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Water indicators based on SPOT 6 satellite images in irrigated area at the Paracatu River Basin, Brazil

机译:基于SPOT 6卫星图像的水指标,位于巴西帕拉卡图河流域的灌溉区

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The Paracatu River is the largest affluent of the Sao Francisco River, Brazil. The main water use in the Paracatu river basin is irrigation, which occupies an area of 37,150 ha. The objective in this study was to obtain water indicators at irrigated areas using the SAFER (Simple Algorithm For Evapotranspiration Retrieving) and the Penman-Monteith models with images of SPOT 6 satellite (without the thermal band). The parameters obtained are evapotranspiration (ET), albedo (a), biomass (BIO), surface temperature (Tsup) and water productivity (PA) in irrigated areas of Paracatu River Basin. We used 2 satellite images by the sensor SPOT6 (by Astrium Company) with a spatial resolution of 6 m (August 8, 2014 and August 23, 2015) and data from meteorological stations. In irrigated areas, the NDVI reached values higher than 0.76, due the response of vegetation to irrigation. The daily average albedo was 0.18 ± 0.01 and 0.02 ± 0.17 respectively. In the analysis of the surface temperature (Tsup), it can be observed that in the image of 2015, mean values higher than those observed in the image of 2014 (303.03 ± 1.97 K and 299.34 ± 3.47 K, respectively). In 2015, due to increased atmospheric evaporative demand, ET reached values higher than those seen in the scene in 2014. The average daily evapotranspiration rate in Paracatu for 2014 scene was of 0.81±1.49 mm, with a maximum value of 8.96 mm at the irrigated areas. In image of 2015 the average evapotranspiration (ET) values was 1.87±1.27 mm. The results obtained in this study may assist in the monitoring of irrigated agriculture to face a trend of scarcity of water resources and of increasing conflicts over water use as occurs in the Paracatu River Basin.
机译:帕拉卡图河是巴西圣弗朗西斯科河最大的河流。帕拉卡图河流域的主要用水是灌溉,占地37,150公顷。这项研究的目的是使用SAFER(用于蒸发蒸腾的简单算法)和带有SPOT 6卫星图像(无热带)的Penman-Monteith模型获得灌溉区域的水指标。获得的参数是帕拉卡图河流域灌溉区的蒸散量(ET),反照率(a),生物量(BIO),地表温度(Tsup)和水生产率(PA)。我们使用了传感器SPOT6(由Astrium公司制造)的2幅卫星图像,其空间分辨率为6 m(2014年8月8日和2015年8月23日),以及来自气象站的数据。在灌溉地区,由于植被对灌溉的响应,NDVI值高于0.76。每日平均反照率分别为0.18±0.01和0.02±0.17。在分析表面温度(Tsup)时,可以观察到2015年图像中的平均值高于2014年图像中的平均值(分别为303.03±1.97 K和299.34±3.47 K)。 2015年,由于大气蒸发需求增加,ET达到的值高于2014年现场。2014年Paracatu的日平均蒸散量为0.81±1.49 mm,灌溉水的最大值为8.96 mm地区。在2015年的图像中,平均蒸散量(ET)值为1.87±1.27 mm。这项研究获得的结果可能有助于对灌溉农业进行监测,以应对水资源短缺的趋势,以及在帕拉卡图河流域发生的用水冲突日益加剧的趋势。

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