The modern Yellow River Delta in transition: Causes and implications

Fu, Yutao; Chen, Shenliang; Ji, Hongyu; Fan, Yaoshen; Li, Peng

doi:10.1016/j.margeo.2021.106476

Cited by 34 publications

(27 citation statements)

References 68 publications

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“…Previous studies found that during the post-dam period, the accretion volume at the Qingshuigou subaqueous delta only reached 0.75 × 10 8 m 3 /yr, approximately 36% of the pre-dam level [50]. Because of the upstream sediment retention and reduced sediment supply to the delta during the post-dam period, both subaerial and subaqueous geomorphic evolution experienced a deltaic shrinkage tendency [70].…”

Section: Geomorphic Response Of the Yrdmentioning

confidence: 97%

“…Because of the implementation of the WSRS, 48% of external sediment was delivered from the LYR, contributing to the delta-building process of the river mouth. It was estimated that a threshold of 2.6 × 10 8 t sediment delivery could achieve the erosion-accretion balance of the whole YRD [70]. This means the post-dam yearly sediment discharge with external sediment delivery from the LYR still cannot induce net accretion at the YRD.…”

Section: Transition Of Sediment Source Of the Fluvial-deltaic Systemmentioning

confidence: 99%

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Damming-Induced Hydrogeomorphic Transition in Downstream Channel and Delta: A Case Study of the Yellow River, China

Chen

Jiang

et al. 2022

Water

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River dynamics and sediment budget play a crucial role in shaping geomorphic variability of river channels and deltaic environments. Basin-scale human activities, including dam construction, induce alterations in river flow and sediment dynamics in the downstream channels and to the delta, and quantification of sediment source shift along downstream fluvial-deltaic systems is often uncertain. This study analyzed the river regime changes and sediment dynamics of a typical sediment-laden fluvial-deltaic system—the lower Yellow River (LYR) and the Yellow River Delta (YRD) —to assess the integrated effects of dam impoundment and dam-based river regulation schemes on downstream hydrogeomorphic transition processes. The Xiaolangdi (XLD) Reservoir, which was completed in 2000 with a total storage of 12.7 km3, is the final reservoir located in the middle Yellow River and plays an important role in flood control and energy supply. Following the full operation of XLD Reservoir, the relationship between water and sediment in the LYR became more balanced, with a drastic decline of sediment input and seasonal migrations of floodwaters. The interannual variability of water levels at downstream hydrological stations indicated a geomorphic transition in the LYR from net deposition to erosion state. The building of the XLD Reservoir caused a downstream shift of river-originated sediment source and 48% of the total sediment delivered to the YRD was derived from the LYR. However, the reduced sediment delivery since 2000 has still triggered net land loss regarding the YRD system, with a strong spatial variability which is dominated by the reduced accretion at the active delta front and erosion at the abandoned river mouth and coastal engineering zone. Compared with other environmental factors, the construction of upstream dams contributed the most to the decline of downstream sediment delivery over the past decades. The challenge for sustainable sediment management is the gradual decline of scouring efficiency as the riverbed sediment is coarsening. Our study suggests that future river regulation strategies should consider the geomorphic sustainability of both the LYR and the YRD system.

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Section: Geomorphic Response Of the Yrdmentioning

confidence: 97%

Section: Transition Of Sediment Source Of the Fluvial-deltaic Systemmentioning

confidence: 99%

Damming-Induced Hydrogeomorphic Transition in Downstream Channel and Delta: A Case Study of the Yellow River, China

Chen

Jiang

et al. 2022

Water

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“…The Yellow River Delta is regarded as the youngest land in China's warm temperate zone and acts as a stopover site for about 152 protected species of migratory birds [37][38][39][40]. The Yellow River Delta mostly consists of silt and sand with a median grain size of 0.035-0.04 mm [41,42]. Over the past decades, a variety of anthropic interventions (e.g., dam constructions, agriculture irrigation and soil conservation practices) have sharply decreased the river discharge and sediment load, The Volta River Basin, which consists of the Black Volta, White Volta and Oti, covers an area of 4.00 × 10 5 km 2 [33] (Figure 1b).…”

Section: The Yellow Rivermentioning

confidence: 99%

A Tale of Two Deltas: Dam-Induced Hydro-Morphological Evolution of the Volta River Delta (Ghana) and Yellow River Delta (China)

Gao

Shao

et al. 2021

Water

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Previous studies mostly focus on an individual delta, or deltas at a global scale, to explore dam effects on deltaic hydrological alteration and morphological evolution, while comparative studies on selected similar deltas remain scarce. In this study, we compare the alteration of river discharge and sediment load, as well as the associated deltaic area and shoreline, of two deltas, namely, the Volta River Delta in Ghana and the Yellow River Delta in China, which are subject to similar forcings and mainstem dam influences. The results show that the sediment loads of the Volta River Delta and Yellow River Delta have decreased abruptly and gradually, respectively, to ~10% of the pre-dam level, presumably due to differences in reservoir capacity and upstream dam location. Sediment decline has led to a decrease of the fluvial dominance ratio, which has also been affected by the river mouth location and shoreline orientation. As a consequence, the area of the Volta River Delta has shifted to a new quasi-equilibrium, whereas the Yellow River Delta has kept prograding. This comparative study provides references for understanding the future evolution of similar deltas around the world.

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“…The Yellow River Delta (YRD) is one of the three largest deltas in China, which is also among the fastest-growing deltas worldwide; the region is rich in natural resources and contains important wetland ecosystems that provide vital habitats for rare and endangered birds [ 1 , 2 , 3 , 4 ]. However, the YRD is characterized by shallow groundwater levels and high mineralization due to its exceptional sedimentary environment, which causes soil salt to easily accumulate on the surface [ 5 , 6 ].…”

Section: Introductionmentioning

confidence: 99%

Estimation of Soil Salt Content and Organic Matter on Arable Land in the Yellow River Delta by Combining UAV Hyperspectral and Landsat-8 Multispectral Imagery

Sun

Jiang

et al. 2022

Sensors

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Rapid and large-scale estimation of soil salt content (SSC) and organic matter (SOM) using multi-source remote sensing is of great significance for the real-time monitoring of arable land quality. In this study, we simultaneously predicted SSC and SOM on arable land in the Yellow River Delta (YRD), based on ground measurement data, unmanned aerial vehicle (UAV) hyperspectral imagery, and Landsat-8 multispectral imagery. The reflectance averaging method was used to resample UAV hyperspectra to simulate the Landsat-8 OLI data (referred to as fitted multispectra). Correlation analyses and the multiple regression method were used to construct SSC and SOM hyperspectral/fitted multispectral estimation models. Then, the best SSC and SOM fitted multispectral estimation models based on UAV images were applied to a reflectance-corrected Landsat-8 image, and SSC and SOM distributions were obtained for the YRD. The estimation results revealed that moderately salinized arable land accounted for the largest proportion of area in the YRD (48.44%), with the SOM of most arable land (60.31%) at medium or lower levels. A significant negative spatial correlation was detected between SSC and SOM in most regions. This study integrates the advantages of UAV hyperspectral and satellite multispectral data, thereby realizing rapid and accurate estimation of SSC and SOM for a large-scale area, which is of great significance for the targeted improvement of arable land in the YRD.

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The modern Yellow River Delta in transition: Causes and implications

Cited by 34 publications

References 68 publications

Damming-Induced Hydrogeomorphic Transition in Downstream Channel and Delta: A Case Study of the Yellow River, China

Damming-Induced Hydrogeomorphic Transition in Downstream Channel and Delta: A Case Study of the Yellow River, China

A Tale of Two Deltas: Dam-Induced Hydro-Morphological Evolution of the Volta River Delta (Ghana) and Yellow River Delta (China)

Estimation of Soil Salt Content and Organic Matter on Arable Land in the Yellow River Delta by Combining UAV Hyperspectral and Landsat-8 Multispectral Imagery

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