上海国土资源
上海國土資源
상해국토자원
SHANGHAI LAND&RESOURCES
2014年
2期
49-53
,共5页
葛振鹏%戴志军%谢华亮%魏稳%林益帆%高近娟
葛振鵬%戴誌軍%謝華亮%魏穩%林益帆%高近娟
갈진붕%대지군%사화량%위은%림익범%고근연
海湾岸线%Landsat影像%分形方法%冲淤演变%北部湾
海灣岸線%Landsat影像%分形方法%遲淤縯變%北部灣
해만안선%Landsat영상%분형방법%충어연변%북부만
shoreline of the bay%Landsat images%fractal analysis%erosion and deposition%Beibu Gulf
人类活动对我国海湾生态环境的影响日趋严重,作为海湾变化的重要表征-海湾岸线自然成为陆海相互作用研究的主要内容之一。本文以西部大开发的前沿-北部湾海湾岸线为对象,利用Landsat系列影像反演1991、2005及2010年北部湾1595km的大陆岸线;选择1991~2010年间北部湾北部变化强烈的40个岸段,分析岸线的冲淤变化。结果表明:北部湾海湾曲折岸线的固有属性已发生改变,岸线平直化趋势明显;海湾岸线冲淤交互存在,相对遮蔽的岸段岸线积极向海推进,年淤积速率为23m/a,无防护地带的岸线以侵蚀为主,年平均侵蚀速率为24m/a;在不同类型的海湾岸线中,生物海岸与砂质海岸表现为向陆蚀退,年平均侵蚀14m/a,淤泥质海岸为向海淤积,年平均淤积速率为9m/a,基岩海湾岸线变化不大。
人類活動對我國海灣生態環境的影響日趨嚴重,作為海灣變化的重要錶徵-海灣岸線自然成為陸海相互作用研究的主要內容之一。本文以西部大開髮的前沿-北部灣海灣岸線為對象,利用Landsat繫列影像反縯1991、2005及2010年北部灣1595km的大陸岸線;選擇1991~2010年間北部灣北部變化彊烈的40箇岸段,分析岸線的遲淤變化。結果錶明:北部灣海灣麯摺岸線的固有屬性已髮生改變,岸線平直化趨勢明顯;海灣岸線遲淤交互存在,相對遮蔽的岸段岸線積極嚮海推進,年淤積速率為23m/a,無防護地帶的岸線以侵蝕為主,年平均侵蝕速率為24m/a;在不同類型的海灣岸線中,生物海岸與砂質海岸錶現為嚮陸蝕退,年平均侵蝕14m/a,淤泥質海岸為嚮海淤積,年平均淤積速率為9m/a,基巖海灣岸線變化不大。
인류활동대아국해만생태배경적영향일추엄중,작위해만변화적중요표정-해만안선자연성위륙해상호작용연구적주요내용지일。본문이서부대개발적전연-북부만해만안선위대상,이용Landsat계렬영상반연1991、2005급2010년북부만1595km적대륙안선;선택1991~2010년간북부만북부변화강렬적40개안단,분석안선적충어변화。결과표명:북부만해만곡절안선적고유속성이발생개변,안선평직화추세명현;해만안선충어교호존재,상대차폐적안단안선적겁향해추진,년어적속솔위23m/a,무방호지대적안선이침식위주,년평균침식속솔위24m/a;재불동류형적해만안선중,생물해안여사질해안표현위향륙식퇴,년평균침식14m/a,어니질해안위향해어적,년평균어적속솔위9m/a,기암해만안선변화불대。
Anthropogenic activities have affected the ecosystem and environment of the Chinese gulf. The shoreline provides an important reflection of geo-environmental changes in the gulf, and therefore land-ocean interaction in the coastal zone is a focus of research attention. In the present study, the characteristics of the shoreline along the Beibu Gulf in 1991, 2005, and 2010 were examined by extracting and analyzing Landsat data using remote sensing and geographical information system tools. A total of 40 shoreline segments of the studied area were selected to analyze the state of erosion and accretion of the shoreline. The analysis yielded the fol owing conclusions. (1) There is an obvious straightening trend of the Beibu gulf shoreline over time, with the fractal dimension having decreased from 1.3375 in 1991 to 1.2615 in 2010. This trend may be a result of anthropogenic activities. (2) Deposition and erosion co-occurred during changes in the shoreline, whereby the accreting shoreline segments were located mainly in zone protected from the open ocean with a mean rate of accretion of 23 m/yr, and the eroding shoreline segments were located mainly in the zone exposed to the open ocean with a mean rate of erosion of 24 m/yr. (3) Among the different types of shoreline, the biological coast and sandy coast both retreated landward at a rate of 14 m/year. In contrast, the silt coast prograded at a rate of 9 m/yr, whereas the position of the rocky coast remained static.