The water budget of the Mahadayi river and its implications for the inter-state dispute

IF 1.3 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY
K Anilkumar, D Shankar, K Suprit
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Abstract

We assess the water budget of the Mahadayi river, an inter-state basin on India’s west coast with a long-running dispute. We seek to answer the following question: What is the discharge at any given location along the Mahadayi river or its tributaries on any given day? After presenting the dispute and the decisions of the tribunal, we describe the modelling framework, which is able to simulate the high rainfall gradients in the neighbourhood of the ridge associated with the Sahyadris, the high discharge during the summer monsoon, the much weaker discharge following the monsoon, and the high abstraction during monsoon onset. The model is not designed to simulate the negligible dry-season discharge. The simulation yields the daily time series of discharge at any location along the Mahadayi or its tributaries. For the Kalasa nala, there is a significant impact of the permitted diversion in the northern part of the Mhadei Wildlife Sanctuary, but the impact on the Mahadayi discharge or the Mandovi estuary is less than the natural variability. The Bhandura diversion has a minor impact on the discharge at the Goa–Karnataka border. Based on the simulated water budget, we suggest possible solutions to resolve the dispute.

Abstract Image

马哈达伊河的水量预算及其对国家间争端的影响
我们评估了马哈达伊河的水量预算,这是印度西海岸的一个邦际流域,长期以来一直存在争端。我们试图回答以下问题:马哈达伊河或其支流沿岸任何地点在任何一天的排水量是多少?在介绍了争端和仲裁庭的裁决之后,我们介绍了建模框架,该框架能够模拟与萨哈德里斯山脉相关的山脊附近的高降雨梯度、夏季季风期间的高排水量、季风过后弱得多的排水量以及季风来临时的高取水量。该模型无法模拟可忽略不计的旱季排水量。模拟可得出马哈达伊河或其支流沿岸任何地点的日排泄量时间序列。就 Kalasa nala 而言,马代野生动物保护区北部允许的分流会产生重大影响,但对马哈达伊河或曼多维河口排水量的影响小于自然变化。班杜拉引水对果阿-卡纳塔克邦边界的排水量影响较小。根据模拟的水量预算,我们提出了解决争端的可行方案。
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来源期刊
Journal of Earth System Science
Journal of Earth System Science Earth and Planetary Sciences-General Earth and Planetary Sciences
CiteScore
3.20
自引率
5.30%
发文量
226
期刊介绍: The Journal of Earth System Science, an International Journal, was earlier a part of the Proceedings of the Indian Academy of Sciences – Section A begun in 1934, and later split in 1978 into theme journals. This journal was published as Proceedings – Earth and Planetary Sciences since 1978, and in 2005 was renamed ‘Journal of Earth System Science’. The journal is highly inter-disciplinary and publishes scholarly research – new data, ideas, and conceptual advances – in Earth System Science. The focus is on the evolution of the Earth as a system: manuscripts describing changes of anthropogenic origin in a limited region are not considered unless they go beyond describing the changes to include an analysis of earth-system processes. The journal''s scope includes the solid earth (geosphere), the atmosphere, the hydrosphere (including cryosphere), and the biosphere; it also addresses related aspects of planetary and space sciences. Contributions pertaining to the Indian sub- continent and the surrounding Indian-Ocean region are particularly welcome. Given that a large number of manuscripts report either observations or model results for a limited domain, manuscripts intended for publication in JESS are expected to fulfill at least one of the following three criteria. The data should be of relevance and should be of statistically significant size and from a region from where such data are sparse. If the data are from a well-sampled region, the data size should be considerable and advance our knowledge of the region. A model study is carried out to explain observations reported either in the same manuscript or in the literature. The analysis, whether of data or with models, is novel and the inferences advance the current knowledge.
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