四川主要山区河流设计最高通航水位标准探讨

Standard for design highest navigable water level of main mountainous rivers in Sichuan province

山区天然河流的洪水期水位暴涨暴落、洪峰历时较短,针对海事部门划定的禁航水位(或禁航流量)一般低于国标的要求水位,可以适当降低通航建筑物最高通航水位以节省工程投资,需要探寻山区性河流设计最高通航水位的合适标准。选择四川省内7个和重庆市内4个水文站的水文资料进行计算分析,结果表明:将频率法直接改为保证率法难以控制水位降幅,适当降低洪水重现期标准是可行与合适的。

The flood peak level ofmountain river changes abruptly and the lasts short. Since the forbidden level stipulated by the maritime sector is generally lower than the national standard,we can decrease the maximum navigable water level of navigation structures to save construction investment. Thus we need to explore the appropriate standard.Analyzing the hydrologic data of 7 hydrometric stations in Sichuan province and 4 hydrometric stations in Chongqing city,we draw the conclusion that it is difficult to control the stage drop adopting the guarantee rate method instead of the frequency method directly,and it is feasible to lower the standard of the flood return period appropriately.