grass planting and other bioengineering.pptx

Very informative

1. 1 Bio- Engineering Techniques Introduction/Definitions/Concepts Bioengineering is the application of engineering design and technology to living systems. It is the use of living vegetation either alone or in conjunction with civil engineering structures and non living plant materials to reduce shallow seated instability and erosion on slopes. (GEU, 1997a) Bioengineering techniques used in combination with civil and social engineering measures can reduce the overall cost of landslide mitigation considerably (Singh 2010). In the bio-engineering, the living plant materials, i.e. stems and branches, act as the reinforcements in the soil mantle in the beginning and then stabilization occurs as a result of adventitious rooting that develops along the length of the buried stems.

2. Fig: Life span of small civil engineering and vegetative structures, assuming good maintenance Bio- Engineering Techniques Introduction/Definitions/Concepts: It offers an environmentally friendly and highly cost and time effective solution to slope instability problems in mountainous and hilly areas. It is a technique of choice to control soil erosion, slope failure, landslides, and debri flows, and thus ultimately to help minimize the occurrence of floods and flash floods.

3. 8/24/2021 SOIL AND WATER CONSERVATION ENGINEERING, UNIT 3: BIO-ENGINEERING TECHNIQUES 5 Bio- Engineering Techniques s Introduction/Definitions/Concepts: It offers an environmentally friendly and highly cost and time effective solution to slope instability problems in mountainous and hilly areas. It is a technique of choice to control soil erosion, slope failure, landslides, and debri flows, and thus ultimately to help minimize the occurrence of floods and flash floods. Fig: Life span of small civil engineering and vegetative structures, assuming good maintenance SOIL AND WATER CONSERVATION ENGINEERING, UNIT 3: BIO-ENGINEERING TECHNIQUES 6 Bio- Engineering Techniques Functions: Functions of Bio-engineering techniques can be categorized broadly as: Engineering Functions and Hydrological Functions Engineering Functions: Catch : Catching the debris Armour : Armouring the surface (veg. cover) Reinforce : Reinforcing the soil Anchor : Anchoring the surface layer Support : Supporting the slope Drain : Draining the materials “CAR AS TRAIN” SOIL AND WATER CONSERVATION ENGINEERING, UNIT 3: BIO-ENGINEERING TECHNIQUES 7 Bio- Engineering Techniques Functions: Hydrological Functions: Restraint : Dense network of coarse and fine roots restrain soil particles Absorption : Roots absorb water Infiltration : Plants and their residue helps to maintain porosity and permeability Interception : Intercept raindrops; protect from splash Stem flow : Portion of rainwater is intercepted and flows along the branches and stems. Surface runoff reduction Evapotranspiration “RAISE IS 2” SOIL AND WATER CONSERVATION ENGINEERING, UNIT 3: BIO-ENGINEERING TECHNIQUES 8 Soil and Water Conservation Engineering, Unit 3 3 Bio- Engineering Techniques Function: Planting shrubs and trees reinforces and anchors the slope by establishing a community of larger plants. Species: Shrubs: Areri, Dhanyero, Kanda phul, Keraukose, etc. Trees: Bakaino, Chilaune, Khayer, Sisau, Siris (Rato, Kalo), Painyu, etc. PLANTS AND PLANTING TECHNIQUES Shrubs or trees are planted at regular intervals on the slope. As they grow, they create a dense network of roots in the soil. The main engineering functions are to reinforce and, later, to anchor. In the long term, large trees can also be used for slope support.