scholarly journals Wetland Landscape Pattern Evolution and Prediction in the Yellow River Delta

2021 ◽  
Author(s):  
Ke ZHOU
Keyword(s):  
Constructed Wetland ◽  
Landscape Pattern ◽  
Yellow River ◽  
Model Simulation ◽  
Yellow River Delta ◽  
River Delta ◽  
The Yellow River ◽  
Natural Wetland ◽  
Wetland Area ◽  
The Yellow River Delta

Abstract Starting from the overall pattern of wetland evolution in the Yellow River Delta, The combination of CA-Markov model and MLP model is studied. Based on the low-medium resolution Landsat data and the field survey data, the evolution trend of wetland landscape pattern in the Yellow River Delta is simulated and predicted by using the proposed models. Taking high resolution (2m) data in 2016 as the precision verification, the model simulation results are validated. The results show that the area of natural wetlands in the Delta was decreased from 2593.63 km2 in 1976 to 1639.60 km2 in 2016, a total area of 954.03 km2 was reduced. According to the model simulation, the natural wetland area in 2026 is predicted to be 1252.7 km2, the constructed wetland area will be 1265.0 km2, the non-wetland area will be 924.5 km2. The constructed wetland in the Yellow River Delta is increasing and spreading into the sea, but the area of natural wetland has been decreasing. If this trend be developed, the national natural wetland conservation target would not be realized. The results are of great significance to the wetland development planning, management and protection in the Yellow River Delta.

Relationship between coastline changes and the landscape pattern heterogeneity of the salt marshes in the Yellow River Delta, China

2016 ◽  
Vol 36 (2) ◽  
Author(s):  
孙万龙 SUN Wanlong ◽  
孙志高 SUN Zhigao ◽  
卢晓宁 LU Xiaoning ◽  
王苗苗 WANG Miaomiao ◽  
王伟 WANG Wei
Keyword(s):  
Landscape Pattern ◽  
Salt Marshes ◽  
Yellow River ◽  
Yellow River Delta ◽  
River Delta ◽  
The Yellow River ◽  
The Yellow River Delta

Influence of hydrology process on wetland landscape pattern: A case study in the Yellow River Delta

2009 ◽  
Vol 35 (12) ◽  
pp. 1719-1726 ◽  
Author(s):  
Sheng-nan Li ◽  
Gen-xu Wang ◽  
Wei Deng ◽  
Yuan-man Hu ◽  
Wei-Wei Hu
Keyword(s):  
Landscape Pattern ◽  
Yellow River ◽  
Yellow River Delta ◽  
River Delta ◽  
The Yellow River ◽  
The Yellow River Delta ◽  
Wetland Landscape

Effects of reclamation on net ecosystem CO2 exchange in wetland in the Yellow River Delta, China

2013 ◽  
Vol 37 (6) ◽  
pp. 503-516 ◽  
Author(s):  
Li-Qiong YANG ◽  
Guang-Xuan HAN ◽  
Jun-Bao YU ◽  
Li-Xin WU ◽  
Min ZHU ◽  
...  
Keyword(s):  
Yellow River ◽  
Yellow River Delta ◽  
Co2 Exchange ◽  
River Delta ◽  
The Yellow River ◽  
Net Ecosystem Co2 Exchange ◽  
The Yellow River Delta

scholarly journals Impacts of Consolidation Time on the Critical Hydraulic Gradient of Newly Deposited Silty Seabed in the Yellow River Delta

2021 ◽  
Vol 9 (3) ◽  
pp. 270
Author(s):  
Meiyun Tang ◽  
Yonggang Jia ◽  
Shaotong Zhang ◽  
Chenxi Wang ◽  
Hanlu Liu
Keyword(s):  
Yellow River ◽  
Yellow River Delta ◽  
Hydraulic Gradient ◽  
River Delta ◽  
Theoretical Formula ◽  
The Yellow River ◽  
The Yellow River Delta ◽  
Critical Hydraulic Gradient ◽  
Seepage Flows ◽  
The Yrd

The silty seabed in the Yellow River Delta (YRD) is exposed to deposition, liquefaction, and reconsolidation repeatedly, during which seepage flows are crucial to the seabed strength. In extreme cases, seepage flows could cause seepage failure (SF) in the seabed, endangering the offshore structures. A critical condition exists for the occurrence of SF, i.e., the critical hydraulic gradient (icr). Compared with cohesionless sands, the icr of cohesive sediments is more complex, and no universal evaluation theory is available yet. The present work first improved a self-designed annular flume to avoid SF along the sidewall, then simulated the SF process of the seabed with different consolidation times in order to explore the icr of newly deposited silty seabed in the YRD. It is found that the theoretical formula for icr of cohesionless soil grossly underestimated the icr of cohesive soil. The icr range of silty seabed in the YRD was 8–16, which was significantly affected by the cohesion and was inversely proportional to the seabed fluidization degree. SF could “pump” the sediments vertically from the interior of the seabed with a contribution to sediment resuspension of up to 93.2–96.8%. The higher the consolidation degree, the smaller the contribution will be.

scholarly journals Nitrate leaching and NH3 volatilization during soil reclamation in the Yellow River Delta, China

2021 ◽  
pp. 117330
Author(s):  
Wei Zhu ◽  
Jingsong Yang ◽  
Rongjiang Yao ◽  
Xiangping Wang ◽  
Wenping Xie ◽  
...  
Keyword(s):  
Nitrate Leaching ◽  
Yellow River ◽  
Yellow River Delta ◽  
River Delta ◽  
Soil Reclamation ◽  
The Yellow River ◽  
Nh3 Volatilization ◽  
The Yellow River Delta
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