徳島県那賀川河口域における地下水の観測と塩水侵入の解析

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  • Groundwater observation and analysis of saltwater intrusion in Naka River estuary, Tokushima Prefecture
  • トクシマケン ナカガワ カコウイキ ニ オケル チカスイ ノ カンソク ト エンスイ シンニュウ ノ カイセキ

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<p>Field observation of water quality and investigation of the amount of groundwater use were carried out in the estuary of Naka River, Tokushima Prefecture, Japan. This region has an ongoing salinity problem of the confined groundwater. By using numerical analysis, the reproduction of the present state and prediction of future salinity were made. Though in this region the groundwater is utilized as drinking water, industrial water, fishery product water and agricultural water, the greater part is utilized as industrial water and fishery product water. The amount used for drinking water is 10-20%, and very little is used for agriculture. Most industrial water originates in river-bed water. In the past, the main factor in the salinity of the confined groundwater in this region was superfluous pumping for fishery product water. As the number of culture farms has decreased recently, if the current amount of pumping is maintained, the intrusion of salt water further inland is not expected to occur. However, presently there is a condition in which salt water has intruded about 6 km inland from the coast into a confined aquifer on the right bank of the Naka River. Moreover, in the analysis on the assumption of sea level rise with climatic change as a future prediction, salt water will intrude further inland than in the present state.</p>

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