近世・近代における富山藩領の土地利用と治水に関する研究

摘要

本研究では、まず富山町の水害の自然要因として、市街地に接する神通川だけではなく、藩領外の常願寺川にも注目した。急流で侵食力が強い同川は、分派する鼬川を介して扇状地の農村と扇端の富山町を潤しつつ、脅かしてもきた。特に、幕末の飛越地震以降は、源流に膨大な崩壊土砂を蓄える危険な河川と化す。%This study is to analyze the history of Toyama town, which had been struggled with repeating damages of floods since it was founded, focusing on its geography, land-use and river management. The resulted findings are as follows. 1) The Joganji-River as well as the Jintsu-River flooded the town. 2) Three major measures taken by the rulers to develop their territory made damages more serious. That is, harnessing the Jintsu-River as a castle moat, expanding the town into the bottomlands along the two rivers and making irrigation systems from the Joganji-River, which also could draw the flood water to the town.