基于Landsat8 TVDI的河套灌区旱情分析——以临河区为例

DROUGHT ANALYSIS OF HETAO IRRIGATION DISTRICT BASED ON LANDSAT 8 TVDI——TAKING LINHE DISTRICT AS AN EXAMPLE

关键词:  Landsat8 TVDI 河套灌区 旱情分析 参数反演

Key words:  Landsat8  TVDI  Hetao irrigation area  drought analysis  parameter inversion

摘要:

［目的］河套灌区是我国北方重要粮、油生产基地，该区域地处我国干旱区，及时有效地监测评价该地区的旱情状况，对农业有十分重要的意义。通过遥感手段监测河套灌区旱情状况，将研究区分为无旱、轻旱和干旱3个旱情等级，并对统计结果进行评价，以期为当地农业生产提供参考。［方法］选取2016年7月1日的两景Landsat8 遥感影像数据，针对遥感参数进行计算反演，对归一化植被指数(NDVI)、地表温度（LST）和温度植被干旱指数（Temperature Vegetation Dryness Index，TVDI）等遥感参数分级统计，评价临河区旱情。［结果］3个旱情等级中，无旱的面积为466.38 km2，占临河区面积的20.02%；轻旱的面积为1 176.50 km2，占临河区面积的50.49%；干旱的面积为687.12 km2，占临河区面积的29.49%。临河区东北地区旱情面积比重较大；西南地区靠近黄河及人工渠旱情面积较小或者无旱情发生。［结论］该方法适合农业旱情的快速监测评价，能较好地反映区域旱情空间分布，监测结果具有一定的实用价值。

Abstract:

Hetao region is an important production base of grain and oil in north China, which located in the arid area of China. To timely and effectively monitor and evaluation the drought situation in the region has great significance in the agricultural development. This paper evaluated the drought status in the Hetao irrigation area using remote sensing method, and further divided this area into 3 types, i.e., non-drought, light drought and drought. Two scenes Landsat 8 remote sensing data in July 1 2016 were used to estimate NDVI, LST and TVIDI for the drought evaluation in Linhe. The results indicated that the non-drought area covered 466.38 km2, accounting for 20.02% of the study area; light drought area was 1176.50 km2, accounting for 50.49%, and drought area covered 687.12 km2, accounting for 29.49% of the total area. The drought area, the light drought, and non-drought area distributed in the northeast of Linhe, southwestern near the Yellow River, respectively. It concluded that the method was reasonable for agricultural drought evaluation and reflecting the distribution of the drought. The study result will provide a reference for the local agricultural management.