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周卫永,许民,康世昌,韩海东,韩惠

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周卫永, 许民, 康世昌, 韩海东, 韩惠. 天山科其喀尔冰川表碛识别及其表面流速特征研究[J]. 开云体育苹果版学报 ( 信息科学版). doi: 10.13203/j.whugis20220656
引用本文: 周卫永, 许民, 康世昌, 韩海东, 韩惠. 天山科其喀尔冰川表碛识别及其表面流速特征研究[J]. 开云体育苹果版学报 ( 信息科学版).doi:10.13203/j.whugis20220656
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ZHOU Weiyong, XU Min, KANG Shichang, HAN Haidong, HAN Hui. Identification of Debris-covered Koxkar Glacier in Mt. Tianshan and Study on Its Velocity Characteristics[J]. Geomatics and Information Science of Wuhan University. doi: 10.13203/j.whugis20220656
Citation: ZHOU Weiyong, XU Min, KANG Shichang, HAN Haidong, HAN Hui. Identification of Debris-covered Koxkar Glacier in Mt. Tianshan and Study on Its Velocity Characteristics[J].Geomatics and Information Science of Wuhan University.doi:10.13203/j.whugis20220656
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天山科其喀尔冰川表碛识别及其表面流速特征研究

doi:10.13203/j.whugis20220656

  • 1 兰州交通大学 测绘与地理信息学院, 甘肃 兰州, 730070;

  • 2 中国科学院 西北生态环境资源研究院 冰冻圈科学国家重点实验室, 甘肃 兰州, 730070;

  • 3. 中国科学院大学, 北京, 100049;

  • 4 地理国情监测技术应用国家地方联合工程研究中心, 甘肃 兰州, 730070;

  • 5 甘肃省地理国情监测工程实验室, 甘肃 兰州, 730070

基金项目:

国家自然科学基金(41971094，41871055)；中科院青促会人才项目(2019414)。

详细信息
    作者简介:

    周卫永,硕士研究生,主要研究方向为雷达遥感应用和冰冻圈水文。dayzzwy@gmail.com

    通讯作者:许民,博士,副研究员,主要从事冰冻圈水文和水资源研究。xumin@lzb.ac.cn

Identification of Debris-covered Koxkar Glacier in Mt. Tianshan and Study on Its Velocity Characteristics

  • 1 Faculty of Geomatics, Lanzhou Jiaotong University, Lanzhou 730070, China;

  • 2 State Key Laboratory of Cryospheric Science, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730070, China;

  • 3 University of Chinese Academy of Sciences, Beijing 100049, China;

  • 4 Nation-Local Joint Engineering Research Center of Technologies and Applications for National Geographic State Monitoring, Lanzhou 730070, China;

  • 5 Gansu Provincial Engineering Laboratory for National Geographic State Monitoring, Lanzhou 730070, China

  • 摘要:表碛覆盖型冰川有其独特的物质平衡特征，冰川流速是评估物质平衡的重要指标。针对遥感方法难以区分冰川表碛和岩石的问题，利用结合纹理和地形因素的特征优选随机森林算法识别了天山科其喀尔冰川的表碛范围，比较于其他机器学习方法，识别精度能有显著提升。然后基于表碛识别结果和2017-2021年哨兵2号（Sentinel-2）影像数据，采用特征匹配及互相关计算（COSI-Corr）方法对表碛覆盖冰川流速进行了估算。表碛识别结果显示表碛覆盖面积约24.6 km 2，占整个科其喀尔冰川面积的31.7%。流速估算结果表明，科其喀尔冰川年均最大流速位于东支海拔4380 m左右位置，在2020年达到约145.9 m·a -1。随海拔降低，冰川末端流速递减至0~10 m·a -1。对研究区1989-2021年的流速变化进行长时序分析发现，冰川中上部流速随气候变暖而持续加快。在冰川下部海拔3090 m至3500 m的区间内，由于冰碛积累和冰舌的不断减薄，冰川表面流速持续降低，冰川物质平衡处在亏损状态。
    Abstract: Objectives:The spectral characteristics of supraglacial debris are extremely similar to those of rocks, which is difficult to retrieve by semi-automatic or automatic interpretation of remote sensing. Obtaining the extent of supraglacial debris and glacial surface flow velocity can help to understand the characteristics of glacier mass balance about debris-covered glaciers. Methods:The Random Forest method based on feature optimizatio is used to identify the supraglacial debris of the Koxkar Glacier. To increase the distinguishability between supraglacial debris and rocks, sentinel-2 images, remote sensing indexes, terrain features and texture features are also added for image classification. Glacial flow velocity is estimated using the Coregistration of Optical Sensed Images and Correlation (COSI-Corr) method, which is considered to be one of the most effective methods for small-scale and high-precision estimation of glacial flow velocity. Results:Compared with other machine learning classification methods, the Random Forest method based on feature optimization can effectively avoid the misclassification between supraglacial debris and rock. The result of identification shows that the area of debris is about 24.6 km 2, accounting for 31.7% of the total area of Koxkar Glacier. The results of glacial flow velocity show that the maximum average annual flow velocity occurs at about 4380 m above sea level in the eastern branch and can reach 145.9 m·a -1in 2020. The flow velocity reduces to 0~10 m·a -1with the decreasing elevation. The flow velocity during the ablation period is much higher than the annual mean velocity. The differences of velocity on the glacier tongue are induced by differences of altitude, ice lake outburst, collapse of Subglacial meltwater channeland and other factors. The changes of flow velocity in the study area from 1989 to 2021 shows that the flow velocity in the upper and middle part of the glacier continues to accelerate with the increase of surface temperature. In the range from 3090 m to 3500 m above sea level located in the lower part of the glacier, the flow velocity decreases continuously due to the accumulation of debris and the continuous thinning of glacier tongue. Conclusion:(1) Compared with other machine learning classification methods, the accuracy of the Random Forest method based on feature optimization has been significantly improved in identification of supraglacial debris. (2) In the past 30 years, the overall flow velocity of debris-covered Koxkar Glacier is slowly increasing with obviously spatio-temporal differences, and the glacier mass balance of the glacier below 3500 m above sea level is in a continuous deficit state.
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  • 收稿日期:2023-02-20
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doi:10.13203/j.whugis20220656
  • 1 兰州交通大学 测绘与地理信息学院, 甘肃 兰州, 730070;
  • 2 中国科学院 西北生态环境资源研究院 冰冻圈科学国家重点实验室, 甘肃 兰州, 730070;
  • 3. 中国科学院大学, 北京, 100049;
  • 4 地理国情监测技术应用国家地方联合工程研究中心, 甘肃 兰州, 730070;
  • 5 甘肃省地理国情监测工程实验室, 甘肃 兰州, 730070
    • 基金项目:

    国家自然科学基金(41971094，41871055)；中科院青促会人才项目(2019414)。

    作者简介:

    周卫永,硕士研究生,主要研究方向为雷达遥感应用和冰冻圈水文。dayzzwy@gmail.com

  • 收稿日期:2023-02-20
  • 网络出版日期:2023-03-31

摘要:表碛覆盖型冰川有其独特的物质平衡特征，冰川流速是评估物质平衡的重要指标。针对遥感方法难以区分冰川表碛和岩石的问题，利用结合纹理和地形因素的特征优选随机森林算法识别了天山科其喀尔冰川的表碛范围，比较于其他机器学习方法，识别精度能有显著提升。然后基于表碛识别结果和2017-2021年哨兵2号（Sentinel-2）影像数据，采用特征匹配及互相关计算（COSI-Corr）方法对表碛覆盖冰川流速进行了估算。表碛识别结果显示表碛覆盖面积约24.6 km2，占整个科其喀尔冰川面积的31.7%。流速估算结果表明，科其喀尔冰川年均最大流速位于东支海拔4380 m左右位置，在2020年达到约145.9 m·a-1。随海拔降低，冰川末端流速递减至0~10 m·a-1。对研究区1989-2021年的流速变化进行长时序分析发现，冰川中上部流速随气候变暖而持续加快。在冰川下部海拔3090 m至3500 m的区间内，由于冰碛积累和冰舌的不断减薄，冰川表面流速持续降低，冰川物质平衡处在亏损状态。

English Abstract

周卫永, 许民, 康世昌, 韩海东, 韩惠. 天山科其喀尔冰川表碛识别及其表面流速特征研究[J]. 开云体育苹果版学报 ( 信息科学版). doi: 10.13203/j.whugis20220656
引用本文: 周卫永, 许民, 康世昌, 韩海东, 韩惠. 天山科其喀尔冰川表碛识别及其表面流速特征研究[J]. 开云体育苹果版学报 ( 信息科学版).doi:10.13203/j.whugis20220656
shu
ZHOU Weiyong, XU Min, KANG Shichang, HAN Haidong, HAN Hui. Identification of Debris-covered Koxkar Glacier in Mt. Tianshan and Study on Its Velocity Characteristics[J]. Geomatics and Information Science of Wuhan University. doi: 10.13203/j.whugis20220656
Citation: ZHOU Weiyong, XU Min, KANG Shichang, HAN Haidong, HAN Hui. Identification of Debris-covered Koxkar Glacier in Mt. Tianshan and Study on Its Velocity Characteristics[J].Geomatics and Information Science of Wuhan University.doi:10.13203/j.whugis20220656
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