The Huanghe (Yellow River) and Changjiang (Yangtze River) deltas: a review on their characteristics, evolution and sediment discharge during the Holocene

Saito, Yoshiki; Yang, Zuosheng; Hori, Kazuaki

doi:10.1016/s0169-555x(01)00118-0

Cited by 432 publications

(168 citation statements)

References 22 publications

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“…Meanwhile, the water demand for industry and resident life increased, which accelerated the crisis of the downstream ecological water resources. The annual flow of the Yellow River has decreased dramatically in the past decade, and the flow has a significant negative correlation with the temperature and positive correlation with precipitation [49,[86][87][88][89][90]. Climate change was a long-term critical impact factor on the reduction of flow.…”

Section: Climate Changementioning

confidence: 99%

Four Decades of Estuarine Wetland Changes in the Yellow River Delta Based on Landsat Observations Between 1973 and 2013

Zhu

Zhang

Huang

2018

Water

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Yellow River Delta wetlands are essential for the migration of endangered birds and breeding. The wetlands, however, have been severely damaged during recent decades, partly due to the lack of wetland ecosystem protection by authorities. To have a better historical understanding of the spatio-temporal dynamics of the wetlands, this study aims to map and characterize patterns of the loss and degradation of wetlands in the Yellow River Delta using a time series of remotely sensed images (at nine points in time) based on object-based image analysis and knowledge transfer learning technology. Spatio-temporal analysis was conducted to document the long-term changes taking place in different wetlands over the four decades. The results showed that the Yellow River Delta wetlands have experienced significant changes between 1973 and 2013. The total area of wetlands has been reduced by 683.12 km 2 during the overall period and the trend of loss continues. However, the rates and trends of change for the different types of wetlands were not the same. The natural wetlands showed a statistically significant decrease in area during the overall period (36.04 km 2 ·year −1 ). Meanwhile, the artificial wetlands had the opposite trend and showed a statistically significant increase in area during the past four decades (18.96 km 2 ·year −1 ). According to the change characteristics revealed by the time series wetland classification maps, the evolution process of the Yellow River Delta wetlands could be divided into three stages: (1) From 1973From -1984, basically stable, but with little increase; (2) from 1984-1995, rapid loss; and (3) from 1995-2013, slow loss. The area of the wetlands reached a low point around 1995, and then with a little improvement, the regional wetlands entered a slow loss stage. It is believed that interference by human activities (e.g., urban construction, cropland creation, and oil exploitation) was the main reason for wetland degradation in the Yellow River Delta over the past four decades. Climate change also has long-term impacts on regional wetlands. In addition, due to the special geographical environment, the hydrological and sediment conditions and the location of the Yellow River mouth also have a significant influence on the evolution process of the wetlands.

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Section: Climate Changementioning

confidence: 99%

Four Decades of Estuarine Wetland Changes in the Yellow River Delta Based on Landsat Observations Between 1973 and 2013

Zhu

Zhang

Huang

2018

Water

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“…The non-clay minerals were quartz, plagioclase, orthoclase, mica, amphibole, calcite, etc. (Saito et al 2001;Han et al 1996).…”

Section: Study Area Descriptionmentioning

confidence: 99%

Geochemical and isotopic evidence of shallow groundwater salinization in a reclaimed coastal zone: the Yellow River Delta, China

Liu

et al. 2016

Environ Earth Sci

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This paper aims to improve the current knowledge of groundwater salinization processes of a young coastal aquifer in the Yellow River Delta (YRD) and to assess the impact of both the transfer of irrigation water from the Yellow River and seawater intrusion, using a combination of hydrochemical-isotopic measurements. The major ion/Cl -ratios generally closely follow the mixing line between freshwater end-member (the Yellow River) and saline water end-members (salt groundwater or seawater), indicating the importance of mixing under natural and anthropogenic influences. The examination of stable isotope in groundwater (ranging from -9.0 to -3.5 % for d18 O and from -73 to -29 % for dD, respectively) and chloride concentrations (*2 to 629 meq/ L) confirms that the saline end-member is associated with saltwater rather than present seawater, and most groundwater samples are plotted on mixing lines between the Yellow River and saltwater. The similar range in stable isotopes (d 18 O and dD) and Cl -compositions between saltwater and confined aquifer supports the hypothesis that upward seepage of confined saline water intruded the shallow aquifer. Moreover, the deviations in some cases from mixing line imply water-rock interaction is also important in dominant control on groundwater chemistry, such as cation exchange, SO 4 2-reduction, and NaCl solution. The brackish water was characterized by slight excess of Na ? and deficit of Ca 2? compared to nonreactive mixing line. This indicates that the coastal aquifer is generally freshening with respect to extensive irrigation network, as well as the transfer from the Yellow River for ecological recharge into wetland.

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“…In contrast to such dynamic river processes, the delta has been subject to relatively weak ocean dynamics due to a low tidal range and a slow rate of sealevel rise (e.g. Ren and Shi, 1986;Wang et al, 1992Wang et al, , 2012Zeng, 1997;Saito et al, 2001;Hu and Cao, 2003). As a result, a large amount of sediment carried by the Yellow River has been deposited near the river mouth, forming a vast delta that has extended over 800 km during the Holocene from the Bohai Sea in the north to the Huanghai Sea in the south (Chinese Academy of Sciences, 1980;Hillel, 1991;Li and Finlayson, 1993;Van Gelder et al, 1994).…”

Section: Introductionmentioning

confidence: 99%

Progradation of the Yellow (Huanghe) River delta in response to the implementation of a basin-scale water regulation program

et al. 2015

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The water and sediment supply to the lower reach and estuary of the Yellow (Huanghe) River have been altered to a very significant degree by the construction of numerous small to large reservoirs and the progressive implementation of water and soil conservation measures across the entire drainage basin since the late 1950s, followed by a basin-scale water regulation program since 2002. There is an urgent need to know how progradation of the Yellow River delta (YRD), an area on which people live and farm, has continued and will continue to respond to these controls. This study examines the changing patterns of water and sediment supply to the YRD over the period of 1950-2013 and, using remote sensing, it evaluates the morphological changes of the delta during 1976-2013. Although both water and sediment input to the delta have been described as declining significantly since the mid 1960s, we show that since 2005 the supply of water has remained at around 20 billion m 3 yr −1 and that for sediment at about 0.13 billion t yr −1 ; water input has been even slightly increasing. The dynamics of extension/shrinking and avulsion in river-mouth channels and accretion/erosion of shorelines is an integrated response to the complex variations in both sediment and water supply. This study develops a quantitative relationship between water and sediment supply and the area of land accretion and it predicts the critical condition for land accretion in the YRD. To ensure that delta land will not be lost, care is needed in the future implementation of the basin-scale water regulation program.

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The Huanghe (Yellow River) and Changjiang (Yangtze River) deltas: a review on their characteristics, evolution and sediment discharge during the Holocene

Cited by 432 publications

References 22 publications

Four Decades of Estuarine Wetland Changes in the Yellow River Delta Based on Landsat Observations Between 1973 and 2013

Four Decades of Estuarine Wetland Changes in the Yellow River Delta Based on Landsat Observations Between 1973 and 2013

Geochemical and isotopic evidence of shallow groundwater salinization in a reclaimed coastal zone: the Yellow River Delta, China

Progradation of the Yellow (Huanghe) River delta in response to the implementation of a basin-scale water regulation program

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