Contract notice: definition study of morphological restoration actions on the loire river by reactivation of lateral erosion
Main features: this consultation in an adapted procedure is subject to the provisions of article 42 of order no2015-899 of 23 july 2015 and articles 27 and 77 of decree no2016-360 of 25 march 2016.This contract consists of a firm tranche composed of two phases and an optional tranche: - phase 1 (firm phase): search for additional sites of interest for lateral erosion - phase 2 (firm phase): proposal of scenarios to define the work to be done to mobilize the materials present in banks and production of a preliminary draft of the interventions to be carried out on each site, - phase 3 (optional slice): update of the photo report carried out by the dde in 2000
It predicts the future geomorphology which will be formed by lateral erosion of the drainages.
In an area of much more advanced erosion, called old stage, vertical erosion is not important and lateral erosion becomes expressive.
Vertical Etching and Lateral Erosion. To investigate the relationship between the antireflection ability and the depth of the Si-hole, the diameters of Si-holes were controlled to about 300 nm, which is much close to the period of the Si-hole array (diameter of unetched PS sphere, about 310 nm).
There is lateral erosion in the Si etching process considering that the corresponding diameters of Cr-masks were 244nm, 219nm, and 191nm, respectively.
On slopes with crystalline shists, gneiss, paragneiss in composition appears geomorphological processes of lateral erosion
in Valsan catchment, rill wash on slopes with medium values, creeping on steep slopes; tumble down on rocky slopes and landslides on slopes with medium values with consistent layers of depositions.
This can cause extreme pain and lateral erosion
in the joint.
A erosao do leito e denominada erosao vertical e a das margens erosao lateral ("lateral erosion
") de acordo com Tuysuz (2005).
The shallow diluvium landslides occur in steep slopes, nearly always in direct connection with lateral erosion
of the streams, being thus closely related to the bank scouring.
Channel position or the interaction of soils with cover type or channel position did not influence lateral erosion
, but the interaction of channel position with cover type was significant.
A direct effect of lateral erosion
of the river is the decrease of water depths, especially at low-water periods, thus negatively affecting inland waterway transport.