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Posts tagged Bohai Gulf

Changes in the Coastline of the Bohai Gulf, China – April 29th, 2013

38.8N 119.7E

April 29th, 2013 Category: Image of the day, Sediments

China – April 29th, 2013

The evolution of a coastline reflects the influence of geology, rivers, climate, tides and sea level changes. Bohai Gulf, visible here with a strong presence of sediments, is the core region of the China Bohai Bay economic circle, so the research of coastline changes and the driving forces is of great importance for socio-economic sustainable development and regional environmental protection.

By analyzing spatial and temporal coastline changes and the driving forces behind them, scientists have shown a dramatic increase in the proportion of artificial coastlines over the past thirty years, as well as increases in coastline length.

As a result of coastline changes, land area increased by 760 square kilometers during 1979-1989, 424 square kilometers during 1989-2000 and 608 square kilometers during 2000-2010. Due to coastal erosion, however, there were 66.2, 77.5 and 28.3 square kilometers of land lost during the years of 1979-1989, 1989-2000 and 2000-2010 respectively.

Scientists have also observed that the driving forces for coastline changes have significant temporal heterogeneity: in the period of 1980 to 1990, the main driving force for coastline change was estuary sedimentation, especially in the Yellow River estuary, while the main driving force was tidal flat reclamation for aquaculture during 1990 to 2000, and the driving force for coastline change in the last decades has been the interaction of aquaculture and port construction (click here for more information).

Thick Fog and Haze Shrouding Central and Northern China

38.0N 114.4E

January 16th, 2013 Category: Clouds

China – January 6th, 2013

Thick fog and haze shrouded central and northern parts of China in early January. Hebei and Henan provinces (visible here west and southwest of the Bohai Gulf, respectively) were listed among the most polluted areas, monitoring data showed. An air quality report from the Ministry of Environmental Protection ranked Handan, Baoding and Shijiazhuang in Hebei and Zhengzhou in Henan as the top four most-polluted cities among 120 monitored nationwide.

Around the time this image was captured, the Air Pollution Index in the four cities reached 500, the maximum on the index. An API reading below 50 indicates excellent air quality, 50 to 100 indicates healthy air, and readings above 100 mean polluted air. Experts and residents in the worst-hit areas are becoming increasingly worried about the air pollution brought by frequent winter haze. Greenpeace warned that wsall particles in the air can cause heart disease, stroke, respiratory illness, birth defects and cancer.

Silt in Bohai Bay, China

38.5N 118.1E

October 11th, 2012 Category: Sediments

China – October 10th, 2012

Sediments line the shores of Bohai Bay, particularly to the south, one of the three bays forming the Bohai Gulf, the innermost gulf of the Yellow Sea, in northeast China.┬áThe Bohai Bay receives the drainage of the Haihe and 15 other rivers. Due to these rivers’ muddy runoff, the bay used to be a highly silty water body, but extensive damming of the various river systems has greatly diminish siltage. Nevertheless, the Bohai Bay in effect concentrates the runoff of the whole eastern North China Plain, and the Bay is an intensely polluted body of water.

Various Colors of Sediments in Bohai Gulf, China

38.8N 119.7E

August 27th, 2012 Category: Sediments

China – August 23rd, 2012

Thick sediments can be observed along the southwestern and northeastern shores of the Bohai Sea, the innermost gulf of the Yellow Sea on the coast of Northeastern and North China. The Bohai Sea is bounded by the Liaodong (above) and Shandong Peninsulas (below). There are three major bays inside the Bohai Sea: Laizhou Bay to the south, Liaodong Bay to the north, and Bohai Bay to the west. Here, the sediments along the shores of Bohai and Laizhou Bays are golden tan in color, while those in the Liaodong Bay are more reddish-tan.

Haze Over North China Plain by Bohai Sea

37.6N 117.0E

December 19th, 2011 Category: Clouds, Mountains, Sediments

China - December 18th, 2011

A thick fog or haze hangs over the North China Plain and in the valleys of the mountains and hills bordering it. The largest alluvial plain of eastern Asia, it is bordered on the north by the Yanshan Mountains and on the west by the Taihang Mountains at the edge of the Shanxi (‘western mountains’) plateau. To the south, it merges into the Yangtze Plain.

From northeast to southeast, it fronts the Bohai Gulf, the highlands of Shandong Peninsula, and the Yellow Sea. The Yellow River flows through the middle of the plain into Bohai Gulf. Here, both the gulf and sediments from the river are partially visible through the haze.