Combined signatures of atmospheric drivers, soil moisture, and moisture source on floods in Narmada River basin, India
Combined signatures of atmospheric drivers, soil moisture, and moisture source on floods in Narmada River basin, India
复制标题
印度讷尔默达河流域洪水的大气驱动因素、土壤湿度和水分源的综合特征
作者：
J. S. Nanditha;B. Rajagopalan;V. Mishra
每年夏季季风（6月至9月）期间，印度的洪水都会影响数百万人。大气因素、陆地表面条件、水分来源和途径在雨养河流流域产生洪水的过程中发挥着综合作用。然而，对印度河流流域洪水的研究多考虑极端降水的作用，往往忽略了陆地和大气等因素的关键贡献。以印度中部纳尔马达河流域为试验平台，研究了1951-2018年期间该流域极端降水、土壤湿度和水分来源对洪水的联合特征。研究发现，流域高流量事件主要发生在8月和9月，其中80%左右的高流量事件是由极端降水和较高的前缘土壤湿度共同引起的。纳尔马达盆地的主要致洪风暴与高垂直整合水汽通量、低平均海平面气压和强风有关。阿拉伯海是产生洪水的风暴的主要湿气来源。然而，以前未被认识到的北印度平原也是季风中后期盆地洪水产生风暴的主要来源。在上游子盆地，来自陆地表面的水汽循环在风暴事件的水汽来源中占主导地位，而来自阿拉伯海的水汽在下游子盆地的贡献更高。这些陆地、海洋和大气的综合联系可以帮助为印度河流流域开发熟练的早期洪水预警系统。
Floods in India affect millions of people during the summer monsoon (June–September) every year. Atmospheric factors, land surface conditions, and moisture source and pathways ride a combined signature in producing floods in rain-fed river basins. However, floods in Indian river basins are mostly studied considering the role of extreme precipitation, and critical contribution of factors related to land and atmosphere is often neglected. Using the Narmada River basin in central India as a testbed, we investigated the combined signature of extreme precipitation, soil moisture, and moisture sources on floods in the basin during 1951–2018 period. We find that most of the high-flow events in the basin occur during August and September and, about 80% of them are caused by extreme precipitation combined with higher antecedent soil moisture. The major flood producing storms in the Narmada basin are linked with high amount of vertically integrated water vapor flux, low mean sea level pressure, and strong winds. The Arabian Sea is the primary moisture source for the flood producing storms. However, previously unrecognized north Indian plain is also a dominant source of flood producing storms in the basin during the mid and late monsoon season. The moisture recycled from land-surface predominates the moisture sources of storm events in the upstream sub-basins while the contribution of moisture from the Arabian Sea is higher in the downstream sub-basins. These combined linkages of land, ocean and atmosphere, can assist in developing skillful early flood warning system for the Indian river basins.
影响因子：
4.6
作者：
Hunt K
通讯作者：
Hunt K
美国干旱/半干旱西南部极端降雨对大气湿度的敏感性：对可能最大降水量估计的影响
DOI：
10.1002/2017jd027850
发表时间：
2018
期刊：
Journal of Geophysical Research: Atmospheres
影响因子：
--
作者：
Yang, Long;Smith, James
通讯作者：
Smith, James