探索土地利用、土地利用的变化对维达瓦蒂盆地水文气象变化的影响

Krishna Kumar S. , S.A. Ahmed , Sanjay Kumar , Jyothika Karkala
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摘要

维达瓦蒂河流域的研究确定了不断变化的土地利用、土地覆盖(LULC)模式对植被、水和温度参数的影响。研究使用了 2005 年、2010 年、2015 年和 2022 年大地遥感卫星和 MODIS 卫星产品(MOD11C3、MOD13Q1)以及 IMD 测量的地面降雨量,采用归一化差异植被指数(NDVI)、归一化差异水指数(NDWI)、地表温度(LST)和标准化降水指数(SPI)等指数方法,对流域情况进行了分析。自 2005 年以来,已有 2000 多平方公里的休耕地转变为耕地。二十年间,22.35% 的草地变成了种植园,13% 的灌丛森林变成了荒地。耕地面积的增加和森林面积的变化带来了 NDVI 平均值的增加,同时也带来了温度值的增加。2003 年和 2004 年,大部分站点都出现了极端干旱的情况,而 2010 年和 2020 年则出现了类似洪水的情况。总体而言,大部分干旱状况出现在 20 世纪 90 年代和 21 世纪初,而洪水状况则在研究后期较为突出。本研究旨在了解所有这些因素之间的关系以及相互影响的强度。
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Exploring the influence of LULC change on hydro-meteorological shifts in the Vedavathi basin

The influence of the changing land use land cover (LULC) pattern on the vegetation, water, and temperature parameters is ascertained in the study of the Vedavathi River basin. For the years 2005, 2010, 2015, and 2022 Landsat and MODIS satellite products (MOD11C3, MOD13Q1) along with the ground-based rainfall from IMD measurement were used to implement the methods of indices such as normalized difference vegetation index (NDVI), normalized difference water index (NDWI) along with the land surface temperature (LST), and standardized precipitation index (SPI) and analyze the situation in the basin. Since 2005 more than 2000 km2 of fallow land has been transformed into cropland. 22.35% of grassland was converted to plantation in two decades while 13% of scrub forest has been reduced to wasteland. The increase in the cropland and the changing forest area has brought an increase in the mean NDVI value while at the same time an increase in the temperature value. The years 2003 and 2004 witnessed an extreme dry conditions in most of the stations while 2010 and 2020 experienced flood-like conditions. Overall majority of the drought conditions were witnessed in the 1990s and 2000s while flood conditions were prominent in the later part of the study. The study aims to provide an understanding between all these factors and what is the intensity of influence on each other.

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