珠江三角洲网河区水位变化趋势研究
The secular trend of water level changes in the network channels of the Zhujiang River Delta
-
摘要: 根据珠江三角洲网河区29个验潮站的实测验潮记录,应用傅氏变换与最平滤波器串联的方法来消除月均序列的周期波动对确定水位变化趋势的影响,由低通序列一元线性回归分析确定各站水位的变化趋势;结果表明,周期波动对确定海平面变化趋势的影响是显著的.应用经验正交函数(EOF)对网河区的水位变化场进行分解,由相互独立的时间函数和空间特征函数表征网河区区域的水位变化特征;应用时间特征函数计算区域水位的平均变化率为0.02mm/a.根据验潮站的水位变化趋势,探讨网河区水位变化与河床冲淤的关系.Abstract: Considering the significant contribution of the periodic components to the secular trends of relative sea level(RSL) change,the Fourier transform and the maximum flat filter were applied to eliminate the effects of periodic components on the determination of the secular trends of RSL change.The secular trend of RSL change was determined by linear regression of low-pass series.The empirical orthogonal function(EOF) was used to analyse the characteristics of RSL change; the average rate of water level change in the Zhujiang River Delta was calculated by the main mode of EOF,which is 0.02 mm/a.According to the secular trends of gauge stations in the networks,the response of water level change to the channel degradation and aggradation was discussed.
-
Key words:
- secular trend /
- periodic components /
- normal equation /
- Fourier transform
-
中国科学院地学部.海平面上升对中国三角洲地区的影响及对策[A].中国科学院院士咨询报告[R],总第一号(地0l号).北京:科学出版社,1994.1~4 曾昭璇,刘南威,胡男,等珠江口水位变化的趋势[J].热带海洋,1992,11(4):56~62 曾昭璇,刘南威,胡男,等.珠江口海平面上升趋势与地壳运动[J].热带地理,1992,12(2):99~107 任美锷.黄河、长江、珠江三角洲近30年海平面上升趋势及2030年上升量预测[J].地理学报,1993,48(5):385~393. 李平日,方国祥,黄光庆.海平面上升对珠江三角洲经济建设的可能影响及对策[J].地理学报,1993,48(6):527~534. 黄镇国,张伟强,赖冠文,等.珠江三角洲海平面上升对堤围防御能力的影响[J] 地理学报,1999,54(6):518~525 陈特固,杨清书近几十年来珠江口海平面变化趋势的研究[A].中国科学院院士咨询报告[R],总第一号(地01号)北京:科学出版社,1994.53~62, 杨清书,罗宪林珠江口伶仃洋海平面变化趋势研究[J].地理科学,1999,19(2):125~127. 杨清书,吴超羽,倪培桐.傅氏变换在短序列确定海平面变化趋势中的应用[J].热带地理,1996,16(2):107~113 BARNETT T P.Recent changes in global sea level and their possible causes [J].Climate Change,1983,5(1):15~38. BARNETT T P.The estimation of "global" sea level change:A problem of uniqueness [J].Journal of Geophysical Research,1984,89(c5):7 980~7 988. 杨清书,杨干然,方畴军.最平滤波器在分析月平均潮位资料中的应用[J].热带海洋,1996,5(1):39~43
计量
- 文章访问数: 868
- HTML全文浏览量: 18
- PDF下载量: 718
- 被引次数: 0