Impact of agricultural water management interventions on upstream-downstream trade-offs in the upper Cauvery catchment, southern India: a modelling study*
Impact of agricultural water management interventions on upstream-downstream trade-offs in the upper Cauvery catchment, southern India: a modelling study*
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农业用水管理干预措施对印度南部高韦里上游流域上下游权衡的影响：建模研究*
DOI：
10.1002/ird.2662
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发表时间：
2021
影响因子：
1.9
通讯作者：
Wable P
中科院分区：
文献类型：
--
作者：
Wable P
由于日益增长的用水需求，印度南部的考弗里盆地正在经历跨界问题。本研究分析了考弗里流域上游流域的水量平衡组成和农业用水管理(AWM)干预措施的影响。结果表明，研究流域年平均降雨量为1280 mm。其中，29%(370 mm)向下游流动，54%(700 mm)对蒸散(ET)有贡献，17%(215 mm)对地下水补给和地表储存有贡献。降雨量从700 到5400 mm不等，西高止山脉(山口)是淡水产生的主要来源。不同流域的蒸散量估计值在每年500~900 mm之间。在运河指挥区观察到，所有三个水库(Hemavathi、Harangi和KRS)的淡水分配有所增加，从1971-1980年的1.45亿立方米/年‾？增至2001年-2010年的3800百万立方米/年/年(Mcm/‾？)。旱涝灾害的干预措施收获了上Cauvery上游140-160Mcm(13-20 mm)的地表径流，并使流入Krishnaraja Sagar水库的流量减少了2-6%。研究结果对在流域尺度上设计和规划适当的水管理措施是有用的。
The Cauvery basin in southern India is experiencing transboundary issues due to increasing water demand. This study analysed water balance components and the impact of agricultural water management (AWM) interventions in the upper Cauvery catchment of the Cauvery basin. Results showed that the study catchment receives an average of 1280 mm of annual rainfall. Of this, 29% (370 mm) flows downstream, 54% (700 mm) contributes to evapotranspiration (ET) and 17% (215 mm) contributes to groundwater recharge and surface storage. Rainfall varies from 700 to 5400 mm and the Western Ghats (mountain pass) are the main source of freshwater generation. The estimated ET in different catchments ranged from 500 to 900 mm per annum. An increase in the allocation of fresh water supplied by all three reservoirs (Hemavathi, Harangi and KRS) was observed in the canal command areas, from 1450 million cubic metres (MCM) yr‾¹ in 1971–1980 to 3800 MCM yr‾¹ in 2001–2010. AWM interventions harvested 140–160 MCM (13–20 mm) of surface runoff upstream of the upper Cauvery and reduced inflow into the Krishnaraja Sagar reservoir by 2–6%. The study findings are useful for designing and planning suitable water management interventions at basin scale.