special conditions: disturbed landscapes Flashcards
Any portion of land surface that has been drastically altered, and is not in an attractive, stable, or productive condition
Disturbed Landscape
Two (2) problems in disturbed landscapes
- Topsoil formation and the threat of erosion
- Water pollution
This contains important soil fauna and bacteria that are active in maintaining aeration, water infiltration, root penetration, and transforming minerals into forms useful to plants. (Clearly the most valuable and limited natural resource which has to be managed with great care and responsibility)
Topsoil
Fundamental objectives of reestablishing a disturbed landscape.
- To provide a viable growing medium (soils, water, suitable slopes) to the altered site
- To select or encourage appropriate vegetation
Principles and basic measures of controlling and limiting the effect of disturbances
- Through the protection of soil, water quality, and adjacent undisturbed areas
- Through landscaping and stratigraphy
- Through surface conditioning
- Through planting
These can be provided to limit the size of disturbances during construction
- Barricades
- Boundary marker
Ways to protect disturbed surfaces from erosion as soon as possible
- Covering
- Mulching
- Seeding
Ways to keep storm run-off velocities low
- Roughening surfaces
- Constructing check dams
Ways to protect disturbed surfaces from storm run-off
- Diversion ditches
- Dikes
- Conduits
Ways to retain sediment on-site
- Sediment ponds
- Silt fences
- Filter boxes
- By using chemical flocculents
This involves the creation of reasonable slopes wherein, slopes are chosen in accordance with land-use objectives
Landshaping
Surface-roughening methods of concentrating precipitation
- Gouging
- Dozer basins
- Chiseling
Refers to the layering of sub-surface materials
Stratigraphy
_____________ is concerned with the chemical and physical nature of the top several millimeters of growth medium
Surface Conditioning
This is added to modify acidic soil
Lime
This is added to improve the soil’s water retention capacity
By adding organic matter such as compost
Methods of surface conditioning (List 9)
- Ripping Subsoil
- Laying Down Topsoil
- Ripping Topsoil
- Disking
- Placing Fertilizer
- Harrowing
- Drill Seeding
- Placing Mulch
- Crimping Mulch
Any unwanted, unpleasant, loud, or harsh sound in the landscape
Noise
This refers to the level at which sound becomes unpleasant, disturbing, or annoying to people by:
- interfering with communication, sleep, and other everyday activities;
- causing physical discomfort, and damage to hearing;
- leading to the reduction of human efficiency and deterioration of physical and emotional well-being
Noise Pollution
These are generated by an pulsation or vibration of a source.
Sound Wave
The rate of repetition of soundwaves is referred to as ___________
Frequency
Measurement of sound by the use of logarithmic scale
Decibel
Sound level in dB (A) wherein pain begins
Greater than 120 db(A)
Three (3) Categories of Noise Control Strategy
- Source of the Sound
- Path and distance of the sound transmission
- Receiver of the sound
