Spatial Variability of Water Levels in River Network of the Pearl River Delta

Chen, Xiaohong; Chen, Yongqin David; Zhou, Jinghan; Zhang, Lei

doi:10.1061/40737(2004)127

Cited by 11 publications

(16 citation statements)

References 2 publications

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“…Therefore, the relative gap between nonstationary and stationary flood level in Tianhe increased. Nevertheless, the width-depth ratio in Jiangmen is 2.4 times that in Tianhe [44]. Thus, the relative gap between the nonstationary and the stationary design level in Jiangmen was narrowed abruptly from Tianhe.…”

Section: Response Of the Flood Level Along The River Channelmentioning

confidence: 97%

“…Although Rongqi was located 2 km farther from the delta outlet than Xiaolan [44], X in Rongqi was the same as in Xiaolan (Figure 8). Simply according to the distance between stations and the delta outlets, X in Rongqi was supposed to be higher than in Xiaolan.…”

Section: Leading Factors Of Non-stationarity and The Flood Level Respmentioning

confidence: 98%

“…A large portion of the flood flow (45.53%) from Makou went through Tianhe, located 13 km away from Jiangmen. However, the width-depth ratio in Tianhe was only half that in Makou [44]. Therefore, the relative gap between nonstationary and stationary flood level in Tianhe increased.…”

Section: Response Of the Flood Level Along The River Channelmentioning

confidence: 99%

“…However, the estimated X was inconsistent with our assumption. This was due to the impact of a dense river network and the directions of the development of river channels [37,44]. Rongqi was located on a river way almost parallel to the latitude.…”

Section: Leading Factors Of Non-stationarity and The Flood Level Respmentioning

confidence: 99%

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Flooding in Delta Areas under Changing Climate: Response of Design Flood Level to Non-Stationarity in Both Inflow Floods and High Tides in South China

Tang

Guo

et al. 2017

Water

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Abstract:Climate change has led to non-stationarity in recorded floods all over the world. Although previous studies have widely discussed the design error caused by non-stationarity, most of them explored basins with closed catchment areas. The response of flood level to nonstationary inflow floods and high tidal levels in deltas with a dense river network has hardly been mentioned. Delta areas are extremely vulnerable to floods. To establish reliable standards for flood protection in delta areas, it is crucial to investigate the response of flood level to nonstationary inflow floods and high tidal levels. Pearl River Delta (PRD), the largest delta in South China, was selected as the study area. A theoretical framework was developed to quantify the response of flood level to nonstationary inflow floods and the tidal level. When the non-stationarity was ignored, error up to 18% was found in 100-year design inflow floods and up to 14% in 100-year design tidal level. Meanwhile, flood level in areas that were ≤22 km away from the outlets mainly responded to the nonstationary tidal level, and that ≥45 km to the nonstationary inflow floods. This study will support research on the non-stationarity of floods in delta areas.

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Section: Response Of the Flood Level Along The River Channelmentioning

confidence: 97%

Section: Leading Factors Of Non-stationarity and The Flood Level Respmentioning

confidence: 98%

Section: Response Of the Flood Level Along The River Channelmentioning

confidence: 99%

Section: Leading Factors Of Non-stationarity and The Flood Level Respmentioning

confidence: 99%

See 2 more Smart Citations

Flooding in Delta Areas under Changing Climate: Response of Design Flood Level to Non-Stationarity in Both Inflow Floods and High Tides in South China

Tang

Guo

et al. 2017

Water

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“…A large amount of research about the water levels and possible causes can be found in the Chinese literature (e.g. Zeng et al, 1992;Huang et al, 2000;Luo et al, 2000;Yang et al, 2002;Liu et al, 2003;Chen et al, 2004). Several research projects have suggested that hydrological changes to the PRD occurred after about 1992 (Chen & Chen, 2002); however, different changing patterns can be identified at individual stations in the PRD (Yang et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

Variability of water levels and impacts of streamflow changes and human activity within the Pearl River Delta, China

Zhang

Chen

2010

Hydrological Sciences Journal

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The Pearl River Delta (PRD) is a complicated criss-cross river network. The booming economy and intensifying human activity have greatly altered the natural water levels, which threatens regional sustainable development. The Mann-Kendall trend test and the kriging interpolation method were used to detect the spatial and temporal patterns in the trends of extreme high/low water levels related to different magnitudes of streamflow, in order to explore the impacts of hydrological processes on the water-level changes throughout the PRD. The results indicate that: (a) streamflow changes at the Sanshui and Makou stations exhibit different characteristics. No significant trend can be identified in the streamflow changes at Makou station; however, the streamflow at Sanshui station shows a significant increasing trend, especially in low-flow periods. The decreasing Makou/Sanshui streamflow ratio exerts tremendous impacts on the water-level changes in the hinterland of the PRD region. (b) Extreme high/ low water levels exhibit similar changing patterns. The extreme high/low water levels in the high/normal flow periods are decreasing in both the upper PRD and the hinterland of the PRD region. Increasing extreme high/low water levels in low-flow periods can be identified in the hinterland of the PRD region. The coastal regions are characterized by increasing extreme high/low water levels. (c) Extreme high/low water levels for high/normal flow periods in the hinterland of the PRD are heavily impacted by topographic changes due to in-channel dredging. Increasing extreme high/low water levels along the coastal regions are mainly backwater effects caused by serious siltation and rising sea level. This study has scientific and practical merits in regional fluvial management and mitigation of natural hazards.Key words Mann-Kendall trend test; streamflow processes; human activity; water-level variability; Pearl River Delta Variabilité des hauteurs d'eau et impacts des changements de débit et des activités humaines dans le Delta de la Riviére des Perles, Chine Résumé Le Delta de la Rivière des Perles (DRP) est un réseau hydrographique entrecroisé complexe. L'économie florissante et l'intensification des activités humaines ont grandement altéré les hauteurs d'eau naturelles, ce qui représente une menace pour le développement durable régional. Le test de Mann-Kendall pour les tendances et la méthode d'interpolation du krigeage ont été utilisés pour détecter les patrons spatiotemporels dans les tendances des niveaux d'eau extrêmes supérieurs/inférieurs en relation avec différentes magnitudes de débit, de façon à explorer l'impact des processus hydrologiques sur les changements du niveau de l'eau à travers le DRP. Les résultats indiquent que: (a) les changements de débit aux stations de Sanshui et de Makou présentent des caractéristiques différentes. Aucune tendance significative ne peut être identifiée dans les variations de débits à Makou; alors que les débits à Sanshui montrent une tendance à la hausse significative, partic...

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Spatial assessment of hydrologic alteration across the Pearl River Delta, China, and possible underlying causes

Zhang

Chen

et al. 2009

Hydrological Processes

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Abstract:The alterations of the water level across the Pearl River Delta (PRD) were investigated using a 'range of variability approach' (RVA) based on monthly water level datasets extracted from 17 gauging stations. A mapping method was used to illustrate the spatial patterns in the degrees of alteration of water levels. The results indicated that more stations showing moderate and high alterations in monthly mean maximum and minimum water levels when compared with monthly maximum and minimum water levels. River channels characterized by higher alterations of water levels were observed mainly in the regions north of 22°30 0 N. Alterations of water levels across the PRD were a consequence of various influencing factors. However, changed hypsography due to extensive and intensive human activities, particularly the large-scale dredging and excavation of the river sand, may be taken as one of the major causes for the substantial hydrologic alteration. This study indicated that the river channels characterized by altered water levels are mostly those characterized by highly and moderately intensive sand dredging. The changed ratio of the streamflow between Makou and Sanshui stations, the major upstream flow control stations, also influenced the water level alterations of the Pearl River delta. The results of this study will be of great significance in water resources management and better human mitigation of the natural hazards due to the altered water level under the changing environment.

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Spatial Variability of Water Levels in River Network of the Pearl River Delta

Cited by 11 publications

References 2 publications

Flooding in Delta Areas under Changing Climate: Response of Design Flood Level to Non-Stationarity in Both Inflow Floods and High Tides in South China

Flooding in Delta Areas under Changing Climate: Response of Design Flood Level to Non-Stationarity in Both Inflow Floods and High Tides in South China

Variability of water levels and impacts of streamflow changes and human activity within the Pearl River Delta, China

Spatial assessment of hydrologic alteration across the Pearl River Delta, China, and possible underlying causes

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