of the High Atlas Mountains in the mountain catchment of the Wadi Rheraya over two hydrological years(2014-2016)with different climate conditions:extreme wet and normal conditions.groundwater recharge was assessed using the episodic master recession algorithm.During the two years,the pattern of groundwater recharge was dominated by episodic events and by a high seasonality from wet seasons to dry seasons.In the wet year(2014-2015),the highest groundwater recharge was recorded following an extreme flood,which deeply replenished groundwater.Furthermore,an exceptional steady state of the groundwater depth was induced by a steady groundwater recharge rate.For several groundwater recharge events,the assessed recharge had multiple sources,mainly from streamflow at the local scale,but possibly from precipitation,underflow,deep percolation or irrigation return from the upstream part of the catchment.Local recharge by streamflow was likely to be short-lived,and lateral recharge was likely to last longer.Consequently,the episodic master recession algorithm estimated the total groundwater recharge that could encompass various sources.In the future,more studies and multidisciplinary approaches should be carried out to partition these sources and determine their specific contributions.In semi-arid stream-dominated systems,different groundwater recharge patterns induced by extreme hydrological events(e.g.,wet events)and various potential sources of groundwater recharge should be considered when asse

关键词： groundwater recharge water table fluctuation episodic master recession algorithm episodic recharge wet year Wadi Rheraya Citation:Youssef HAJHOUJI

Optimizing groundwater recharge plan in North China Plain to repair shallow groundwater depression zone, China

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Journal of groundwater Science and Engineering 2023年第2期11卷 133-145页

作者： Rui-fang Meng Hui-feng Yang Xi-lin Bao Bu-yun Xu Hua Bai Jin-cheng Li Ze-xin Liang Institute of Hydrogeology and Environmental Geology Chinese Academy of Geological SciencesShijiazhuang 050061China National Field Scientific Observation and Research Station on groundwater and Ground Subsidence in the Plain Area of Cangzhou 050061 HebeiChina Shuifa Planning and Design Co. Ltd.Jinan 250100China Hebei Hydraulic Research Institute Shijiazhuang 050057China

The North China Plain is one of the main grain producing areas in China. However, overexploitation has long been unsustainable since the water supply is mainly from groundwater. Since 2014,the South-to-North Water Diversion Project's central route has been charted to the integrated management of water supply and over-exploitation, which has alleviated the problem to a certain extent. Although the Ministry of Water Resources has made many efforts on groundwater recharge since 2018 most of which have been successful, the recharge has not yet been sufficiently focused on the repair of shallow groundwater depression zones. It still needs further optimization. This paper discusses this particular issue,proposes optimized recharge plan and provides the following recommendations:(1) Seven priority target areas are selected for groundwater recharge in alluvial and proluvial fans in the piedmont plain, and the storage capacity is estimated to be 181.00×10~8 m~3;(2) A recharge of 31.18×10~8 m~3/a is required by 2035 to achieve the repair target;(3) It is proposed to increase the recharge of Hutuo River, Dasha River and Tanghe River to 19.00×10~8 m~3/a and to rehabilitate Gaoliqing-Ningbailong Depression Zone;increase the recharge of Fuyang River, Zhanghe River and Anyang River to 7.05×10~8 m~3/a and rehabilitate Handan Feixiang-Guangping Depression Zone;increase the recharge of Luanhe River by 0.56×10~8 m~3/a and restore Tanghai Depression Zone and Luanan-Leting Depression Zone;moderately reduce the amount of water recharged to North Canal and Yongding River to prevent excessive rebound of groundwater;(4) recharge through well is implemented on a pilot basis in areas of severe urban ground subsidence and coastal saltwater intrusion;(5) An early warning mechanism for groundwater quality risks in recharge areas is established to ensure the safety. The numerical groundwater flow model also proves reasonable groundwater level restoration in the depression zones by 2035.

关键词： North China Plain groundwater recharge groundwater depression zone recharge target areas Storage capacity recharge source recharge effectiveness

groundwater recharge and Mixing in Arid and Semiarid Regions:Heihe River Basin,Northwest China

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Acta Geologica Sinica(English Edition) 2016年第3期90卷 971-987页

作者： CAO Guoliang ZHENG Chunmiao Craig T.SIMMONS Institute of Water Sciences Peking UniversityBeijing 100871China School of the Environment&National Centre for groundwater Research and Training Adelaide SA 5001Australia School of Environmental Science and Engineering South University of Science and Technology of ChinaShenzhen 518055China Department of Geological Sciences University ofAlabamaTuscaloosaAlabama 35487USA

A sound understanding of groundwater recharged from various sources occurring at different time scales is crucial for water management in arid and semi-arid river basins. groundwater recharge sources and their geochemical evolution are investigated for the Heihe River Basin （HRB） in northwest China on the basis of a comprehensive compilation of geochemical and isotopic data. Geochemical mass- balance modeling indicates that mountain-block recharge accounts for a small fraction （generally less than 5%） of the shallow and deep groundwater sustaining the oasis, whereas infiltration of rivers and irrigation water contribute most of the groundwater recharge. Dedolomitization is the primary process responsible for the changes in groundwater chemical and carbon isotope compositions from the piedmont to the groundwater discharge zone, where the dedolomitization is very likely enhanced by modern agricultural activities affecting the shallow groundwater quality. Analysis of radioactive isotopes suggests that these primary recharge sources occur at two different time scales. Radiocarbon-derived groundwater age profiles indicate a recharge rate of approximately 12 mm/year, which probably occurred during 2000-7000 years B.P., corresponding to the mid-Holocene humid period. The recharge of young groundwater on the tritium-dated time scale is much higher, about 360 mm/year in the oasis region. Infiltration from irrigation canals and irrigation return flow are the primary contributors to the increased young groundwater recharge. This study suggests that groundwater chemistry in the HRB has been influenced by the complex interaction between natural and human-induced geochemical processes and that anthropogenic effects have played a more significant role in terms of both groundwater quantity and quality.

关键词： Heihe River Basin groundwater recharge groundwater mixing isotope hydrology

17α-Ethynylestradiol biodegradation in different river-based groundwater recharge modes with reclaimed water and degradation-associated community structure of bacteria and archaea

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Journal of Environmental Sciences 2018年第2期30卷 51-61页

作者： Weifang Ma Jiaji Sun Yangyao Li Xiaoxiu Lun Dan Shan Chao Nie Miaomiao Liu College of Environmental Science and Engineering Beijing Forestry University Beijing 100083 China Friendship Center for Environmental Protection Beijing 100029 China Department of Civil and Environmental Engineering university of Illinois at Urbana-Champaign Urbana IL 61801-2352 USA

This study investigated 17α-ethynylestradiol（EE2） biodegradation process and primary metabolic pathways associated with community structures of microorganism during groundwater recharge using reclaimed water. The attenuation rate is 1.58 times higher in wetting and drying alternative recharge（WDAR） than in continual recharge（CR）. The primary biotransformation pathways of EE2 in WDAR system began with the oxidation of C-17 on ring D to form a ketone group, and D-ring was subsequently hydroxylated and cleaved. In the CR system, the metabolic pathway changed from the oxidation of C-17 on ring D to hydroxylation of C-4 on ring A, and ring A or B subsequently cleaved; this transition was related to DO, and the microbial community structure. Four hundred fifty four pyrosequencing of 16 s r RNA genes indicated that the bacterial communities in the upper layer of the WDAR system were more diverse than those found in the bottom layer of the CR system; this result was reversed for archaea. Unweighted Uni Frac and taxonomic analyses were conducted to relate the change in bacterial community structure to the metabolic pathway. Microorganism community diversity and structure were related to the concentrations of dissolved oxygen, EE2 and its intermediates in the system. Five known bacterial classes and one known archaeal class, five major bacterial genera and one major archaeal genus might be involved in EE2 degradation. The findings of this study provide an understanding of EE2 biodegradation in groundwater recharge areas under different recharging modes and can facilitate the prediction of the fate of EE2 in underground aquifers.

关键词： EE2 Biodegradation groundwater recharge Microbial community and diversity Metabolic intermediates

An approach to delineate groundwater recharge potential sites in Ambalantota,Sri Lanka using GIS techniques

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Geoscience Frontiers 2016年第1期7卷 115-124页

作者： i.p.senanayake d.m.d.o.k.dissanayake b.b.mayadunna w.l.weerasekera Department of Earth Resources Engineering University of Moratuwa MoratuwaSri Lanka

The demand for fresh water in Hambantota District, Sri Lanka is rapidly increasing with the enormous amount of ongoing development projects in the region. Nevertheless, the district experiences periodic water stress conditions due to seasonal precipitation patterns and scarcity of surface water resources.Therefore, management of available groundwater resources is critical, to fulfil potable water requirements in the area. However, exploitation of groundwater should be carried out together with artificial recharging in order to maintain the long term sustainability of water resources. In this study, a GIS approach was used to delineate potential artificial recharge sites in Ambalantota area within Hambantota. Influential thematic layers such as rainfall, lineament, slope, drainage, land use/land cover, lithology, geomorphology and soil characteristics were integrated by using a weighted linear combination method. Results of the study reveal high to moderate groundwater recharge potential in approximately 49% of Ambalantota area.

关键词： GIS groundwater recharge Water management Weighted overlay Sri Lanka

Quantification of groundwater recharge and evapotranspiration along a semi-arid wetland transect using diurnal water table fluctuations

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Journal of Arid Land 2021年第5期13卷 455-469页

作者： JIA Wuhui YIN Lihe ZHANG Maosheng ZHANG Xinxin ZHANG Jun TANG Xiaoping DONG Jiaqiu School of Water Resources and Environment China University of Geosciences(Beijing)Beijing 100083China Xi'an Center of Geological Survey China Geological SurveyXi'an 710054China Institute of Disaster Prevention and Ecological Restoration Xi'an Jiaotong UniversityXi'an 710049China Chinese Academy of Geological Sciences Beijing 100037China

groundwater is a vital water resource in arid and semi-arid areas.Diurnal groundwater table fluctuations are widely used to quantify rainfall recharge and groundwater evapotranspiration(ET_(g)).To assess groundwater resources for sustainable use,we estimated groundwater recharge and ET_(g) using the diurnal water table fluctuations at three sites along a section with different depths to water table(DWT)within a wetland of the Mukai Lake in the Ordos Plateau,Northwest China.The water table level was monitored at an hourly resolution using a Keller DCX-22 A data logger that measured both the total pressure and barometric pressure,so that the effect of barometric pressure could be removed.At this study site,a rapid water table response to rainfall was observed in two shallow wells(i.e.,Obs1 and Obs2),at which diurnal water table fluctuations were also observed over the study period during rainless days,indicating that the main factors influencing water table variation are rainfall and ET_(g).However,at the deep-water table site(Obs3),the groundwater level only reacted to the heaviest rainfalls and showed no diurnal variations.groundwater recharge and ET_(g) were quantified for the entire hydrological year(June 2017–June 2018)using the water table fluctuation method and the Loheide method,respectively,with depth-dependent specific yields.The results show that the total annual groundwater recharge was approximately 207 mm,accounting for 52%of rainfall at Obs1,while groundwater recharge was approximately 250 and 21 mm at Obs2 and Obs3,accounting for 63%and 5%of rainfall,respectively.In addition,the rates of groundwater recharge were mainly determined by rainfall intensity and DWT.The daily mean ET_(g) at Obs1 and Obs2 over the study period was 4.3 and 2.5 mm,respectively,and the main determining factors were DWT and net radiation.

关键词： groundwater recharge groundwater evapotranspiration water table fluctuation semi-arid region Ordos Plateau

Using EARTH Model to Estimate groundwater recharge at Five Representative Zones in the Hebei Plain, China

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Journal of Earth Science 2015年第3期26卷 425-434页

作者： Bingguo Wang Menggui Jin Xing Liang School of Environmental Studies China University of Geosciences State Key Laboratory of Biogeology and Environmental Geology China University of Geosciences

Accurate estimation of groundwater recharge is essential for efficient and sustainable groundwater management in many semi-arid regions. In this paper, a lumped parameter model（EARTH） was established to simulate the recharge rate and recharge process in typical areas by the observation datum of weather, soil water and groundwater synthetically, and the spatial and temporal variation law of groundwater recharge in the Hebei Plain was revealed. The mean annual recharge rates at LQ, LC, HS, DZ and CZ representative zones are 220.1, 196.7, 34.1, 141.0 and 188.0 mm/a and the recharge coefficients are 26.5%, 22.3%, 7.2%, 20.4%, and 22.0%, respectively. recharge rate and recharge coefficient are gradually reduced from piedmont plain to coastal plain. groundwater recharge appears as only yearly waves, with higher frequency components of the input series filtered by the deep complicated unsaturated zone（such as LC）. While at other zones, groundwater recharge series strongly dependent on the daily rainfall and irrigation because of the shallow water table or coarse lithology.

关键词： EARTH model groundwater recharge Hebei Plain