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Extreme Flood Events over the Past 300 Years Inferred from Lake Sedimentary Grain Sizes in the altay mountains,Northwestern China

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Chinese Geographical Science 2018年第5期28卷 773-783页

作者： ZHOU Jianchao WU Jinglu ZENG Haiao State Key Laboratory of Lake Science and Environment Nanjing Institute of Geography and Limnology Chinese Academy of Sciences Nanjing 210008 China University of Chinese Academy of Sciences Beijing 100049 China Research Center for Ecology and Environment of Central Asia Chinese Academy of Sciences Urumqi 830011 China

Understanding the temporal variations of extreme floods that occur in response to climate change is essential to anticipate the trends in flood magnitude and frequency in the context of global warming. However, long-term records of paleofloods in arid regions are scarce, thus preventing a thorough understanding of such events. In this study, a reconstruction of paleofloods over the past 300 years was conducted through an analysis of grain sizes from the sediments of Kanas Lake in the altay mountains of northwestern China. Results showed that grain parameters and frequency distributions can be used to infer possible abrupt environmental events within the lake sedimentary sequence, and two extreme flood events corresponding to ca. 1736–1765 AD and ca. 1890 AD were further identified based on canonical discriminant analysis(CDA) and coarse percentile versus median grain size(C-M) pattern analysis, both of which occurred during warmer and wetter climate conditions by referring to tree-ring records. These two flood events are also evidenced by lake sedimentary records in the altay and Tianshan mountains. Furthermore, through a comparison with other records, the flood event from ca. 1736–1765 AD in the study region seems to have occurred in both the arid central Asia and the Alps in Europe, and thus may have been associated with changes in the North Atlantic Oscillation(NAO) index.

关键词： flood events grain size Kanas Lake altay mountains North Atlantic Oscillation(NAO)

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Environmental significance and hydrochemical characteristics of rivers in the western region of the altay mountains,China

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Journal of Arid Land 2023年第9期15卷 1052-1066页

作者： LIU Shuangshuang WANG Feiteng XU Chunhai WANG Lin LI Huilin State Key Laboratory of Cryospheric Science Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China University of Chinese Academy of Sciences Beijing 100049China

Analysis of environmental significance and hydrochemical characteristics of river water in mountainous regions is vital for ensuring water *** this study,we collected a total of 164 water samples in the western region of the altay mountains,China,in *** used principal component analysis and enrichment factor analysis to examine the chemical properties and spatiotemporal variations of major ions(including F-,Cl-,NO_(3)-,SO_(4)^(2-),Li+,Na+,NH4+,K+,Mg^(2+),and Ca^(2+))present in river water,as well as to identify the factors influencing these ***,we assessed the suitability of river water for drinking and irrigation purposes based on the total dissolved solids,soluble sodium percentage,sodium adsorption ratio,and total *** revealed that river water had an alkaline aquatic environment with a mean pH value of *** mean ion concentration was ranked as follows:Ca^(2+)>SO_(4)^(2-)>Na+>NO_(3)->Mg^(2+)>K+>Cl->F->NH_(4)+>Li+.Ca^(2+),SO_(4)^(2-),Na+,and NO_(3)-occupied 83%of the total ion *** addition,compared with other seasons,the spatial variation of the ion concentration in spring was *** analysis of the sources of major ions revealed that these ions originated mainly from carbonate dissolution and silicate *** recharge impact of precipitation and snowmelt merely influenced the concentration of Cl-,NO_(3)-,SO_(4)^(2-),Ca^(2+),and Na+.Overall,river water was in pristine condition in terms of quality and was suitable for both irrigation and *** study provides a scientific basis for sustainable management of water quality in rivers of the altay mountains.

关键词： environmental significance hydrochemical characteristics water quality soluble sodium percentage(SSP) ion concentration altay mountains

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Oxygen and hydrogen isotope characteristics of different water bodies in the Burqin River Basin of the altay mountains,China

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Journal of Arid Land 2024年第10期16卷 1365-1379页

作者： XIE Yida WANG Feiteng LIU Shuangshuang Key Laboratory of Cryospheric Science and Frozen Soil Engineering Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China University of Chinese Academy of Sciences Beijing 100049China

Characterization of the spatial and temporal variability of stable isotopes in surface water is essential for interpreting hydrological *** this study,we collected the water samples of river water,groundwater,and reservoir water in the Burqin River Basin of the altay mountains,China in 2021,and characterized the oxygen and hydrogen isotope variations in different water bodies via instrumental analytics and *** showed significant seasonal variations in stable isotope ratios of oxygen and hydrogen(δ18O andδ2H,respectively)and significant differences inδ18O andδ2H among different water ***δ18O andδ2H values were mainly found in river water,while groundwater and reservoir water had lower isotope *** water and groundwater showed differentδ18O-δ2H relationships with the local meteoric water line,implying that river water and groundwater are controlled by evaporative enrichment and multi-source recharge *** evaporative enrichment experienced by reservoir water was less significant and largely influenced by topography,recharge sources,local moisture cycling,and anthropogenic *** deuterium excess(d-excess)value of 14.34‰for river water probably represented the isotopic signature of combined contributions from direct precipitation,snow and glacial meltwater,and groundwater *** average annual d-excess values of groundwater(10.60‰)and reservoir water(11.49‰)were similar to the value of global precipitation(10.00‰).The findings contribute to understanding the hydroclimatic information reflected in the month-by-month variations in stable isotopes in different water bodies and provide a reference for the study of hydrological processes and climate change in the altay mountains,China.

关键词： water bodies stable isotopes deuterium excess(d-excess) Hybrid Single-Particle Lagrangian Integrated Trajectory(HYSPLIT)model Burqin River Basin altay mountains

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A system-integrated approach for the design of tourist areas at the local level under changing conditions:A case study in the altay mountains

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Regional Sustainability 2024年第2期5卷 89-102页

作者： Alexandr Nikolaevich DUNETS Evgeniya Mikhailovna TABAKAEVA HAN Fang Department of Scientific and Innovative Development Altai State UniversityBarnaul656049Russia Department of Recreational Geography ServiceTourism and HospitalityInstitute of GeographyAltai State UniversityBarnaul656049Russia State Key Laboratory of Desert and Oasis Ecology Key Laboratory of Ecological Safety and Sustainable Development in Arid LandsXinjiang Institute of Ecology and GeographyChinese Academy of SciencesUrumqi830011China

The existing approaches for the design of tourist areas often lead to limited flexibility in project *** realize a more flexible approach,in this study,we formulated a model for planning and designing tourist areas at the local ***,specific tools for analyzing tourist areas and ensuring sustainable development under changing conditions were *** study was conducted in two tourist regions,Biryuzovaya Katun tourist complex and Belokurikha destination(including Belokurikha City with Belokurikha 2 Gornaya tourist complex and surrounding areas),in the altay *** employed the recreation opportunity spectrum and proposed a system-integrated programming approach for the design of tourist areas at the destination and site *** key of this approach was the collection and analysis of current spatial data,including the spatial distribution of attractions and visitor *** constructed heat maps using video recording and unmanned aerial vehicle(UAV)observation ***,we analyzed the video stream using an image-analyzing framework You Only Look Once(YOLO)v5 *** heat map of visitor flows based on video recording data in the Andreevskaya Sloboda museum of Belokurikha 2 Gornaya tourist complex allowed us to highlight the most attractive sites in this area and classify them into one of three types:points of functional concentration,points of transitional concentration,and points of *** heat maps in Biryuzovaya Katun tourist complex,created using UAV observation data,allowed us to determine the spatiotemporal patterns of visitor flows and tourists’preferences throughout the day within four time intervals:09:00-12:00,13:00-14:00,14:00-15:00,and 16:00-18:00(LST).The maximum visitor flow density occurred from 16:00 to 18:00 in the beach area of the artificial lake.A comparison between the visitor-concentrated sites and the current facilities provided insights into the demand for attractions and facilities and

关键词： Tourism planning Tourist areas Unmanned aerial vehicle(UAV) Visitor flows Heat map altay mountains

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Reconstruction of hydrological changes based on tree-ring data of the Haba River, northwestern China

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Journal of Arid Land 2018年第1期10卷 53-67页

作者： zhang tongwen yuan yujiang chen feng yu shulong zhang ruibo qin li jiang shengxia institute of desert meteorology china meteorological administrationUrumqi 830002China key laboratory of tree-ring physical and chemical research of china meteorological administration Urumqi 830002China key laboratory of tree-ring ecology of xinjiang uygur autonomous region Urumqi 830002China

Reconstructing the hydrological change based on dendrohydrological data has important implications for understanding the dynamic distribution and evolution pattern of a given river. The widespread, long-living coniferous forests on the altay mountains provide a good example for carrying out the dendrohydrological studies. In this study, a regional composite tree-ring width chronology developed by Lariat sibirica Ledeb. and Picea obovata Ledeb. was used to reconstruct a 301-year annual （from preceding July to succeeding June） streamflow for the Haba River, which originates in the southern altay mountains, Xinjiang, China. Results indicated that the reconstructed streamflow series and the observations were fitting well, and explained 47.5% of the variation in the observed streamflow of 1957-2008. Moreover, floods and droughts in 1949-2000 were precisely captured by the streamflow reconstruction. Based on the frequencies of the wettest/driest years and decades, we identified the 19th century as the century with the largest occurrence of hydrological fluctuations for the last 300 years. After applying a 21-year moving average, we found five wet （1724-1758, 1780-1810, 1822-1853, 1931-1967, and 1986-2004） and four dry （1759-1779, 1811-1821, 1854-1930, and 1968-1985） periods in the streamflow reconstruction. Furthermore, four periods （1770-1796, 1816-1836, 1884-1949, and 1973-1997） identified by the streamflow series had an obvious increasing trend. The increasing trend of streamflow since the 1970s was the biggest in the last 300 years and coincided with the recent warming-wetting trend in northwestern China. A significant correlation between streamflow and precipitation in the altay mountains indicated that the streamflow reconstruction contained not only local, but also broad-scale, hydro-climatic signals. The 24-year, 12-year, and 2.2-4.5-year cycles of the reconstruction revealed that the streamflow variability of the Haba River may be influenced by solar activity and

关键词： Larzx sibiffca Ledeb. Picea obovata Ledeb. streamflow reconstruction tree-ring width altay mountains

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Spatiotemporal changes of typical glaciers and their responses to climate change in Xinjiang,Northwest China

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Journal of Arid Land 2022年第5期14卷 502-520页

作者： HUANG Xiaoran BAO Anming GUO Hao MENG Fanhao ZHANG Pengfei ZHENG Guoxiong YU Tao QI Peng Vincent NZABARINDA DU Weibing State Key Laboratory of Desert and Oasis Ecology Xinjiang Institute of Ecology and GeographyChinese Academy of SciencesUrumqi 830011China University of Chinese Academy of Sciences Beijing 100049China Research Center for Ecology and Environment of Central Asia Chinese Academy of SciencesUrumqi 830011China China-Pakistan Joint Research Center on Earth Sciences Chinese Academy of Sciences and Higher Education CommissionIslamabad 45320Pakistan School of Geography and Tourism Qufu Normal UniversityRizhao 276800China College of Geographical Science Inner Mongolia Normal UniversityHohhot 010022China Xuchang University Xuchang 461000China Key Laboratory of Wetland Ecology and Environment Northeast Institute of Geography and AgroecologyChinese Academy of SciencesChangchun 130102China School of Surveying and Land Information Engineering Henan Polytechnic UniversityJiaozuo 454000China

Glaciers are highly sensitive to climate change and are undergoing significant changes in *** this study,we analyzed the spatiotemporal changes of typical glaciers and their responses to climate change in the period of 1990-2015 in 4 different mountainous sub-regions in Xinjiang Uygur Autonomous Region of Northwest China:the Bogda Peak and Karlik Mountain sub-regions in the Tianshan mountains;the Yinsugaiti Glacier sub-region in the Karakorum mountains;and the Youyi Peak sub-region in the altay *** standardized snow cover index(NDSI)and correlation analysis were used to reveal the glacier area changes in the 4 sub-regions from 1990 to *** areas in the Bogda Peak,Karlik Mountain,Yinsugaiti Glacier,and Youyi Peak sub-regions in the period of 1990-2015 decreased by 57.7,369.1,369.1,and 170.4 km^(2),*** of glacier area center of gravity showed that quadrant changes of glacier areas in the 4 sub-regions moved towards the *** area on the south aspect of the Karlik Mountain sub-region was larger than that on the north aspect,while glacier areas on the north aspect of the other 3 sub-regions were larger than those on the south *** precipitation in the Karlik Mountain sub-region inhibited the retreat of glaciers to a certain ***,glacier area changes in the Bogda Peak and Youyi Peak sub-regions were not sensitive to the increased *** a seasonal time scale,glacier area changes in the Bogda Peak,Karlik Mountain,Yinsugaiti Glacier,and Youyi Peak sub-regions were mainly caused by accumulated temperature in the wet season;on an annual time scale,the correlation coefficient between glacier area and annual average temperature was-0.72 and passed the significance test at P<0.05 level in the Karlik Mountain *** findings of this study can provide a scientific basis for water resources management in the arid and semi-arid regions of Northwest China in the context of global warmin

关键词： glacier area change normalized snow cover index(NDSI) climate change remote sensing altay mountains Tianshan mountains Karakorum mountains

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