Study On The Application Of Soil Bioengineering Technology In Natural River Management

In the past,the treatment technology of River Creek is mainly made up of masonry or dry stone masonry,cast-in-place concrete,precast concrete block,and so on.Soil bioengineering river near natural control based on,is the use of a variety of natural materials to construct the riverbank,such as plants,soil and stone,stems and branches by plant roots,build a whole,realize the stability of the slope,water and soil conservation and river ecosystem improvement.In the context of the current ecological governance and protection of rivers,the first problem is how to set the goal of river management,to define what kind of river is a natural or near natural river.Based on the relevant research results at home and abroad river near natural control,combined with the status quo of the suburbs of Wuhan River,on the basis of natural river evaluation,by comparing with the natural river analysis,diagnosis research section: main problems of Wuhan Dong Jing River,according to the principle of decision function of ecosystem structure,selection and the problem the corresponding control measures,carry out near natural control soil bioengineering River Based on experiment and demonstration in Wuhan.The main research contents and results of this project are as follows:(1)a complete set of river natural evaluation index system was established.Based on a survey of the river,from the actual situation of Wuhan Dong Jing River,according to the construction of the index system,index screening principle,established evaluation index system suitable for Wuhan Dongjin,evaluation system including the target layer,criterion layer,A B layer C index of these 3 layers,from the landscape,ecological and hydrological aspects selected corresponding,complementary quantitative and qualitative 22 indicators.Then use AHP as the evaluation method according to the specific value of natural evaluation of Wuhan East jinghe;(2)according to the target system of near natural management,the biological engineering treatment scheme was determined,including the improvement of river cross-section shape and the construction of plant buffer zone.At a distance of 5 meters away from the river floodplain,not only planting flooding-tolerant willow and other high tall trees,also established a floodplain spreading shrub group,not only can fix the surface soil,but also for the lower space of herbaceous plants to provide shelter growth,create favorable growth in hot and humid environment;water erosion the weaker section,we take the set of irregular riprap placed,the River straight back to song,and protect the coastal growth of plants and aquatic animal attachment of banks,effectively maintain the biodiversity.(3)analysis of treatment effect from plant adaptability.According to the characteristics of shrub willow and hair growth characteristics,the ecological restoration planting in Dongjin slope respectively by buried root,shrubs cushion,cutting,and other biological fascine planting methods,planting a month after the uneven growth of several methods of planting willow wool,shoot height and basal diameter growth significantly,the growth of shrubs the best hair mat planting willow,followed by buried roots,fascine.With the passage of time,in April,May and 13 months later,the vegetation on both sides of the Jinghe River was restored in a short period of time,and the biodiversity was very fast.(4)the application value of soil bioengineering in the near natural management of river from the engineering benefit analysis.In terms of security,Dongjin Mao Liu water submergence tolerance characteristics reflect is particularly prominent,even if only the water leakage of trunk 1/3 can grow normally,and can make the flow rate reduction of75%-80%,compared with the traditional river revetment engineering,soil biological slope protection project is the traditional slope protection project incomparable in ecological safety;now,in terms of test section of riparian vegetation is rich,leaves up to3 cm thick,Hanoi river fish,Hanoi new species increase;landscape,early several vegetation planting method used in slope bottom wire and stick mark has all gone,leaving only the beautiful scenery;the economic aspect,which lasted two months the river project,using five methods of hair root buried willow ecological revetment,and fill in other plants was later increased,all cost only 5 million yuan,after The cost of the management is also very small,and only a few surviving willow branches can be replaced,it is cheap and fine.