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Tidal pool near the inlet of Yantai, Shandong

Sponsored by

China, Shandong, Yantai

Found at the western end of Yangma Island, this place is very close to the entrance of the Xin’an River, so the salinity here is very low.

On the strata, Yangma Island is a metamorphic rock island dominated by marble. Along the coast of Yangma Island, there are Cenozoic Quaternary strata, alluvial ~ marine deposits. Its thickness varies from place to place, generally it is about 25 meters. Its lithology is from top to bottom: first, gravel; sand, mainly quartz; feldspar; light yellow and black minerals, with different particle size and good grinding roundness; gravel, mainly gneiss with a diameter of 1~10 cm, good grinding roundness and thickness of 11 meters. Second, muddy clay sand, grayish brown and gray-black, containing more fine silt and humus, poor viscoplasticity.

This part of the rock is characterized by the development of complex carbonate rocks with a large amount of graphite and metasomatic iron ore.

Submitted by
Zhang Lixian
Approved by
Fan Li & Zhou Hang
GPS
37.4487762, 121.5794907
Geographical region
Eastern Asia
Drainage Basin
River catchment
Water body type
River
Water body name
Xin'an River
Water body part
Marsh land
Water body course
Lower course
Water body: tributary of
Wetland
Tributary name

Videos above and below water

Water Chemistry

Water information

Water type
Brackish water
Water color
Clear water
Water transparency
High
Concentration of sediments
Low
Water temperature
20 °C
Water flow/curent
Slow

Chemical parameters

pH
7.35
Conductivity
GH
0
KH
Dissolved Oxygen

Substrate in nature

Sand
Grey
Pebble/Gravel
Beige
Stone
Brown
Stone form
Irregular
Silt/Mud
Grey
Leaves
Few
Driftwood
Few
Submerged terrestrial vegetation
Yes

Aquatic Biotope

Date of collecting
28/08/2020
Collecting area
Small bay
Water depth
1,0m
Air temperature
31 °C
Sunlight
Full sun

Environment

Environment
Affected by human activity
Affected by human activity
Pollution
Pollution
Little
Surrounding area

Yangma Island is located in Rushan ~ Weihai Fu anticline west wing, anticline axis from Rushan Taiyi north east through the main peak of Kunju Mountain, Wendeng Wang Tuan, Weihai Huancui District Yangting, in Huancui District Tian Village, axial north east.

The first rock section of the second rock group of the Jiaodong rock group forms the core part and the second rock section forms two wings. Due to the influence of many magmatic activities, the fold morphology is seriously destroyed. Yangma Island-Kongtong Island fault zone is a north-west tension fault, distributed in Muping Outer Sea, similar to the Penglai-Weihai fault zone also through Muping Outer Sea. Its fracture scale is large, about 100 km long ,5~50 meters wide.

Underwater landscape

The bedrock exposed along the coast of Yangma Island is mostly metamorphic rock in the middle and deep region of the Lower Proterozoic. Its lithology is mainly mixed granite. The formation is the second rock section of Jiaodong Group in Lower Proterozoic. The lithology is mainly gneiss, granulite and amphibolite. In some headland areas, metamorphic granites with strong erosion resistance are also exposed. There are obvious differences between the headland area and the top of the beach.

Fish: Palaemon pacificus.

Plants: Caulerpa lentillifera.

 

Threats to ecology

Sea water quality in Yangma Island, 1990: pH between 7.2~8.2, Nitrite nitrogen, cyanide, arsenic, iron, chromium, Nitrite nitrogen was measured at 0.018% in September, between 7.1~7.84. Meets fishery water standards. Oxygen consumption. Yangma Island Houhai and Qianhai in May to meet the requirements. The value was slightly higher in September, between 0.02~0.24. Basically meets the standard. Volatile phenol content, before and after the island is zero. Imitation salinity recently measured 19 ppt, water temperature 10°C to 30°C, floating. I got Tridentiger trigonocephalus, Tridentiger bifasciatus, Omobranchus elegans, Ernogrammus hexagrammus, Dictyosoma burgeri, Periophthalmus modestus, Palaemon pacificus, Pagurus lanuginosus, Lunella correensis, Planaxis sulcatus, Cellana toreuma, Mytilus edulis, Ulva pertusa, Caulerpa lentillifera, Sargassum sp. and some rocks and sand here. For the construction of this cylinder.

Riparian zone

Trees near the aquatic habitat
Few -