基于TVDI的拉萨市干旱时空演变特征
Characteristics of Spatial and Temporal Evolution of Drought in Lhasa Based on TVDI
马铭鑫 1吴华 1尚梦 1李佳潼1
作者信息
- 1. 西藏大学工学院,拉萨 850000;高原地表环境遥感监测联合实验室,拉萨 850000
- 折叠
摘要
温度植被干旱指数(TVDI)作为一种进行植被覆盖区域表层土壤水分反演的方法,在干旱监测及研究干旱程度空间变化特征中发挥着重要作用.干旱是拉萨市最重要的自然灾害之一,采用温度植被干旱指数(TVDI)进行干旱监测,探究干旱情况,揭示干旱程度的空间变化特征.基于Landsat卫星数据构建拉萨市TVDI空间特征,计算温度植被干旱指数,结合年均降雨量数据,分析12个年份的干旱时空分布特征.结果表明,拉萨市干旱程度分布存在区域性特点,干旱程度较高的地区相对集中在拉萨市中部,整体干旱程度减少不明显,此结果可为干旱监测和干旱演变特征研究提供依据.
Abstract
As a method for retrieving surface soil moisture in vegetated areas,temperature vegetation Drought Index(TVDI)plays an important role in monitoring drought and studying the spatial variation characteristics of drought degree.Drought is one of the most important natural disasters in Lhasa.The study monitors the drought with TVDI,explores the drought situation,and reveals the spatial variation characteristics of drought degree.Then the study constructs the TVDI spatial characteristics of Lhasa based on Landsat satellite data,calculates the temperature vegetation drought index,and analyzes the spatial-temporal distribution characteristics of drought in 12 years combined with the average annual rainfall data.The results show that the distribution of drought degree in Lhasa has regional characteristics,and the areas with higher drought degree are relatively concentrated in the middle of Lhasa,and the overall drought degree is not significantly reduced.This result can provide reference for drought monitoring and characteristics of drought evolution.
关键词
TVDI/干旱/拉萨/时空演变Key words
TVDI/Drought/Lhasa/Spatial and temporal evolution引用本文复制引用
基金项目
西藏大学人才创新团队与实验室平台建设-高原地热新能源创新团队与实验室平台建设(2022ZDTD10)
中央支持地方部区合建/一流学科珠峰学科建设计划项目(藏财预指[2022]1号)
出版年
2024
NETL
NSTL
万方数据