杭州灣金山深槽沖淤演變及其趨勢(shì)預(yù)測(cè)
發(fā)布時(shí)間：2019-02-16 00:01
【摘要】：潮流沖刷槽是河口海岸地區(qū)重要的地貌單元,其演變動(dòng)態(tài)直接影響周邊涉海工程的安全�；�1972-2011年間共16期水深地形圖,建立統(tǒng)一的數(shù)字高程模型(DEM),采用經(jīng)驗(yàn)正交函數(shù)方法 (EOF),分析了金山深槽總體的演變特征。EOF分析得到的前3個(gè)特征函數(shù)反映的沖淤變化區(qū)主要位于水深15 m(吳淞基面)以下的深槽區(qū)域,演變特征以深槽的南北拓寬及向西延伸為主;典型斷面代表的中部深槽、局部深潭以及深槽延伸前緣呈現(xiàn)不同的時(shí)空演變特征。采用EOF結(jié)合三次樣條平滑方法,對(duì)金山深槽區(qū)域的演變趨勢(shì)進(jìn)行預(yù)測(cè),認(rèn)為預(yù)測(cè)的2020年地形特征與2011年相比,將會(huì)延續(xù)之前的演變趨勢(shì):中部深槽區(qū)域拓寬、西部深潭沖淤交替以及深槽前緣繼續(xù)向西延伸。
[Abstract]:Tidal current scour trough is an important geomorphologic unit in estuarine and coastal area. Based on 16 topographic maps of water depth from 1972 to 2011, a unified digital elevation model (DEM),) was established using empirical orthogonal function method (EOF),). The evolution characteristics of Jinshan deep trough are analyzed. The scour and silt change area reflected by the first three characteristic functions obtained by EOF analysis is mainly located in the deep trough area below the water depth of 15 m (Wusong base surface). The main evolution features are the widening of the deep trough from the north to the south and the extension to the west; The central deep trough, local deep pool and the leading edge of deep trough extension show different temporal and spatial evolution characteristics. By using EOF and cubic spline smoothing method, the evolution trend of Jinshan deep trough area is predicted. Compared with 2011, the topographic features predicted in 2020 will continue the evolution trend: widening deep trough area in the middle part of China. West deep pool scour silt alternately and deep trough front edge continues to extend westward.
【作者單位】： 華東師范大學(xué)河口海岸學(xué)國家重點(diǎn)實(shí)驗(yàn)室;國家海洋局第二海洋研究所國家海島開發(fā)與管理研究中心;
【基金】：國家自然科學(xué)基金(41576095;41376068) 河口海岸學(xué)國家重點(diǎn)實(shí)驗(yàn)室開放基金(SKLEC-KF201503)
【分類號(hào)】：P737.1
本文編號(hào)：2423828
[Abstract]:Tidal current scour trough is an important geomorphologic unit in estuarine and coastal area. Based on 16 topographic maps of water depth from 1972 to 2011, a unified digital elevation model (DEM),) was established using empirical orthogonal function method (EOF),). The evolution characteristics of Jinshan deep trough are analyzed. The scour and silt change area reflected by the first three characteristic functions obtained by EOF analysis is mainly located in the deep trough area below the water depth of 15 m (Wusong base surface). The main evolution features are the widening of the deep trough from the north to the south and the extension to the west; The central deep trough, local deep pool and the leading edge of deep trough extension show different temporal and spatial evolution characteristics. By using EOF and cubic spline smoothing method, the evolution trend of Jinshan deep trough area is predicted. Compared with 2011, the topographic features predicted in 2020 will continue the evolution trend: widening deep trough area in the middle part of China. West deep pool scour silt alternately and deep trough front edge continues to extend westward.
【作者單位】： 華東師范大學(xué)河口海岸學(xué)國家重點(diǎn)實(shí)驗(yàn)室;國家海洋局第二海洋研究所國家海島開發(fā)與管理研究中心;
【基金】：國家自然科學(xué)基金(41576095;41376068) 河口海岸學(xué)國家重點(diǎn)實(shí)驗(yàn)室開放基金(SKLEC-KF201503)
【分類號(hào)】：P737.1
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