Abstract

Agricultural water demand (AWD) and irrigation water demand (IWD) were assessed (2009–2018) over India using geostationary and polar orbiting satellites. A novel concept of satellite based composite crop-coefficient was introduced to address bulk AWD from mixed agricultural landscape. Significant spatio-temporal variation of AWD was observed over India. The decadal mean of annual AWD was found to be 1521 km³ contributing around 52% (789 km³) and 48% (732 km³) in kharif and rabi seasons, respectively. The decadal average IWD over India was found to be 360 km³. At annual scale, around 75% of AWD was found fulfilled by effective rainfall and the rest 25% is the IWD. The decadal trend of AWD and IWD showed significant increasing trend over Indian region. The study provides a baseline reference for regional agricultural water management policy over diverse agro-climatic regions of India with an opportunity to optimize AWD and IWD at different locations.

摘要

使用地球静止和极地轨道卫星评估（2009-2018 年）印度的农业用水需求（AWD）和灌溉用水需求（IWD）。引入了一种基于卫星的复合作物系数的新概念，以解决混合农业景观中的批量 AWD。在印度观察到 AWD 的显着时空变化。发现年 AWD 的十年平均值为 1521 km ³，分别在 kharif 和 rabi 季节贡献了约 52%（789 km ³）和 48%（732 km ^{3 ）。}印度的十年平均 IWD 为 360 km ³. 在年尺度上，大约 75% 的 AWD 是由有效降雨实现的，其余 25% 是 IWD。AWD和IWD的十年趋势在印度地区呈显着增加趋势。该研究为印度不同农业气候地区的区域农业水资源管理政策提供了基准参考，并有机会在不同地点优化 AWD 和 IWD。