Evaluation on the cultivated land vulnerability of Shandong coastal areas under the flooding influence of 100-year tide level

the cultivated land area of the seven cities along the coast of Shandong accountes for 37.91% of the total cultivated land in the province.The agricultural output value accountes for 41.12% of the province.Because of the frequent storm surge, the agricultural loss was huge.The altitude of coastal cultivated land area is relatively low.When the tidal water easily run into the cultivate, the crop loss rate ofen is 100% in the current season.At the same time, tidal water changes the soil properties and affects the crop growth of the next season.The anti-tidal standard of the dyke and the compliance rate are low, they cannot against the 100-year storm surge.Therefore, it is conducive to mitigate disaster that we evaluate the vulnerability of cultivated land in the coastal areas of Shandong province.Apply landsat ETM, digital elevation model, surface coverage data and GIS system, this paper evaluated the vulnerability of cultivated land affected by 100-year tide in the coastal area of Shandong province.The vulnerability is divided into seven levels.Research result is as follows:The extremely high vulnerable are Kenli county and Dongying district; the very high vulnerable are Hekou district, Changyi county, Guangrao county and Hanting district; the high vulnerable areas are Chengyang district, Laoshan district and Shouguang city; The medium vulnerable are Laizhou city, Pingdu city, Kenli county and Dongying district; the low vulnerable are Lanshan district, Mugping city, Wendeng city, Rongcheng city, Jimo city, Jiaozhou city, Wudi county, Donggang district, Longkou city, Haiyang city, Hekou district, Zhanhua county and Huangdao district; the very low vulnerable are Penglai city, Huancui district, Lijin county, Zhifu district, Laoshan district, Rushan city and Chengyang district; the extremely low vulnerable are Fushan district, Laishan district and Zhaoyuan city.The vulnerable is caused by the 100-year tide level and the large ratio of inundated cultivated land in Kenli county, Dongying district, Hanting district, Guangrao county, Changyi county and Shouguang.The vulnerable is caused by the large ratio of inundated cultivated land in the Hekou district.