Research On The Law Of Soil And Water Loss In Cinder Yard

Nearly 59% fly ash is accumulated in cinder yard in our country, as a result the newly occupied ash area increases 3.0 x 103 hm2 every year. Ash slag has low water retaining capacity due to its good air and water permeability. So when the rain falls, the loss of ash will impact on surrounding environment. It brings out serious influence on the life and health of surrounding people. At the same time, it also has become one restrictive factor of ecology civilization construction in China.This paper studies the law of soil and water loss in cinder yard to provide technical support and theoretical guidance for the vegetation reconstruction and ecological recovery in Jiangxi province, and accumulates experience and basic data for environmental protection and the control of large scale cinder yard in our country.The research objective: De’an Ash slag runoff District in the eco-scientific park in JiangxiTo deal with: the quaternary red soil exposed area in the abandoned slag runoff district for treatment 1, the ash slag exposed district in the electronic factory for 2,the ash slag covering seeding grass irrigation district in electronic factory for processing 3, the ash slag spray seeding grass irrigation district in electronic factory for processing 4.The following conclusions are drawn after study the characteristics of the runoff and sediment and response to the rainfall factors under 4 measures in these 4 districts.（1） During the whole year of 2014, there were totally 159 times of rainfall, the total rainfall was 1635.3mm, it rained totally 791.09 hours, the average rainfall intensity was 2.07mm/h, the maximum I₃₀ reached 67.2mm/h, the cumulative rainfall erosion force was 7808.69 MJ·mm·/（hm2·h）. Although the rain times was not the highest and last time was not the longest, the largest rainfall affected the runoff and sediment yield was also relatively largely, which resulted in the runoff and sediment in July.（2） In these 4 measures, in July we encountered the largest runoff. The rainstorm brought out the largest runoff based on different grade of rainfall. The sediment loss was the largest in July based on the months’ observation. Rainstorm created the largest sediment based on different rainfall grade.（3）The runoff was increased by the increase of rainfall amount, rainfall duration, I₃₀, rainfall erosion force. It had the closest relationship with rainfall, and loosen relationship with the rainfall duration. The relationship between runoff and rainfall, I₃₀, and rainfall erosion force was linear. And the relationship between the rainfall duration was not obvious. The sediment loss was increased by the increase of rainfall, rainfall duration, I₃₀, rainfall erosion force, runoff. It had the closest relationship with rainfall, and loosen relationship with the rainfall duration. The relationship between sediment loss and rainfall, I₃₀, and rainfall erosion force was linear. And the relationship between the rainfall duration was not obvious.（4） We found the largest amount of the runoff, sediment loss, soil erosion in No.4 red soil bare area and the sequence for runoff, sediment loss, and soil erosion in 3 different areas is like this: the ash slag covering seeding grass irrigation district in electronic factory > the ash slag exposed district in the electronic factory> the ash slag spray seeding grass irrigation district in electronic factory >the ash slag spray seeding grass irrigation district in electronic factory. Water and soil conservation benefit kept the best in the ash slag covering seeding grass irrigation district in electronic factory; it had the relationship with the soil, ash physical appearance, vegetation cover.