PG Department of Geography, Raja N. L. Khan Women's College (Autonomous), Gope Palace, Midnapore, West Bengal, 721102, India.
Department of Earth Sciences, Indian Institute of Engineering Science and Technology, Shibpur, West Bengal, India.
Environ Sci Pollut Res Int. 2021 May;28(20):25514-25528. doi: 10.1007/s11356-021-12461-4. Epub 2021 Jan 18.
The sudden lockdown recovers the health of the total environment particularly air and water while the country's economic growth and socio-cultural tempo of people have been completely hampered due to the COVID-19 pandemic. Most of the industries within the catchment area of river Damodar have been closed; as a result, significant changes have been reflected throughout the stretch of river Damodar. The main objective of the study is to analyze the impact of lockdown on the water quality of river Damodar. A total of 55 samples was collected from eleven different confluence sites of nallas with the main river channel during and pre-lockdown period. The relevant methods like WQI, TSI, Pearson's correlation coefficient, and "t" test have been applied to evaluate the physical, chemical, and biological status of river water. The result of "t" test indicated that there are significant differences (α = 0.05) of each parameter between pre and during lockdown. Water quality index (WQI) is used for analysis of drinking water quality suitability followed by BIS. The values of WQI showed "very poor" (S1, S2, S3, S6, S7, and S11) to "unfit for drinking" (S4, S5, S8, S9, and S10) of river water during pre-monsoon season. The nutrient enrichment status of the river was analyzed by Trophic State Index (TSI) method and it shows the "High" eutrophic condition with a heavy concentration of algal blooms in almost an entire stretch. During lockdown, nutrient supplies like TN and TP have been reduced and is designated as "Low" (S1, S2) to "Moderate" (S3 to S11) eutrophic condition of middle stretch of Damodar. This research output of river Damodar will definitely assist to policy makers for sustainable environmental management despite the dilemma between development and conservation.
由于 COVID-19 大流行，该国的经济增长和社会文化节奏已完全受到阻碍，而突然的封锁却恢复了整个环境的健康，尤其是空气和水。达莫达尔河集水区内的大多数工业都已关闭；因此，达莫达尔河的整个流域都发生了重大变化。本研究的主要目的是分析封锁对达莫达尔河水质的影响。在封锁期间和封锁前，从 11 个不同的 nallas 与主要河道的汇合点共采集了 55 个样本。应用相关方法，如水质指数（WQI）、总悬浮物指数（TSI）、皮尔逊相关系数和“t”检验，评估河水的物理、化学和生物状况。“t”检验结果表明，各参数在封锁前后均有显著差异（α=0.05）。水质指数（WQI）用于分析饮用水质量适宜性，其次是 BIS。WQI 值显示，在旱季前，河水的水质为“非常差”（S1、S2、S3、S6、S7 和 S11）至“不适宜饮用”（S4、S5、S8、S9 和 S10）。采用营养状态指数（TSI）法分析了河流的富营养化状况，结果表明，在几乎整个流域，藻类大量繁殖，河流处于“高”富营养化状态。在封锁期间，TN 和 TP 等营养物质的供应减少，中流域的达莫达尔河被指定为“低”（S1、S2）到“中”（S3 到 S11）富营养化状态。尽管发展与保护之间存在两难困境，但这项对达莫达尔河的研究成果必将有助于决策者进行可持续的环境管理。
