利用饶河流域 1952- 2014 年 3 个水文站的实测流量、输沙量资料, 分析了饶河流域年径流量、年输沙量的变化 特征。结果表明: ( 1) 饶河流域从径流和输沙地区组成来看, 昌江、乐安河、信江东大河占比在 20% ~ 35% 之间, 输沙量 和径流量成正比; ( 2) 饶河流域径流量年际变化较大, 20 世纪 90 年代水量异常偏多( + 20%) , 径流、输沙序列存在 20 年的周期, 但未来径流量表现为明显的随机性; ( 3) 输沙量在 1998 年后显著减少, 导致水沙双累积曲线发生转折, 未来 输沙量可能继续减少; ( 4) 2000 年后径流量偏少( - 10%) 是输沙量减小的原因之一, 1998- 2007 年间建成的大中型水 利工程拦截泥沙, 是饶河 2000 年后输沙量异常偏少的另一个主要因素。由于流域水土流失治理、水利工程建设等, 预 计今后饶河干支流输沙量仍将进一步减少。研究结果可为饶河流域水资源综合利用开发和水生态保护提供参考。

Based on the daily measured dischar ge and sediment data of three stations in Raohe River basin from 1952 to 2014, we studied the variation characteristics of the annual runoff and sediment transport. The results showed that: 1) In terms of the reg ional composi2 tion of runoff and sediment transport in the Raohe River basin, the Changjiang River, Lecan River, and Dong dahe River took up 20%2 35% , and the sediment transport and the runoff were directly proportional to each other. 2) The r unoff in the Raohe River basin show ed prominent interannual variations. The flow in the 1990s was g reater than the normal lev el ( by 20% ) . The main perio d of the r unoff and sediment tr ansport series w as 20 years, but the future runoff showed pr ominent r andomness. 3) The sediment load declined significantly after 1998, causing a tur ning point on the do uble accumulative curve of runo ff and sediment. The future sediment load mig ht keep declining. 4) One of the reasons for the r eduction o f sediment load in Raohe Riv er basin w as the reduct ion of runo ff after 2000 ( by 10% ) . Another main factor w as the int ercept ion o f sediment by la rge and medium water co nserv ancy pro2 jects built betw een 1998 and 2007. Ow ing to t he contro l of soil erosion and constructio n of w ater conservancy projects, the sedi2 ment in Rao he River basin is ex pected to decline further in the futur e. The results can pro vide a r eference for the comprehensiv e utilization and dev elopment of w ater r eso ur ces and t he w ater ecolog ical pro tection in Rao he River Basin.

国家自然科学基金(41501046; 41771044) ;广东省水利科技创新项目(2014214; 2016214) ;广东省自然科学基金( 2015A030310234)