摘要
利用海图和遥感影像资料,确定了不同时期黄河三角洲的造陆速率,并将造陆速率的变化与流域降水和人类活动的变化相联系.研究发现,三角洲造陆速率与年降水量之间具有正相关关系,与各项水土保持面积和人类引水量之间具有负相关关系.运用多元回归分析方法,建立了黄河三角洲造陆速率与年降水量、梯田林草面积、淤地坝造地面积、人类年引水量等因子之间的多元回归方程.该方程表明,年降水量越大,三角洲造陆速率越大;梯田、林草面积和淤地坝造地面积越大,三角洲造陆速率越小;人类净引水量越大,三角洲造陆速率越小.
Because tidal and wave processes in the Huanghe River mouth are weak but the sediment flux from the river into the sea is huge in quantity, land-accreting process of the Huanghe River Delta is predominated by drainage basin factors. Thus, the Huanghe River Delta provides an ideal site to study the response of land-accreting process to the changing climate and human activities. By using sea charts and remote sensing images, the annual land accreting area is identified and then related with annual precipitation and human activities in the drainage basin. It is found that the land-accreting rate of the delta is positively correlated with precipitation, but negatively correlated with the areas of all kinds of erosion control measures and with the quantity of water diversion. A multiple regression equation is established between the land-accreting rate of the delta and the influencing factors including the area of terrace land-building and tree- and grass-planting, the area of the land created by the sediment trapped by checkdams, the annual precipitation and the annual quantity of water diversion. The equation indicates that the land-accreting rate of the delta increases with annual precipitation, but decreases with the areas of land-terracing, tree-and grass-planting and the land created by the sediment-trapping checkdams, and decreases with the quantity of net water diversion.
出处
《海洋学报》
CAS
CSCD
北大核心
2004年第3期68-74,共7页
基金
中国科学院知识创新工程重要方向资助项目(KZCX2-20705)
国家重点基础研究发展规划资助项目(G1999043604).
关键词
三角洲
三角洲造陆
陆海相互作用
人类活动
黄河
delta
land-accreting of delta
land-ocean interaction
human activity
Huanghe River
