Dynamics of coastline changes in Mexico  

墨西哥海岸线演变（英文）

作　　者：VALDERRAMA-LANDEROS Luis H. MARTELL-DUBOIS Raúl RESSL Rainer SILVA-CASARíN Rodolfo CRUZ-RAMíREZ Cesia J. MUNOZ-PEREZ Juan J. 

机构地区：[1]National Commission for the Knowledge and Use of Biodiversity,Liga Periferico-Insurgentes Sur 4903, Col. Parques del Pedregal, Del. Tlalpan, Ciudad de Mexico. C.P. 14010, Mexico [2]Instituto de Ingeniería, UNAM, Circuito Escolar s/n, Ciudad Universitaria,Delegacion Coyoacan, Ciudad de Mexico, C.P. 04510, Mexico [3]Physical Oceanography, Cadiz University, Dpto.de Física Aplicada, CASEM,11150, Puerto Real (Cadiz), Spain

出　　处：《Journal of Geographical Sciences》2019年第10期1637-1654,共18页地理学报（英文版）

摘　　要：The goal of our work was to locate and quantify changes that occurred in 66% of the Mexican coastline, based on four land cover maps generated by the Mexican Mangrove Monitoring System(SMMM) of the National Commission for the Knowledge and Use of Biodiversity(CONABIO) for the years 1970/81, 2005, 2010, and 2015. Our results showed overall dominance of erosion over accretion processes, beaches being the most affected coastal land cover. Emphasis was placed on identification and description of coastline sites in which land was either continuously lost(erosion) or gained(accretion) during the studied time periods. These sites were defined as continuous unidirectional dynamic sites and were compared with previous knowledge about the geodynamics of Mexican coasts. Continuous unidirectional dynamic sites were distributed throughout the study area and within all land cover types, but predominantly corresponded to areas covered by mangroves in the states of Campeche and Nayarit. Finally, we found an intensification of coastal erosion-accretion processes over time;coastline change rates having duplicated between the earliest(1970/81–2005) and the two more recent(2005–2010, and 2010–2015) analysed time periods, with erosion rates for each corresponding period of –3 m/yr,–7.5 m/yr, and –7.3 m/yr,and accretion rates of 2.8 m/yr, 7.3 m/yr, and 6.9 m/yr, respectively.The goal of our work was to locate and quantify changes that occurred in 66% of the Mexican coastline, based on four land cover maps generated by the Mexican Mangrove Monitoring System (SMMM) of the National Commission for the Knowledge and Use of Biodiversity (CONABIO) for the years 1970/81, 2005, 2010, and 2015. Our results showed overall dominance of erosion over accretion processes, beaches being the most affected coastal land cover. Emphasis was placed on identification and description of coastline sites in which land was either continuously lost (erosion) or gained (accretion) during the studied time periods. These sites were defined as continuous unidirectional dynamic sites and were compared with previous knowledge about the geodynamics of Mexican coasts. Continuous unidirectional dynamic sites were distributed throughout the study area and within all land cover types, but predominantly corresponded to areas covered by mangroves in the states of Campeche and Nayarit. Finally, we found an intensification of coastal erosion-accretion processes over time; coastline change rates having duplicated between the earliest (1970/81-2005) and the two more recent (2005-2010, and 2010-2015) analysed time periods, with erosion rates for each corresponding period of -3 m/yr, -7.5 m/yr, and -7.3 m/yr, and accretion rates of 2.8 m/yr, 7.3 m/yr, and 6.9 m/yr, respectively.

关 键 词：CHANGES in MEXICAN COASTLINE Mexico COAST EROSION COAST ACCRETION 

分 类 号：P737[天文地球—海洋地质]