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Unraveling the hydraulic properties of loess for landslide prediction:A study on variations in loess landslides in Lanzhou,Dingxi,and Tianshui,China

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China Geology 2024年第2期7卷 291-302页

作者： Gao-chao Lin Wei Liu Xing Su School of Civil and Environmental engineering University of New South WalesSydneyNSW 2052Australia Institute of Transportation Inner Mongolia UniversityHohhot 010070China Institute of Geological Hazards Prevention Gansu Academy of SciencesLanzhou 730000China

Loess has distinctive characteristics,leading to frequent landslide disasters and posing serious threats to the lives and properties of local re *** involvement of water repre sents a critical factor in inducing loess *** study focuses on three neighboring cities sequentially situated on the Loess Plateau along the direction of aeolian deposition of loess,namely Lanzhou,Dingxi,and Tianshui,which are densely populated and prone to landslide *** variations in hydraulic properties,including water retention capacity and permeability,are investigated through Soil Water Characteristic Curve(SWCC)test and hydraulic conductivity *** experimental findings revealed that Tianshui loess exhibited the highest water retention capacity,followed by Dingxi loess,while Lanzhou loess demonstrated the lowest water retention ***,the results for the saturated permeability coefficient were found to be the opposite:Tianshui loess showed the lowest permeability,whereas Lanzhou loess displayed the highest *** results are supported and analyzed by scanning electron microscopy(SEM)*** addition,the water retention capacity is mathematically expressed using the van Genuchten model and extended to predict unsaturated hydraulic properties of *** experimental results exhibit a strong accordance with one another and align with the regional distribution patterns of disasters.

关键词： Loess Landslide Hydraulic properties Water retention capacity and permeability Soil Water Characteristic Curve(SWCC) Hydraulic conductivity Van Genuchten model hydrogeological engineering Geological hazards prevention engineering

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Biophysical warming patterns of an open-top chamber and its short-term influence on a Phragmites wetland ecosystem in China

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China Geology 2023年第4期6卷 594-610页

作者： Xue-yang Yu Si-yuan Ye Li-xin Pei Liu-juan Xie Ken W.Krauss Samantha K.Chapman Hans Brix Key Laboratory of Coastal Wetland Biogeosciences Qingdao Institute of Marine GeologyChina Geological SurveyMinistry of Natural ResourcesQingdao 266071China Institute of Marine Science and Technology Shandong UniversityQingdao 266237China Wetland and Aquatic Research Center U.S.Geological SurveyLafayette 70506United States of America Department of Biology Villanova UniversityVillanova 19085United States of America Department of Biology Aarhus UniversityAarhus 8000CDenmark

Passive-warming, open-top chambers(OTCs) are widely applied for studying the effects of future climate warming on coastal wetlands. In this study, a set of six OTCs were established at a Phragmites wetland located in the Yellow River Delta of Dongying City, China. With data collected through online transmission and in-situ sensors, the attributes and patterns of realized OTCs warming are *** authors also quantified the preliminary influence of experimental chamber warming on plant *** produced an elevated average air temperature of 0.8°C(relative to controls) during the growing season(June to October) of 2018, and soil temperatures actually decreased by 0.54°C at a depth of 5 cm and 0.46°C at a depth of 30 cm in the OTCs. Variations in diel patterns of warming depend greatly on the heat sources of incoming radiation in the daytime versus soil heat flux at night. Warming effects were often larger during instantaneous analyses and influenced OTCs air temperatures from-2.5°C to 8.3°C dependent on various meteorological conditions at any given time, ranging from cooling influences from vertical heat exchange and vegetation to radiation-associated warming. Night-time temperature depressions in the OTCs were due to the low turbulence inside OTCs and changes in surface soilatmosphere heat transfer. Plant shoot density, basal diameter, and biomass of Phragmites decreased by23.2%, 6.3%, and 34.0%, respectively, under experimental warming versus controls, and plant height increased by 4.3%, reflecting less carbon allocation to stem structures as plants in the OTCs experienced simultaneous wind buffering. While these passive-warming OTCs created the desired warming effects both to the atmosphere and soils, pest damages on the plant leaves and lodging within the OTCs were extensive and serious, creating the need to consider control options for these chambers and the replicated OTCs studies underway in other Chinese Phragmites marshes(Panjin and Yancheng).

关键词： Open-top chambers(OTCs)warming Phragmites australis wetland Short-term ecosystem impact Climate warming Soil heat flux Soil-atmosphere heat transfer Ecological geological engineering hydrogeological engineering Yellow River Delta

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The distribution and ecological risks of antibiotics in surface water in key cities along the lower reaches of the Yellow River:A case study of Kaifeng City,China

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China Geology 2022年第3期5卷 411-420页

作者： Dun-yu Lü Chu Yu Zi-jun Zhuo Shu-ran Meng Song-bo Liu Institute of Hydrogeology and Environmental Geology Chinese Academy of Geological SciencesShijiazhuang 050061China Key Laboratory of Groundwater Sciences and engineering Ministry of Natural ResourcesZhengding 050803China China University of Geosciences(Beijing) Beijing 100083China

A large number of antibiotics have been discharged into rivers by human activities,posing a threat to aquatic *** surface water of the Yellow River Basin also suffers antibiotic pollution,which hinders the improvement in the aquatic ecological *** study investigated and analyzed the characteristics and assessed the ecological risks of antibiotic pollution in surface water bodies such as canals,rivers and fish ponds in Kaifeng,Henan Province,which is a key city along the lower reaches of the Yellow *** test results are as follows.A total of 15 types of antibiotics were detected in the surface *** had a total antibiotic concentration of 12.2-249.9μg/L,of which tetracyclines(TCs)and quinolones accounted for the highest *** types of quinolones had detection rates of up to 100%,and doxycycline(DC)and oxytetracycline(OTC)had average concentrations of 29.52μg/L1 and 13.71μg/L,*** major canals with water diverted from the Yellow River had total concentrations of quinolones and TCs of 22.0μg/L and 14.9μg/L,respectively,which were higher than those in previous *** phenomenon may be related to the decrease in the water flow of the Yellow River during the dry season and the increase in the antibiotic consumption of residents in the context of the Covid-19 *** upper reaches of the Huiji River in the Xiangfu District had higher antibiotic content than other districts in ***,TCs accounted for 72.38%-91.84%of all antibiotics,and the DC and OTC concentrations were significantly higher than other antibiotics in the upper *** indicated by the ecological risk assessment results,TCs had the highest ecological risks to green *** them,DC had medium-high risks;TC,OTC,and chlortetracycline(CTC)had medium-high risks;trimethoprim(TMP)and lomefloxacin(LOM)had low risks;other TC antibiotics had no *** with green algae,most antibiotics showed higher ecological risks to daphni

关键词： Surface water Antibiotics COVID-19 epidemic Distribution characteristic Ecological risk hydrogeological engineering Kaifeng City Yellow River China A

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Microplastic contamination in lacustrine sediments in the Qinghai-Tibet Plateau:Current status and transfer mechanisms

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China Geology 2022年第3期5卷 421-428页

作者： Rui-ping Liu Fei Liu Ying Dong Jian-gang Jiao El-Wardany RM Li-feng Zhu Xi’an center China Geological SurveyMinistry of Natural ResourcesXi’an 710054China Shaanxi Province Water Resources and Environment engineering Technology Research Center Xi’an 710054China Western Green Development Research Institute China Geological SurveyXi’an 710054China Key Laboratory for Geo-hazards in Loess Area Ministry of Natural ResourcesXi’an 710054China Field Base of Scientific Observation of Shaanxi Tongguan Ministry of Natural ResourcesXi’an 710054China Dalian Ocean and Fishery Comprehensive Administration Supervision Lochus Dalian 116000China Key Laboratory of Western China’s Mineral Resource and Geological engineering Ministry of EducationXi’an 710054China School of Earth Science and Land Resources of Chang’an University Xi’an 710054China Assiut Branch Al-Azhar UniversityAssiut 71524Egypt

This paper aims to investigate the present situation and transfer mechanisms of microplastics in lacustrine sediments in the Qinghai-Tibet *** study surveyed the average abundance of microplastics in *** abundance of microplastics in sediments of lakes from the Qinghai-Tibet Plateau is 17.22-2643.65 items/kg DW and 0-60.63 items/kg DW based on the data of the Qinghai Lake and the Siying Co *** microplastic abundance in sediments from small and medium lakes is very high compared to that in other areas in the *** microplastics in other lakes of the world,those in the lakes in the Qinghai-Tibet Plateau mainly include organic polymers PA,PET,PE,and PP and are primarily in the shape of fibers and *** microplastic pollution of lacustrine sediments in the Qinghai-Tibet Plateau is affected by natural changes and by human activities,and the concentration of microplastics in lacustrine ecosystems gradually increases through food ***,the paper suggests the relevant administrative departments of the Qinghai-Tibet Plateau strengthen waste management while developing tourism and pay much attention to the impacts of microplastics in water *** study provides a reference for preventing and controlling microplastic contamination in the Qinghai-Tibet Plateau.

关键词： Microplastic pollution Environmental pollution Lake Lacustrine sediment Qinghai Lake Ecological risks hydrogeological engineering Ecological engineering Qinghai-Tibet Plateau China

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Microplastic pollution in Yellow River,China:Current status and research progress of biotoxicological effects

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China Geology 2021年第4期4卷 585-592页

作者： Rui-ping Liu Zhi-zhong Li Fei Liu Ying Dong Jian-gang Jiao Ping-ping Sun El-Wardany RM Xi’an Center China Geological SurveyMinistry of Natural ResourcesXi’an 710054China Western Green Development Research Institute ChinaGeological SurveyXi’an 710054China Key Laboratory for Geo-hazards in Loess area Ministry of Natural ResourcesXi’an 710054China Field Base of Scientific Observation of Shannxi Tongguan Ministry of Natural ResourcesXi’an 710054China Dalian Ocean and Fishery Comprehensive Administration Enforcement Team Dalian 116000China School of Earth Science and Land Resources of Chang’an University Xi’an 710054China Al-Azhar University Assiut 71524Egypt

This study aims to comprehensively assess the environmental risks of microplastics in the Yellow River,achieving the following results through comprehensive *** average microplastic abundances in the river waters and sediments are 5358-654000 n/m3 and 43.57-615 items/kg,respectively,and there are fewer microplastics in water samples than in *** in the study area can be divided into five types according to their occurrence morphologies,namely fragments,foams,films,fibers,and *** most widely distributed pollution types in sediments include debris,fibers,and *** contrast,fibers are the dominant type in water samples,accounting for 68.18%‒98.93%.The chemical components of the microplastics include polyethylene,polypropylene,polystyrene,polyethylene terephthalate,and polyvinyl *** microplastics are in four colors,with white accounting for a higher *** grain size of the microplastics in tributaries or lakes of the Yellow River is less than 2 mm,which makes them liable to enter organisms for ***,the sources of the microplastics are closely related to agricultural and industrial production and biological activities in habitats and exhibit seasonal and hydrological *** microplastics in the study area show the adsorption of metals and nonmetals to different degrees,which increases the pollution risks of heavy metals combined with *** addition,microplastics can accumulate in organisms in the Yellow River and cause physical,biochemical,and other damage to aquatic organisms,thus further posing carcinogenic risks to human ***,it is necessary to study,monitor,and control the pollution and effects of microplastics in the Yellow River,in order to provide theoretical references for the control of pollution and ecological risk of microplastics in the river.

关键词： Microplastic pollution Influence factor Biotoxicological effects hydrogeological engineering Ecological engineering Yellow River China

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Sediment distribution characteristics and environment evolution within 100 years in western Laizhou Bay,Bohai Sea,China

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China Geology 2020年第3期3卷 445-454页

作者： Mao-sheng Gao Guo-hua Hou Xian-zhang Dang Xue-yong Huang Key Laboratory of Coastal Wetland Biogeosciences Qingdao Institute of Marine GeologyChina Geological SurveyMinistry of Natural ResourcesQingdao 266071China Laboratory for Marine Mineral Resources Pilot National Laboratory for Marine Science and TechnologyQingdao 266071China China University of Geoscience Wuhan 430074China

This study is about the reconstruction of fluvial origins based on the grain size distribution of sediment deposits in the western Laizhou Bay,Bohai Sea,*** sediment cores were selected to research sediment characteristics using the Sahu discriminant formula,C-M diagram,and Folk *** results showed:(1)Bounded by the Guangli River estuary,the north sediment was affected by the water and sand flowing from the Yellow River during different *** south sediment came from multi-source rivers under the influence of the Xiaoqing River,Mihe River,and other coastal rivers;(2)the deposited sediments were dated by a clear historical record of the branched channel oscillation combined with the characteristics of the diversion channel,erosion,and *** subaqueous delta overlapped during several Yellow River channel runs(1897–1904,1929–1934,1938–1947,1947–1953,1976–1996)and the deposited sediment facies changed(the north tidal flat-abandoned subaqueous delta-lateral delta-delta front);(3)the deposited sediment characteristics can be revealed by studying the branched diversions of the Yellow River and coastal multi-rivers of the past one hundred years.

关键词： Sediment Grain size Silt Environment evolution Distribution characteristic hydrogeological engineering Laizhou Bay Qingdao City China

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