Assessing water footprints and virtual water flows in Gomti river basin of India

被引:15
|
作者
Mali, Santosh S. [1 ]
Singh, D. K. [2 ]
Sarangi, A. [2 ]
Parihar, S. S. [2 ]
机构
[1] ICAR Res Complex Eastern Reg, Res Ctr, Ranchi 834010, Bihar, India
[2] Indian Agr Res Inst, Water Technol Ctr, New Delhi 110012, India
来源
CURRENT SCIENCE | 2018年 / 115卷 / 04期
关键词
Economic water productivity; river basin; virtual water flow; water footprint; NITROGEN;
D O I
10.18520/cs/v115/i4/721-728
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
This article analyses the blue, green and grey water footprints and virtual water flows within the Gomti river basin (GRB) in India. Assessments were made at spatial resolution of agricultural production units (APUs). An APU is a homogeneous spatial unit delineated on the basis of soil type, agro-ecological region and district boundaries. Water footprints of crop production and consumption were compared to arrive at virtual water balance within the GRB. Results show that water footprint of GRB was 12,773 million m 3 year Crop production was the largest water consumer accounting for 95.5% of water footprint within the basin. The higher proportion of blue water footprint (47.3%) indicates the dependence of GRB on irrigated agriculture. Contribution of rainfed agriculture to total water footprint was about 11.2%. Considerable portion of blue water is used in the production of low value water-intensive crops. The GRB was assessed as a net virtual water importer, indicating its dependence on the water resources of other river basins; it imports 2945 million m 3 virtual water annually. This scenario can be changed if the area allocated to different water-intensive crops is optimized and limited to the extent that meets the consumption needs within the basin, leading to reduction in production surplus of these crops.
引用
收藏
页码:721 / 728
页数:8
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