Stream debris restraining structure

Abstract

A structure for restraining debris in a stream, including lateral walls, which delimit between them a flow section in a bed of the stream. This flow section includes an upper portion that includes set between the lateral walls, a structure for retaining material arriving from upstream, and a lower portion that identifies an opening for outflow.

1 . A structure for restraining debris in a stream, comprising lateral walls, which delimit between them a flow section comprised in a bed of said stream, wherein said flow section includes an upper portion comprising, set between said lateral walls, a structure for retaining material arriving from upstream and a lower portion defining an opening for outflow. 
     
     
         2 . The structure according to  claim 1 , wherein said retaining structure comprises a reticular structure. 
     
     
         3 . The structure according to  claim 1 , wherein said lateral walls delimit said flow section extending it to the entire width of the stream bed. 
     
     
         4 . The structure according to  claim 1 , wherein said lateral walls extend in the stream bed and delimit said flow section limiting it to a partial width of said bed. 
     
     
         5 . The structure according to  claim 1 , wherein said flow section is delimited at the bottom by a slab. 
     
     
         6 . The structure according to  claim 2 , wherein said reticular structure comprises a metal wire net. 
     
     
         7 . The structure according to  claim 2 , wherein said reticular structure comprises elastic rings. 
     
     
         8 . The structure according to  claim 2 , wherein said reticular structure comprises a net of ropes. 
     
     
         9 . The structure according to  claim 1 , wherein said slab and/or flow section are made of concrete or steel-cladded concrete or with bound rocks or boulders. 
     
     
         10 . The structure according to  claim 1 , wherein said flow section has, in the upper portion, said retaining structure, in particular said reticular structure, up to a height, with respect to the stream bed or to the slab, that is a function of a given maximum value of deposit upstream of the structure, in particular of a dimensionless ratio between the maximum value of deposit and the hydraulic head. 
     
     
         11 . The structure according to  claim 1 , wherein said flow section has, in the upper portion, said retaining structure, in particular said reticular structure, up to a height with respect to the stream bed or to the slab, that is a function of a contraction coefficient of a vena contracta section downstream of the flow section. 
     
     
         12 . The structure according to  claim 1 , wherein said retaining structure, in particular said reticular structure, is inclined in the downstream direction, in particular by an angle of between 10° and 30°. 
     
     
         13 . The structure according to  claim 1 , wherein said lateral walls delimit said flow section extending it to the entire width of the stream bed in the portion corresponding to the retaining structure, in particular the reticular structure, and delimit said opening of the flow section, limiting it to a partial width of said bed. 
     
     
         14 . A method for restraining debris in a stream, which envisages providing lateral walls, which delimit between them a flow section comprised in a bed of said stream, said method being comprising providing a restraining structure comprising said lateral walls, which delimit between them a flow section comprised in the bed of said stream, wherein said flow section includes an upper portion comprising, set between said lateral walls, a structure for retaining material arriving from upstream and a lower portion defining an opening for outflow.