Poyang Lake Hydrology And Hydrodynamic Characteristics Analysis In Typical Year Based On EFDC

In this study, use the Poyang Lake as the research object; select the U.S. EFDC forhydrodynamic model simulation in study area，After model validation, simulationresults in line with the actual situation. As part of the973project, in this paper, thewet, average and dry year established by the Yangtze River Water ResourcesCommission which determined in accordance with the flow of the Yangtze River. Thisarticle mainly use EFDC model2000(average year),2004(dry years),2010(wet year)level, depth and velocity data to simulation Poyang Lake hydrodynamic. Usingsimulation results analysis difference areas of Poyang Lake’s hydrodynamiccharacteristics in In February (dry season) and July (wet season). Focusing on thehydrology of two nature reserves which include water level, depth, flow field, depthrhythm changes analysis of rhythm. The main conclusions of this article as follows:(1) Similar to the average monthly water level and depth of the typical three yeartrends are minimal in January, July maximum, January to July increased gradually anddecreased after July. The average depth of fluctuations in rainy years, As can be seenfrom the average velocity of three typical year that flow rate from January to June issignificantly greater than July to December, the flow rate of water in wet years isgreater than in dry years.(2) January level in three typical years were indifference. Water level variesgreatly in different regions: two protected area’s water level above at11m, the waterlevel of the north river channel at5m below in dry year and wet year, in average yearwas6.3m. In July the regional level difference is small, but wet years the water levelreaches18m, more than in dry years and average year. Average year and wet year’water depth were difference in February, but in dry year, most places without water.From a regional point of view, north river channel was deepest in three typical years,the other regional had smaller differences. July wet year was much larger depth thanother years. Size and regional distribution of velocity had large differences inFebruary, which was maximum velocity in wet years; the average year wasminimal.From a regional point of view, the largest flow was in the north river channel,the smallest in two protected areas. Velocity in size and distribution were smalldifference in July.(3) By comparing the three years flow of Hukou shows that Maximum number ofdays and maximum flow intrusion appears in dry years, average year secondly, nointrusion phenomenon wet years. In2000, the time of intrusion occurred July7-9,July22-27, for a total of9days. The average amount of intrusion is805m3/s. In2004, the time of intrusion occurred July20-July27,2009, September10-September15, for a total of14days, the average amount of intrusion is3350m3/s.(4) The proportion of anhydrous region gradually increasing in three typical yearsof each functional area of Wucheng nature reserve. The difference is the core area in2000and2004has all been flooded in several months, but did not in2010. the dry area in the core area of three years is smallest, the largest in absolute ratio in Corearea in2000,2004,2010respectively33%,76%,77%; experimental area was75%,90%,90%. A buffer between the two areas. Anhydrous distribution ratio of eachfunctional area in three typical years of the Southern Rocky Mountain Nature Reservearea is similar. The proportion of flat water slightly smaller than the wet and dryseasons. The core area of the maximum anhydrous area ratio in2000,2004and2010is respectively57%,95%, above99%. The proportion of anhydrous area of more than50%in three years respectively December, early October and early November.