Sediment silt up in reservoir is one of the important contents in key water control project , research on the effect and surrounding environment effected by patterns of enclose tideland for cultivation in key water control project , which has risen concerns of lots of departments 水库泥沙淤积是水利枢纽工程研究的重要内容之一，青铜峡水库库区淤积后滩地的围垦利用方式对水利枢纽工程的安全运行、效益发挥以及对周边环境的影响分析研究已引起各方面的关注。
According to the contrast between different maps and the dynamical conditions , the area of bohe lagoon had reduced by 45 . 3 % from 1932 to 2000 and human activities in the coastal zone , such as inning , sand dredging and aquiculture , have brought great effects on the coastal system , which has accelerated the barrier erosion and lagoon evolvement 通过对比分析， 1932 ~ 2000年，博贺?湖面积减少45 . 3 % ，人类活动已成为影响该区海岸演变的主导因素；滩涂围垦、海岸采沙与水产养殖等人类活动加剧了沙坝海岸的侵蚀后退，且使得?湖面积迅速减少，不断淤浅萎缩，大大加快了海岸体系的演化进程。
In the paper , ten satellite photographs from 1979 to 2001 are studied to contrast and analyze the distribution area of the coastal salt marshes in different period using the software of mapinfo 5 . 0 . it discusses the influence factors and basic laws of the coastal salt marshes along the unerosinal coast in jiangsu . at the same time , it also discusses the recover and rebuilding processes of the coastal salt marshes after the tidal flat was reclaimed 本文采取1979年2001年间共10个时相的盐城幅卫星影象，结合软件mapinfo5 . 0 ，采用卫片配准? ?数字化? ?叠合分析的方法，对历年来各个时相卫片上反映出来的海岸盐沼的面积大小及分布范围进行对比研究，初步探讨了江苏非侵蚀海岸盐沼消长的影响因素与基本规律，并探讨围垦以后盐沼的恢复与重建。
Refers to farmland which is plowed constantly for growing crops , including cultivated land , newly cultivated land in the current year , farmland left without cultivation for less than three years and fallow land in the current year , rotation land , rotation land of grass and crops , farmland with some fruit trees , mulberry trees and other trees and cultivated seashore land , lake land , and etc 指年初可以用来种植农作物、经常进行耕锄的田地，除包括熟地、当年新开荒地、连续撂荒未满三年的耕地和当年的休闲地（轮歇地） ，还包括以种植农作物为主并附带种植桑树、茶树、果树和其他林木的土地，以及沿海、沿湖地区已围垦利用的“海涂” 、 “湖田”等面积。
Effecting of enclose tideland for cultivation on water level in the same flow level are quantitatively analyzed , the main achievement and suggestions are given as follows : ( 1 ) the water level rise is the most which effected by enclose tideland for cultivation dyke when flow is 2000m3 / s , the max water level difference in case of enclose tideland for cultivation dyke or no arrives 0 . 66 m 定量地分析了围垦堤对同级流量下的库水位的影响，主要成果结论及建议如下： ( 1 ) 2000m ~ 3 /时库区围垦堤对水库水位抬升最大，有无围垦堤水库水位差最大达到0 . 66m 。
So according to the technology regulation of reclamation engineering , hydraulic calculation must be carried out in the design of final closure . this paper firstly introduces the progression and present situation of reclamation engineering , emphasizing on the features of present reclamation and on the experiences and theories of home and abroad ; using fortran perfects the hydraulic calculation program of the closure and makes the program to meet different conditions ( such as considering flood , the variation of time interval , multi - entrance , multi - reservoir capacity ) , and after comparing and analyzing a great deal of schemes , the reasonable computation scheme was brought up ; the interface of the program was carried out by the programming language vb to make the process of calculation become easier and more distinct , so the result can be analyzed and handled more directly ; vb is used in the later management of the result to plot the graphic chart of the isoline of the maximum of hydraulic element ( the velocity of flow , the drop height and the rate of flow ) automatically ; finally it was applied in the reclamation project of dongbidao of fuqing 本文首先介绍围海工程的发展进程与国内外围海的开发现状，重点介绍了我国目前围海工程的特点及在围海工程实践中积累的经验和理论；利用fortran语言完善堵口工程龙口水力计算程序，使程序可以满足围海工程复杂工况下(如考虑内港洪水、计算时段的变化、多口门、多库容、多水闸)的龙口水力计算，并进行大量方案的比较和分析，提出合理计算方案；利用面向对象的可视化编程语言vb进行界面开发，使计算过程有良好的人机界面，更直观地对计算结果进行分析和处理；计算结果的后处理采用vb编程实现龙口水力要素最大值等值线图的绘制；并运用所编软件对福建省福清市东壁岛围垦工程进行龙口水力计算，为堵口合龙提供科学依据。
Qualitative analysis on the effect of flood control and engineering safety - , seizing lots of water conservancy effective adjust storage . then making water level risen and reservoir backwater enlarged in the same flow level ? effect on beach and the buildings across river , soil salinization caused by flow from a lower to a higher place and unsmooth groundwater drainage destroy of travel resource caused by disorder enclose tideland for cultivation in reservoir silt up flood plain are given , then presents enclose tideland for cultivation dyke is important cause which water level rise in reservoir 本文从青铜峡水库泥沙淤积入手，分析水库泥沙淤积特性和库区围垦堤开发利用淤积滩地的现状，对防洪安全及工程安全的影响、侵占大量的有效调蓄库容、造成同级流量下水库水位抬升水库回水上延、对沿岸及过河建筑构成影响、因水位抬升致使库区周边灌区地下水排水不畅乃至倒灌而造成土地盐碱化、对水库库区大量淤积滩地无序围垦造成旅游资源破坏等五方面影响的定性分析，提出库区围垦堤是水库水位抬升的重要原因。
( 2 ) the water level ascending value effected by enclose tideland for cultivation dyke is reverse proportion to flows below 2000m ' / s , water level has surpassed the top of dam when flow is above 2000m3 / s , water level ascending value is declassing in the same flow level caused by enclose tideland for cultivation dyke ( 2 ) 2000m ~ 3 s以时，围垦堤影响的水库水位抬高水位值随流量增大而增大差逐渐减少，在2000m ~ 3 s以上时，水位已经超过围垦堤堤顶，围垦堤所引起的同级流量下水位抬高值逐渐减少。
Cultivated area ( area under cultivation ) ： refers to farmland which is plowed constantly for growing crops , including cultivated land , newly cultivated land in the current year , farmland left without cultivation for less th an three years and fallow land in the current year , rotation land , rotation land of grass and crops , farmland with some fruit trees , mulberry trees and other trees and cultivated seashore land , lake land , and etc 耕地面积：指年初可以用来种植农作物、经常进行耕锄的田地，除包括熟地、当年新开荒地、连续撂荒未满三年的耕地和当年的休闲地（轮歇地）外，还包括以种植农作物为主并附带种植桑树、茶树、果树和其他林木的土地，以及沿海、沿湖地区已围垦利用的“海涂” 、 “湖田”等面积。
