滦河不同季节悬浮颗粒物特征差异及原因解析

Characteristic Differences and Reason Analysis of Suspended Particulate Matter of Luanhe River in Different Seasons

为明确不同季节河流悬浮颗粒物的特征差异,2018年7月(雨季)及12月(旱季)采集滦河上覆水及悬浮颗粒物样品,通过试验探究了滦河悬浮颗粒物在不同季节水环境及水动力背景条件下的特征差异,并对其原因进行解析。结果表明,滦河旱季较雨季水质差,流速低,旱季悬浮颗粒物微观形貌较雨季复杂,表面覆盖有更多的有机裹层,但均呈现出内部无机矿物颗粒的特征,滦河旱季悬浮颗粒物较雨季更易发生悬浮。水环境及水动力条件的变化能够引发悬浮颗粒物的复杂响应,造成其微观形貌及运动特征的变化,与此同时,滦河以河道采砂为主的人类活动方式对悬浮颗粒物的特征也产生了重要影响。

In order to clarify the characteristic differences of suspended solid(SS)in rivers in different seasons,the overlying water and SS samples of Luanhe River were collected in July(rainy season)and December(dry season)in 2018,to explore the characteristic differences of SS under different seasonal water environment and hydrodynamic background conditions,and analyze the reasons.The results show that in arid season,the water quality was poorer,the flow rate was lower.Compared with rainy season,the microstrcture was more complex and larger amount of organic coating were attached onto SS,and the SS were observed to show the characteristics of internal inorganic particles in both seasons.Meanwhile,SS was more likely to be suspended in the dry season than in the rainy season in Luanhe River.The change of water environment and hydrodynamic conditions can induce complex responses of SS,which can change the microstructure and motion behavior of SS.At the same time,the human activity mode of Luanhe River,which was dominated by sand mining,has an important impact on the characteristics of SS.