tailieunhanh - Evapotranspiration covers for landfills and waste sites - Chapter 4

Sự thoát hơi nước (ET) bao gồm bãi rác là một thiết kế sáng tạo với hai đặc điểm quan trọng: • Nó sử dụng hệ thống tự nhiên với các lớp không có rào cản. • Các phép đo cho thấy các khái niệm đó đã thành công trong hệ thống tự nhiên cho nhiều thập kỷ và thế kỷ. 4,1 Định nghĩa Các bãi chôn lấp bao gồm ET làm việc với các lực lượng của thiên nhiên Thay Thần Cố gắng để kiểm soát 'em. Nó Sử dụng một lớp đất có nguồn gốc Bao bởi chất béo và nó. | 4 Evapotranspiration Landfill Covers The evapotranspiration ET landfill cover is an innovative design with two important characteristics It uses natural systems with no barrier layers. Measurements show that the concept was successful in natural systems for decades and centuries. DEFINITION The ET landfill cover works with the forces of nature rather than attempting to control them. It utilizes a layer of soil covered by native grasses and it contains no barrier layers Figure . The ET cover uses two natural processes to control infiltration into the waste 1 the soil provides a natural water reservoir and 2 natural evaporation from the soil and plant transpiration ET empties the soil water reservoir. At most sites it is easy to build the ET cover to allow small or large percentages of annual precipitation to enter the waste. It is an inexpensive practical easily maintained and self-renewing biological system. The ET cover will remain effective over extended time periods perhaps centuries. Minimum Requirements and Function The ET cover differs from vegetative covers because it requires optimization of both cover soil properties and the plants grown on the cover. The vegetative covers described in the literature require neither resulting in failure as described in Chapter 3. The ET cover has the following minimum criteria The soil should hold enough water to minimize water movement below the cover and meet the requirements of the site. The soil should support rapid and prolific root growth in all parts of the soil cover. The vegetation established on the cover should be native to the site adapted to the soil in the cover and compatible with site remediation goals. Because of these criteria design and construction methods for ET covers differ from both conventional barrier and recently reported vegetative covers that failed see Chapter 3 . ET covers need no barrier layers because the soil provides a reservoir that stores and holds infiltrating water. .