1967–2014年科西河流域面积≥0.05 km2冰湖轮廓数据集

A dataset of outlines of glacial lakes with an area of no less than 0.05 km2 in the Koshi River basin from 1967 to 2014

科西河流域发育有众多的冰川和冰湖,冰川覆盖率达9.78%,冰湖数量221个,冰湖分布及变化不仅是预测该区域冰湖溃决洪水灾害的基础数据,而且可以在一定程度上反映高山寒区气候及冰川水资源的变化。本数据集应用1960s–2010s多源遥感影像数据(Corona、Landsat MSS/TM/ETM+/OLI)及地形图进行目视解译获得了科西河流域1960s、1970s、1980s、1990s、2000s和2010s的6期冰湖数据,解译精度控制在一个像元以内。研究区空间范围为26.86°–29.14°N,85.39°–88.95°E,覆盖印德拉瓦迪、孙科西、绒辖曲、利库科拉、牛奶河、阿润和塔木尔等子流域。本数据集包括科西河流域内面积≥0.05 km2的冰湖,数据集时序较长且包含冰湖类型及其他几何属性信息,可作为科西河流域冰湖时空变化、冰湖水量变化评估的基础数据,也可作为喜马拉雅山地区冰湖溃决危险性评估、水资源变化、气候变化及冰湖与冰川间变化响应关系等研究的重要依据。

There are numerous glaciers and glacial lakes in the Koshi River basin.The coverage rate of glaciers reaches 9.78%and the number of glacial lakes is 221.The distribution and change of glacial lakes in this region are the most important factors for predicting the disaster of glacial lake outburst floods(GLOFs),and can also reflect the changes of climate and glacial water resources in alpine frigid areas to a certain extent.The dataset includes the vectorized outlines of glacial lakes with an area of no less than 0.05 km2 during six periods in the Koshi River basin,that is,1960s,1970s,1980s,1990s,2000s and 2010s,which were acquired by using multisource remote sensing image(Corona,Landsat MSS/TM/ETM+/OLI)and topographic maps to conduct a visual interpretation.We controlled the accuracy of interpretation within one pixel.Lying between 26.86°–29.14°N and 85.39°–88.95°E,the study area is composed of several sub-basins including Indrawati,Sun Koshi,Tama Koshi,Likhu,Dudh Koshi,Arun and Tamor.The dataset has a long time series,type and geometric properties of glacial lakes,which can be used as the basic data for assessing the temporal-spatial changes of glacial lakes and the changes in water volume of glacial lakes in the Koshi River basin.In addition,it can also be used as an important basis for the risk assessment of GLOFs,the changes of water resources,climate change and the relationship between glacial lakes and glaciers in this region.