The Binzhou shell dike island and wetland state-level nature protection area - natural environment
the shell dike is lives the shell and the fragment and the granulated sugar, the silt, the peat coal, the silt argillaceous clay pan by the sea is composed, with seacoast approximately parallel or angle of intersection very small dike shape landform stack body. Forms nearby the high-water mark, for ancient seacoast on landform reliable symbol. The silt silt argillaceous coastal zone, under the wave function, fires into after the elutriate biological shell the stack body which the shore forms. The wave washout, causes the beach gradient to increase, the body coarsening, the base shell class shell is rushed to by the sea water the shore, piles up nearby the high-water mark, then forms the shell dike after the long-term function. When the coastal zone silt origin is full, when the beach silt accumulation is exuberant, shell dike stop growth. Multiple flushes the silt change then to leave behind many shell dikes. May take the ancient coastline migration the symbol.
the Binzhou shell dike island and wetland state-level nature protection area
the shell beach ridge seacoast's formation must meet three requirements, namely silt silt marshy bank, relative marine denudation background and rich shell river snail source. In the history, Yellow River by “the friendly silt, friendly, the friendly change residence is famous definitely”, Yellow River carries the massive fine grain loess material, long time, again and again in the Persian Gulf West bank, Nanan migration, in this has molded in the world the scale biggest silt muddy coast. When Yellow River changes course, the river mouth moves elsewhere, along with the entering the sea silt quantity's reduction, the seacoast no longer silts up grows, the sea water changes the limpidity, the great variety the sea mollusk resources could multiply live, have provided the sufficient shell river snail source. Most importantly as a result of the ocean waves tidal motion, corrodes primarily, shell removal to beaching, along with shell yearly aggradation, also has formed the unique shell beach ridge seacoast. Once Yellow River changes course to return to original home or work, the shell dike namely is pale because of the sea water and the opacitas silt marshy bank does not favor the shell to grow terminates. Outside the shell dike, the sedimentation accumulation land, the coastline forward extends, the shell dike is far away from the seacoast, either abandonment on land, either not in underground. Therefore, as a result of Yellow River's migration back and forth, the coastline stops from time to time, the silt and the shell dike change alternately, in the Persian Gulf West bank, the Nanan formed many to be parallel to the coastline shell dike.
in the ancient shell dike the sand bed is loose, is advantageous stores up in the rain water, digs a pit in the ancient shell dike, the sweet water continuously will infiltrate, will wash also washes endlessly. This shell dike not only has blocked the flood tide for the fishing village, moreover is also fisherman's natural navigation aid, in the remote sea, the fisherman saw by far this green dike, was similar to sees the warm homeland.

In the protectorate is distributing two row ancient shell dikes. The first row in the protectorate south tip, long 40KM, the burying depth 0.5-1 meter, the shell level depth 3-5 meters, was in 5000; The second row north the protectorate, long 22KM, is composed of 40 shell islands, the island width 100-500 meters, the shell depth 3-5 meters, are exposed open wide, was 2000-1500 years. In three big ancient shell dikes which in the present world discovered that the non-younger brother shell dike purity is not only highest, the scale to be biggest, also preserves is most complete, and only new old dike coexisting shell dike island. Regardless of being buries deeply underground, exposes in the surface, the conchiolin content achieves 100% nearly, but the American St. Louis Anna continent and the South America Surinam shell dike, the shell content is only about 30%, Tianjin, Hebei have preserved are only several section planes; The non-younger brother shell dike also every year increases above 100,000 tons along with the sea water tidal action, visible becomes the third shell dike island the tendency.
the non-younger brother shell dike has composed the broad in scale the shell beach ridge seacoast, internationally is called the Chenier seacoast. Between two row shell dike island's wetland and under the wetland and the tide the wetland has composed the world rare shell dike island and the wetland system to between the sea tide. The shell dike inside and outside Binhai wetland biodiversity is rich, it is west the Northeast Asia interior and the link the Pacific Ocean birds migration stopover station and survives the winter, perches, the multiplication place, is studies the Yellow River vicissitude, the coastline change, shell dike island environment evolutions as well as the wetland type and so on formation Important base, in the Chinese sea geology, the biodiversity and in the wetland type research work holds the extremely important status.