CASE STUDY OF COMPREHENSIVE MANAGEMENT OF WATERRESOURCES IN DROUGHT PERIODS IN TONE. YODO & YAHAGI RIVER BASINS

本研究揭示了大流域缺水的事实和逻辑：(1)台风季节过后的初秋，在正常年份预计未来径流的基础上，过于乐观地进行水资源管理，导致水库结转蓄水缺水。在Yodo流域，这种短缺通常发生在一些干旱年份。(2)在流量基础上，对流域融雪造成的径流过于乐观，导致所有流域的水库因水电发电过多而出现蓄水短缺。(3)其他集水区出乎意料和完全不可预测的径流导致河口流量“溢出”(S)。调蓄水库只能是防止这类溢流的措施之一。(4)流域水管理中的调度，如减少河流引水需求，导致各协会“保护性”超调，进而导致水库库容更大的缺口。(5)水库库容管理的“防洪体系释放”不适用于这些流域。

This research reveals facts and logics of water shortage in a large-size basins as follows;(1) Too much optimistic water management in early autumn after typhoon season on the basis of future runoff expected in normal year caused water shortage of carry-over stored storage in reservoirs. In the Yodo river basin this type of shortage typically occurred in some drought years.(2) Too much optimistic expectation of runoff caused by melted snow in a basin on flow discharge basis caused shortage of water storage in reservoirs in all basins due to over generation of hydroelectric power.(3) Unexpected and precisely unpredictable runoff in the other catchment areas resulted in "over-spill" flow discharge at river mouth(s). A regulating reservoir can be only one measure to save this kind of spill.(4) Such regulation in basin-wide water management as decrease in diversion requirement of river water resulted in "protective" over-diversion by every association and sequentialy in eralier defecit of storage in reservoirs.(5) "Release for flood control systems" of reservoir capacity management can not be applicable in these basin.