摘要
在北方地区,降水量时空分布不均,全年降水量的80%集中在汛期,径流量的年内变化与降水量基本一致。在时间分布上,不同时期的河流水质,受补给水源的作用,不同时期有较大的差异。枯季河流水源补给主要以地下水排泄补给,水质受地质结构和地质构造的影响较大;洪水期水源主要以地表径流为主,地表径流携带大量污染物进入水体,河流水质主要与流域下垫面因素有关。
In the north area of China,precipitation is not evenly distributed within a year.80% of the total annual rainfall is concentrated in the flood period.The variation of runoff is in line with rainfall.Water quality of rivers varies substantially in different periods due to the difference in supplying sources of river flows.In dry season,river water is mainly from the discharge of underground water and the water quality is subject to geological structure.In flood season,river water is mainly from surface runoff with a lot of contaminants carriedand the water quality is affected by underlying surface factors of watershed
出处
《南水北调与水利科技》
CAS
CSCD
2011年第2期123-125,156,共4页
South-to-North Water Transfers and Water Science & Technology
