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7.0级地震对九寨沟核心景观和水化学影响
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引用本文:党 政,任锦海,安 超,代群威,董发勤,邓远明,杨青霞,卓曼他.7.0级地震对九寨沟核心景观和水化学影响[J].中国岩溶,2019,(2):186-192. DANG Zheng,REN Jinhai,AN Chao,DAI Qunwei,DONG Faqin,DENG Yuanming,YANG Qingxia,ZHUO Manta.Effect of Ms 7.0 earthquake on travertine landscapes and hydrochmistry of Jiuzhaigou core scenic spots[J].Carsologica Sinica,2019,(2):186-192.
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党 政 西南科技大学环境与资源学院四川 绵阳 621010 
任锦海 九寨沟国家级自然保护区管理局四川 阿坝 624000 
安 超 住房和城乡建设部城乡规划管理中心北京 100835 
代群威 西南科技大学环境与资源学院四川 绵阳 621010 
董发勤 西南科技大学环境与资源学院四川 绵阳 621010 
邓远明 西南科技大学环境与资源学院四川 绵阳 621010 
杨青霞 九寨沟国家级自然保护区管理局四川 阿坝 624000 
卓曼他 九寨沟国家级自然保护区管理局四川 阿坝 624000 
基金项目:国家自然科学基金面上项目(41877288, 41572035, 41472309);国家自然科学基金应急项目(41741026)
中文摘要:2017年发生里氏7.0级地震,九寨沟景区位于此次地震的核心区域,受损严重。对景区现场踏勘和珍珠滩、镜海、诺日朗和火花海4处地表水主要离子的取样分析,初步得出景观受损情况及水化学变化:地震对部分景观造成破坏,钙华坝体开裂及崩塌,火花海最为严重;震后地表水水化学主要受Ca2+和HCO3-的影响,地震和降雨加速了矿物溶解,导致Ca2+和HCO3-浓度高于往年;受钙华沉积的影响,Ca2+和HCO3-浓度随海拔降低而降低,受降水量减少的影响,Ca2+和HCO3-浓度随时间下降,2018年3月份HCO3-浓度上升,与光合作用、CO2溶解量及水温等因素相关;震后4处景观地表水SIC值>0,利于钙华沉积。水化学结果说明此次地震增加了水体Ca2+和HCO3-浓度,如及时实施人工干预,受损景观可以实现恢复。
中文关键词:九寨沟  钙华  景观演化  地震  水化学
 
Effect of Ms 7.0 earthquake on travertine landscapes and hydrochmistry of Jiuzhaigou core scenic spots
Abstract:There was an earthquake with magnitude of 7.0 occurred in 8th August, 2017. The Jiuzhaigou scenic spot is located in the vicinity of epicenter area which was seriously damaged. After the earthquake, the research group carried out surveys of the scenic spot and collected samples in the surface water of Pearl Shoal, Mirror Lake, Nuorilang Waterfull and Sparking Lake. Through the analysis of the spatial-temporal distribution characteristics and correlation of main ions in the surface water, the damage of the scenic spot landscape and the change of hydrochemical characteristics were preliminarily assessed. Results demonstrated that this earthquake caused the damage including cracking and collapse to some core landscapes in Jiuzhaigou valley, among which the Sparking Lake was the worst damaged. Hydrochemistry of surface water after earthquakes was related to the change of Ca2+ and HCO3- concentrations, both ions were higher than historical data with increasing mineral dissolution caused by earthquake and precipitation. The concentration of Ca2+ and HCO3- decreased with decreasing altitude due to the influence of travertine depositions.The concentration of Ca2+ decreased with time which were related to the precipitation decreases, and the concentration of HCO3- decreased first and then increased with time, it was deduced that CO2 dissolution in water has rose. After the earthquake,the SIc value in surface runoff of 4 landscapes was more than 0,which was easy to travertine deposition. The hydrochemical results show that the earthquake increased the concentration of Ca2+ and HCO3- in the water , if the artificial intervention is implemented in time, the damaged landscape could be restored.
keywords:Jiuzhaigou valley,travertine,landscape evolution,earthquake,hydrochemistry
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