长江大通站水沙过程的基本特征 Ⅰ. 径流过程分析

长江河口是河海相互作用中河流因子占主导地位的典型河口之一，流域水沙过程及其变化对河口环境演变有重要控制作用.运用时间序列分析方法研究大通站的径流过程基本特征，分析表明，1923年以来大通站的径流序列无明显的趋势变化，但在1955年、1988年前后分别呈现较明显的径流减少和增加的跳跃变化，并具有16年、7年的周期变化特征.该文同时对月均流量的分配型态和洪枯季水情丰枯的匹配状况及其原因作了初步探讨.

The Basic Character on Process of Runoff and Sediment Discharge at Datong Station of the Changjiang River Ⅰ.Analysis on Runoff Process

The Changjiang estuary is a typical estuary that fluvial factors plays a dominant role in fluvio-marine interaction. The process and its variation of runoff and sediment discharge have situation under control in respect of evolution of the estuarine environment. This paper studies main characters of runoff process at Datong Station with methods of time-series analysis. It is stated that the runoff series at Datong Station has little change trend since 1923, but a jumped decrease near 1955 and a jumped increase near 1988 have emerged. Meanwhile, it has a certain appearance of periodic variation with around 16,7 years. The distribution patterns of monthly flow, the matching state of high or low water between flood and dry season as well as the relevant causes are also discussed in the paper.