从宋代丰利渠古引水位探讨泾河水量变化趋势

根据宋代丰利渠引泾自流灌溉引水位，经实地考察测算，结合当代水资料分析，估算出宋代泾河入冬１０，１１月平均流量和年平均流量均为３２０ｍ＾３／ｓ左右，而２０年代有水记载以来则分别减少到６２ｍ＾３／ｓ和６３．６ｍ＾３／ｓ，揭示出泾河水量随着历史发展有显衰减趋势。形成这种情况的大背景是“中国中纬度地带气候暖干化”。

Approaching Variation Trend of Runoff Volume of the Jing River from Palaeo-Dinversion Level Of Fengli in Song Dynasty

According to the diversion level of irrigation.by goavity of Fengli canal in song Dynasty and on-the -spot invedigntion and Calculation and through the analysis of the present time hydrological daal, it is estimated that the average discharge of October and November arid the mean annual discharge of the Jing River in song Dynasty is about 320 m3/s, but, according to hydrological record that it has been reduced to 62 m3/s and 63. 6m3/s respeptively since 1920s. It shows that the runoff of the Jing River is a remarkable tendency towards reduction along with the development of history. The background of forming such situation is warm and dry climate of middle latitude Zone in china.