Study Of Apparent Pollution Variation And Related Independent Factors In Slow Landscape River

Urban scenic river is one of the most important landscape water,landscaping design for environmental and bringing us pleasure of feeling,As a result,good apparent properties should be the most rudimental characteristic of Urban landscape water.But most of the Urban scenic rivers are quiescent or illiquid slow-flow water,the ability of self-purification of water body is weak,easily polluted by domestic sewage,rainwater and garbage,lead to water apparent worsen, water muddy,low transparence,often appear colour of made person feel unwell and with peculiar smell at the same time,much so that water blackening and smell or water bloom and so on.therefore lose the function of landscape water.This paper take the river of Suzhou Science and technology Institute river maple tree school as an example,study the apparent pollution variation and related independent factors in slow Scenic River. Depending on the usual practice appraise to water,the sensory quality of water is divided into seven parts (excellent,well,ordinary,range, bad,worse,baddest),The apparent pollution variation were analyzed by real-time observing slow scenic river.The apparent pollution related independent factors were analyzed by contrast the apparent pollution of scenic river with different characteristics.Through the long-term observation analysis andfinding:(1)Through the real-time and long-term observation of organoleptic quality in slow scenic river,have grasped the reality apparent pollution of four typical sections of scenic river. Over the whole study period, The apparent pollution of scenic river is worst in which discharge a large number waste water into and endogenesis bottom sediment , about 98.6% of average and below-averag. The apparent pollution of scenic river is serious in which grassland and cropland were the main concrete road and roof, about 90.5% of average and below-averag. The apparent pollution of scenic river is best in which without exogenous and grassland and cropland were the main grassland, about 90.6% of average and above-average.(2)Analyse the apparent pollution variation in this four typical sections of scenic river when observing this work in progress.Gradually stability in which without exogenous and grassland and cropland were the main grassland,appear range aesthetic quality in temperature rise(may-june);there were many undulations in which grassland and cropland were the main concrete road and roof,the best sense appear in winter ,worst in summer and autumn. Gradually stability instability in which discharge a large number waste water into and endogenesis bottom sediment,as the time by,its apparent pollution became worse and worse.(3)The effects of environment factors (air temperature illumination) on the apparent pollution were studied,it is find that four scenic rivers emerge different apparent pollution in the same weather conditions,therefore temperature and illumination are not the direct factors of affect pparent pollution.There are apper water bloom in three rivers,other did not happen water bloom.(4)The contrastive analysis rainfall runoff affect the apparent pollution,found that runoff mode of concentrate,small volume river,large runoff flow and bad rainfall runoff water would aqqravate apparent pollution of scenic river.With the rainfall and rainfall intensity get larger, rainfall runoff affect apparent pollution become bigger.when rainfall over 2.77 millimetre and rainfall intensity over 3.61 millimetres per hour,the water quality grade go up.(5)In the process of apparent pollution,key factors are external source (domestic sewage),rainfall runoff and endogenesis(bottom sediment),on conditional that without outside branch water mix,external source result in severe apparent pollution;on conditional that without external source,the former land-use of sight river are roadbed and roofing,it is easy suffer serious apparent pollution for rainfall runoff.