近20年来西北江三角洲主要水道水量分配比规律分析

Analysis of water distribution ratio for main waterways of Northwest River delta in past 20 years

以实测水文资料为依据,计算分析近20年来西北江三角洲主要水道的水量分配比分布规律,并给出具体分配值。分析结果表明:近20年来马口、南华站洪季的水量分配比枯季大,三水、天河站则相反,天河站洪季和枯季的水量分配比都较南华大;东四口门洪季的水量分配比枯季高,而西四口门则相反,网河区河汊的水量分配比总体变动幅度不大。研究发现,西北江三角洲主要水道水量分配比的变化与各分流节点的过水面积变化以及上游来水水情密切相关。

Based on the measured hydrological data,analysis and calculation was made on the regularity and actual values of water distribution ratio of the waterways in the Northwest River delta.The results of analysis demonstrate the water distribution ratio in flood season is higher than that in dry season at Makou Station or Nanhua Station,while it is the oppsite at Sanshui Station or Tianhe Station;the ratio of Tianhe Station is higher than that of Nanhua Station in either flood season or dry season;the ratio of East Fourth Gate in flood season is higher than that in dry season while that of West Fourth Gate is the opposite;the water distribution ratios of river branches generally vary slightly.The water distribution ratio of main waterways in Northwest River delta is closely related to the discharge area of split-flow node and upstream runoff water regime.