Method for constructing ecological flood control embankments in medium and small watersheds

Abstract

The invention discloses a method for constructing ecological flood control embankments in medium and small watersheds. The method comprises the following steps: (1), calculating the maximum scouring depth deltaD of a riverbed; (2), calculating the local scouring depth hb; (3), calculating the lengths of tree stumps; (4), smearing the surfaces of the tree stumps with tung oil with the thickness of1-5mm, and drying in sunlight for use; (5), then, arranging the tree stumps on the riverbed of a concave river bank in the downstream direction of a water flow according to the certain density, the certain buried depth and the certain scale, and then planting shrub willows between the tree stumps and a concave bank slope according to the certain density and the certain scale. The ecological embankments for the concave river banks, constructed by the method provided by the method, can effectively deal with the problems of collapse of the concave river banks during river water erosion and the like.

Description

technical field [0001] The invention belongs to the technical field of environmental protection engineering, and in particular relates to a construction method of an ecological flood embankment in a small and medium watershed. Background technique [0002] Slope erosion is the erosion of river channels under natural conditions, such as water flow. Bank collapse is the most common form of erosion. Due to the anti-corrosion performance of the soil and the large slope, the slope foot is eroded by the water flow during the flood period and the slope collapses. The curved concave bank is the most severely eroded part of the slope. Since the water flow along the curve is affected by centrifugal acceleration, lateral gradient and secondary flow are generated. The existence of the spiral flow makes the sand concentration and particle size at the concave bank of the bend smaller, and the sand concentration and particle size of the water flowing to the convex bank are larger. For l...

AI Technical Summary

Problems solved by technology

Hard revetment can stabilize the river regime to the greatest extent, but it will hinder the interaction of material, energy and information between the land and the river. Plants and aquatic animals will lose the environment for survival and reproduction, and the self-purification ability of the river will be weakened. The balance of the system is destroyed, so it is necessary to seek a reasonable, economical, stable and ecological flood protection embankment construction technology

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