Extremely Shortage of Water in 1994 which enlarged the Area of Land Subsidence in the Nobi Plain

概要

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Extremely shortage of water in 1994 has enlarged the area of land subsidence in the Nobi Plain. The Nobi Plain is rich in groundwater as well as surface water from Kiso River, Nagara River and Ibi River. But in the summer of 1994, water supply was restricted in a long period and wide area due to the extremely shortage of water. So many enterprisers usually using surface water turned to use groundwater in this period. The change of observed groundwater level showed the fact. In this period, groundwater level was lowered rapidly, and drew down near and/or lower than the safety groundwater level which may induce land subsidence in the Nobi Plain. This safety groundwater level was estimated by one of authors on an earlier occasion. Although the groundwater level was recovered by increased precipitation in September, land subsidence was not recovered.<BR>In this report, the reason of enlargement of the area of land subsidence in the Nobi Plain in the period of 1994 water shortage was studied by using observed data of groundwater level, groundwater withdrawal and ground contraction. An idea of groundwater management of the Nobi Plain in the case of future water shortage is presented.
Japanese Association of Groundwater Hydrologyの論文