深夜地黄昏
Loess Plateau is the world's largest loess area, China and the world is the most serious soil erosion areas. Because of severe soil erosion, causing not only a thousand myriad ditch, bare hill bald ridge topography and poor ecological environment, limiting economic and social sustainable development, but also a lot of sediment discharged, blockage downstream, the threat of great the safety of the lower Yellow River has become a scourge for thousands of years plagued the Chinese nation. "Yellow damage, root in the sand", and sediment 60% to 70% has come from the Loess Plateau gully TIMES 1000. Therefore, control and sediment control channel becomes the key to solving the problem of the Yellow River. Practice shows that Dam ecological engineering can not only effectively intercept sediment, Silting land reclamation, irrigation development, increase production, but also improve the ecological environment of the Yellow River long-term stability, promoting regional economic development and social progress, it is also because of its comprehensive function of ecological engineering Dam only by the local people's genuine support and strong support. However, there is more than 80% of the existing dam is the 20th century, before the mass movement in the 70's built, there is no unified planning, design, flood control standard is low, "a small brace of water ditch, water Dalian dam go," so that loess large dam projects plateau brutally serious damaged. Dam severely damaged in this case, in accordance with the spirit of the then Yellow River Conservancy Committee's request, we began to "the relative stability of the Loess Plateau Ecological Engineering Dam" in the pilot study. This study was conducted in the test channel backbone dam, medium, small dam layout, observing its operations, to maximize the development area of dam, in a 100 year frequency flood situation, observing changes in their storage capacity, sedimentation situation, and observing the growth of crops, and to observe different management degree slope, on dam safety to crops and its benefits and so on. Proposed dam system to achieve relatively stable, the most basic of the three conditions, namely: First, the relative stability factor must be greater than or equal to a certain allowable value, which is relatively stable dam system to achieve the key; Second, adequate flood protection capacity; Third Dam System security has not been dangerous. The results of the relative stability of the Dam construction to provide a scientific basis to solve the major issues of dam severely damaged, so that intercept sediment Dam System Loess Plateau, Lan Hong storage, increased farmland, the development of irrigation, promote reforestation and improve the ecological environment, adjust land use and industrial structure, flood control, protection of downstream farmland and public facilities as well as increasing people's income and other economic, ecological and social benefits in full play. Keywords: relative stability of dam on the Loess Plateau好长,,,论文摘要一般200字左右吧? 哪有你的那么多呀!!
刘李铭俊521
The loess plateau is the world's largest loess area, is also our country and even in the world the most serious soil and water loss of the region. Because of the serious soil and water loss, not only caused fragmented landform, TongShan TuLing topography and bad ecological environment, restricted the region sustainable economic and social development, and massive release of sediment, the downstream channel of siltation, great threat to the safety of the lower Yellow River, a problem the Chinese nation several thousand years of sting."The Yellow River to harm the, the root in the sediment", and 60% ~ 70% and sediment from in the loess plateau fragmented landform. Therefore, control and management of the channel sediment became the key to solve the problem of the Yellow River. Practice has proved, ecological engineering of dam system can not only effectively intercept sediment, silt place great, development, increasing irrigation 'income, but also can improve the ecological environment of the Yellow River basin, promote the stability and promote regional economic development and social progress, it is also because of its comprehensive function, of dam system ecological engineering by the local people to the real support and support.At present, however, more than 80% of the existing check before 1970 s is built in the mass movement, no unified planning, design, the flood control standard is low, "water small braces, dalian dam go ditch water", make the loess plateau in a large number of warping DAMS engineering were serious damaged by flood. In this warping DAMS serious damaged by flood, according to the requirements of the HuangWeiHui at that time the spirit, we started to "the loess plateau ecological engineering relative stability of dam system for the pilot study.This research is mainly in the test for the channel, medium and small dam backbone laid warping DAMS, observation the operation conditions, the maximum development area of watersheds, guarantee 100 years in in a flood, the capacity of observation change, the deposition, and the growth of crop planting observation, and want to observe different management degrees slope, closing the safety of the crop of the effect and the benefits, etc. Thus puts forward the relative stability of dam system to achieve, the most basic three conditions, that is: one is the relative stability coefficient must is equal to or greater than the allowable value of certain, this is relatively stable of dam system to achieve the key; Two is to have enough flood control ability; Three of dam system engineering safety is no seepage path.The results of the study on construction relative stability of dam system provides scientific basis, to solve the major problems of the damaged by flood serious warping DAMS, make the loess plateau ecological of dam system engineering intercept LanHong sediment, and water storage, increase the good land, water development, promote the reforestation, improve the ecological environment, land use and industrial structure adjustment, the flood control and disaster alleviation, protection of farmland and public facilities and downstream increase the income of the economic, ecological and social three performance got the full play.
小天使006
防汛：为了防止和减轻洪水灾害，在洪水预报、防洪调度、防洪工程运用等方面进行的有关工作。防汛的主要内容包括：长期。中期。短期天气形势预报，洪水水情预报，堤防、水库、水闸、蓄滞洪区等防洪工程的调度和运用，出现险情灾情后的抢险救灾，非常情况下的应急措施等。词目：防汛拼音：fáng xùn英文（水利）：flood defense其他解释[flood prevention or flood control] 在汛期采取措施,防止洪水泛滥成灾。引证解释指在江河涨水时期采取措施，防止泛滥成灾。《新华月报》1951年第7期：“防汛工作是群众性的工作，领导机关必须联系广大群众，才能做好这一工作。”
