长江黄河上游地表水溶解氧时空分布特征研究--以四川省为例

Spatial and temporal distribution characteristics of dissolved oxygen in surface water in the upper reaches of the Yangtze River and the Yellow River--Taking Sichuan Province as an example

为了解长江黄河上游地表水中溶解氧(DO)的分布特征,以四川省河流湖库作为研究对象,通过收集整理四川省237个站点(断面)的DO逐月数据,研究分析DO的时空分布特征及其与外界环境因素的相关性。结果表明,四川省河湖DO在空间上总体呈现东高西低、南北高中部低的分布特征,在时间上呈冬季>春季>秋季>夏季,其中7月最低,全年DO低于5 mg/L的月份主要出现在3—9月,以春夏季为主,发生率为0.83%。从与外界环境相关性上看,DO浓度平均值与河流海拔呈负相关,DO浓度最高值与社会经济发展呈正相关,DO浓度最低值与社会经济发展呈负相关。

To understand the distribution characteristics of dissolved oxygen(DO)in surface water in the upper reaches of the Yangtze River and the Yellow River,rivers,lakes,and reservoirs in Sichuan Province were selected as the research objects.By collecting and arranging monthly DO data from 237 automatic water quality monitoring stations(water quality monitoring sections)in Sichuan Province,the temporal and spatial distribution characteristics of DO and the correlation with external environmental factors were studied and analyzed.The results reflected that the spatial distribution of DO in rivers and lakes in Sichuan Province was generally characterized with a high value in the East and a low value in the west,a high value in the north and south,and a low value in the middle.In terms of time,the DO content showed winter>spring>autumn>summer,and the lowest concentration was in July.The months with DO concentration below 5 mg/L mainly occurred from March to September,mostly during the spring and summer,with an occurrence frequency of 0.83%.In terms of relevance to the external environment,the average concentration of DO was negatively correlated with the river altitude.The highest DO concentration was positively correlated with socioeconomic development,while the lowest DO concentration was negatively correlated with it.