對(duì)威尼斯古城中心所做的高分辨率衛(wèi)星監(jiān)測(cè),，為自然沉降和人類活動(dòng)對(duì)該城市過(guò)去20年的土地運(yùn)動(dòng)的相對(duì)貢獻(xiàn)做出了估計(jì),。這些發(fā)現(xiàn)發(fā)表在本期Scientific Reports上。
Luigi Tosi,、Pietro Teatini和Tazio Strozzi設(shè)計(jì)了一項(xiàng)研究,，來(lái)區(qū)分威尼斯的自然土地沉降與人類活動(dòng)誘導(dǎo)的土地運(yùn)動(dòng),。抽地下水所產(chǎn)生的影響（這種影響歷史上對(duì)土地沉降有貢獻(xiàn)）幾十年前停止了,。然而，由于最近發(fā)生的海平面變化（這種變化增加了該城市的脆弱性）,，關(guān)于影響威尼斯市中心的土地沉降的可靠,、詳盡的知識(shí)仍然非常重要。作者利用兩種不同類型的高分辨率衛(wèi)星監(jiān)測(cè)（這種監(jiān)測(cè)能顯示各個(gè)建筑物的微小運(yùn)動(dòng)）研究了該市市中心的長(zhǎng)期和短期位移,。
該研究表明,，自然沉降正在以每年大約0.8-1毫米的速度在威尼斯發(fā)生，而人類活動(dòng)目前對(duì)土地運(yùn)動(dòng)的貢獻(xiàn)大約為每年2-10毫米,，但只是在非常局部化的（空間）尺度上和短時(shí)間尺度上產(chǎn)生這種貢獻(xiàn),。作者說(shuō)，人類造成的變化主要是由以保護(hù)歷史建筑為目的的保護(hù)和重建工作,、以及市政工程（包括為穩(wěn)定運(yùn)河壁所做的工作）引起的,。（生物谷Bioon.com）
生物谷推薦的英文摘要
Scientific Reports doi:10.1038/srep02710
Natural versus anthropogenic subsidence of Venice
Luigi Tosi，Pietro Teatini& Tazio Strozzi
We detected land displacements of Venice by Persistent Scatterer Interferometry using ERS and ENVISAT C-band and TerraSAR-X and COSMO-SkyMed X-band acquisitions over the periods 1992–2010 and 2008–2011,， respectively. By reason of the larger observation period,， the C-band sensors was used to quantify the long-term movements， i.e. the subsidence component primarily ascribed to natural processes. The high resolution X-band satellites reveal a high effectiveness to monitor short-time movements as those induced by human activities. Interpolation of the two datasets and removal of the C-band from the X-band map allows discriminating between the natural and anthropogenic components of the subsidence. A certain variability characterizes the natural subsidence (0.9 ± 0.7mm/yr),， mainly because of the heterogeneous nature and age of the lagoon subsoil. The 2008 displacements show that man interventions are responsible for movements ranging from 10 to 2mm/yr. These displacements are generally local and distributed along the margins of the city islands.
