Study On The Spatial-temporal Evolvement Of Water And Land Resources In Jining Mining Subsidence Area And Filling Reclamation With Yellow River Sediment

With the rapid development of our economy, the demand for coal is on the increase, water and land resources problem become more and more prominent caused by coal mining. Based on the geographic information, remote sensing and mining subsidence prediction technique, using a variety of data in Jining city, this paper discussed mainly the influence of mining subsidence area spatial-temporal evolvement to Jining water and land resources, and the restriction mechanism and coordinative measures of the Yellow River sediment filling reclamation was preliminarily studied. The major results in this paper are as follows:(1) The paper constructed the estimation method of subsidence area, volume, based on the coal production. Combined with the probability integral model, mining subsidence prediction program of random shape face was developed, subsidence of Jining city was simulated and predicted. Using remote sensing, geographic information technology and other means, collapse waterlogged region extraction model was established, the change of collapse waterlogged information in Jining from 1984 to 2013 dry season was obtained.(2) According to mining subsidence prediction results and interpretation results of collapse waterlogged,analyzed the mining subsidence spatial-temporal pattern and its variation of Jining city, the research results show that: Along with the enhancing of mining activities, the scale of subsidence area is gradually expanding, but the growth rate in different years has a great difference, because of "subsidence and governance simultaneously" and other reasons in recent years, the growth rate is slowing down, subsidence areas are mainly concentrated in Yanzhou, Zoucheng, Weishan and other places, gradually expanded from point to surface, in other regions are mostly scattered and irregular shape; collapse waterlogged water acreage closely related with total output of raw coal and the location of the mine, collapse waterlogged regions are mainly concentrated in Yanzhou, Rencheng and other places, has been gradually contiguous.(3) The Influence source of coal mining subsidence on surface conflux is in the change of the terrain and topography, the mining subsidence prediction model combines with GIS hydrological analysis, confluence range extraction model and confluence water accumulation calculation model of mining subsidence area is established. Combined with the subsidence prediction results, analyzed the relationship between the dynamic mining process and surface conflux, the research results show that: subsidence area confluence area, bearing capacity of water accumulation and backwater capacity is increasing with the increase of total output of raw coal, but the growth rate is difference; the relative position between the subsidence and surface runoff and its topography, terrain conditions determine the subsidence area confluence area and backwater capacity.(4) According to the water diversion and sediment requirement of the Yellow River sediment filling reclamation controlling region in northern Jining at different time, from the perspective of water and sediment diversion capacity, construction time, sediment transporting capacity of the pipeline, sediment filling and drainage technology, analyzed the restriction mechanism of Yellow River sediment filling reclamation, and the corresponding improvement measures were put forward, the research results show that: water and sediment diversion capacity can meet the demand of land reclamation of newly increased subsidence area, but can’t meet the demand of land reclamation of current year, which can be governed gradually by the method of "first increment, after stock". Reclamation project should be extended to flood season and winter since the water from the Yellow River is not averaged over the year and a majority of the water from the Yellow River has been drained in spring. Sediment transporting capacity of pipeline is inverse proportional to the amount of pipeline, which can be enhanced by selecting equipment and optimizing parameters. Aiming at the problem of low efficiency of the existing sediment filling process, intended to adopt measures to speed up the settling velocity of sediment, improve the drainage efficiency such as "build cross bund", etc. At last, aiming at the problem of drainage channels for reclamation projects, put forward some solutions such as lead the water into the canal of the east line of south to north water transfer project, etc.