PDF(Pubmed)
Abstract：
The COVID-19 pandemic significantly destructs the rhythm of global modern human civilization but worldwide lockdown radically recovers the health of the total environment. The Himalayan trans-boundary rivers provide huge provisional, regulatory and cultural ecosystem services to millions of people throughout the year but in the recent years the water quality is being deteriorated due to multiple reasons. In the last decade, India-Bangladesh political relationship has been slightly broken down due to water sharing and environmental flow of rivers.The COVID-19 lockdown offered a great scope to execute the comparative study among pre, lockdown and unlock phase. The research attempts to investigate the spatiotemporal water quality of trans-boundary rivers through WAWQI and irrigation water quality indices such as Sodium absorption ratio, Soluble sodium percentage, Potential salinity, Magnesium hazard and Kelly\'s index considering eighteen water quality parameters (pH, EC, TDS, TSS, Ca²⁺, Mg²⁺, Na²⁺, K⁺, F-, Cl-, NO3-, SO₄²-, PO43-, DO, T, TUR, COD and BOD). The result shows the strong positive correlation between EC and TDS during three phases. Significant reduction of BOD, COD and TUR has been noticed almost 70% stations during lockdown compared with prelockdown while augmentation of DO has been recorded around 40% stations. WQI of most of the stations shows around 80% improvement of water quality during lockdown period. Moreover, worst kind of WQI was found in the Mathabhanga-Churni river followed by Mahananda. During lockdown, the striking results show that SAR and MH were significantly amplified in most of the stations due to agricultural run-off.
摘要：
COVID-19大流行极大地破坏了全球现代人类文明的节奏，但全球范围的封锁从根本上恢复了整个环境的健康。喜马拉雅跨界河流提供了巨大的临时，全年为数百万人提供监管和文化生态系统服务，但近年来，由于多种原因，水质正在恶化。在过去的十年里，由于水的共享和河流的环境流动，印度与孟加拉国的政治关系略有破裂。COVID-19的封锁为执行对比研究提供了很大的空间，锁定和解锁阶段。本研究试图通过WAWQI和钠吸收比等灌溉水质指标调查跨界河流的时空水质，可溶性钠百分比，潜在盐度,考虑18个水质参数(pH，EC,TDS,TSS,Ca²,Mg²,Na²,K,F-,Cl-,NO3-,SO²-,PO43-,DO,T,TUR,COD和BOD)。结果表明，在三个阶段，EC和TDS之间存在强正相关。BOD大幅减少，与预封锁相比，在封锁期间发现了近70％的COD和TUR站，而在40％的站中记录了DO的增加。大多数站点的WQI显示，在封锁期间，水质改善了约80％。此外，在Mathabhanga-Churni河中发现了最糟糕的WQI，其次是Mahananda。在封锁期间,惊人的结果表明，由于农业径流，大多数站点的SAR和MH显着放大。
