scholarly journals Design water level for flood control of water conservancy projects at the inlet and confluence of branches in river basins: A case study from Guiping Shipping Hub, Xijiang River, Pearl River Basin

2020 ◽  
Vol 32 (1) ◽  
pp. 198-206
Author(s):  
GAN Fuwan ◽  
◽  
HUANG Yuming ◽  
ZHANG Huaguo ◽  
GAO Yang ◽  
...  
Keyword(s):  
Water Level ◽  
River Basin ◽  
Flood Control ◽  
River Basins ◽  
Pearl River ◽  
Pearl River Basin ◽  
Xijiang River ◽  
Water Conservancy ◽  
Design Water Level

scholarly journals Changes in stage–flow relation of the East River, the Pearl River basin: causes and implications

2012 ◽  
Vol 44 (4) ◽  
pp. 737-746 ◽  
Author(s):  
Qiang Zhang ◽  
Kun Li ◽  
Vijay P. Singh ◽  
Xiaohong Chen ◽  
Jianfeng Li
Keyword(s):  
Water Level ◽  
River Basin ◽  
Flood Control ◽  
Morphological Changes ◽  
River Channel ◽  
Pearl River Basin ◽  
Abrupt Decrease ◽  
East River ◽  
The Pearl River ◽  
High Level

Water level and streamflow extracted from 891 hydrological episodes from both dry and flood seasons covering a period of 1954–2009 were analyzed to investigate stage–flow relations. Results indicate the following. (1) Since the early 1990s the low/high flow is increasing/decreasing. The water level, particularly the high level, is consistently decreasing. An abrupt decrease of water level is observed since the early 1990s at the lower East River. (2) Stage–streamflow relation is usually stable in the river reach with no significant bedform morphological changes. Changes in the geometric shape of the river channel are the major cause of the change in the stage–streamflow relation. (3) An abrupt decrease of water level at the Boluo station is mainly the result of abnormally rapid downcutting of the riverbed due to extensive sand dredging within the channel which caused serious headwater erosion. This human-induced modification by downcutting of the river channel may lead to significant hydrological alterations and may have critical implications for flood control, conservation of eco-environment, and also for basin-wide water resources management in the lower East River basin.

scholarly journals Distribution and evaluation of diatom community in Hejiang River, a branch of Xijiang River, Pearl River basin

2015 ◽  
Vol 27 (1) ◽  
pp. 86-93 ◽  
Author(s):  
YAO Wenting ◽  
◽  
CAI Desuo ◽  
TANG Xin ◽  
WEN Hongzhan
Keyword(s):  
River Basin ◽  
Pearl River ◽  
Diatom Community ◽  
Pearl River Basin ◽  
Xijiang River

scholarly journals Dual Value System and its assessment scheme for understanding and valuing ecosystem services

2019 ◽  
Author(s):  
Haile Yang ◽  
Jiakuan Chen
Keyword(s):  
Ecosystem Services ◽  
River Basin ◽  
Human Life ◽  
Pearl River ◽  
Pearl River Basin ◽  
Value System ◽  
Basin Scale ◽  
Zhujiang River ◽  
Water Provision

AbstractValuing ecosystem services (ES) is helpful for effective ES management. However, there are many limitations in traditional ES valuation approaches, including theoretical challenges and practical difficulties. To overcome these limitations, we proposed a dual value system (DVS). And then, we presented a case study of valuing the water provision in Zhujiang River Basin (Pearl River Basin) based on DVS. DVS follows the axioms that (1) human life would end if we lose any of vital ES which is indispensable to human being’s survival (such as oxygen, freshwater) and (2) ES cannot provide any value to people without human activities. Correspondingly, DVS includes two types of value: the output support value (OSV) of a vital ES refers to the total value produced by human being’s economic and social activities (TVPH) supported by the ES consumption; the optional capacity value (OCV) of a vital ES refers to the optional capacity of supporting TVPH provided by total ES volume. The OCV provided by a vital ES is calculated by using the product of multiplying the OSV (TVPH) by the freedom of choosing the consumption from the total volume of this ES, valued in non-monetary units. Based on DVS, the OSV and OCV of water provision in Zhujiang River Basin were analyzed in river basin scale and sub-basin scale, and the values variation of water provision from 2006 to 2015 was analyzed in sub-basin scale. And then, based on this case study, we discussed the new insights into ES provided by DVS. Results proved that DVS and its assessment scheme overcame the limitations on current ES valuation approaches and provided an innovative quantitative framework to understand and value ES which will help to make good decisions in ES management.

scholarly journals Flood Monitoring in Rural Areas of the Pearl River Basin (China) Using Sentinel-1 SAR

2021 ◽  
Vol 13 (7) ◽  
pp. 1384
Author(s):  
Junliang Qiu ◽  
Bowen Cao ◽  
Edward Park ◽  
Xiankun Yang ◽  
Wenxin Zhang ◽  
...  
Keyword(s):  
River Basin ◽  
Flood Control ◽  
Mitigation Strategies ◽  
Economic Losses ◽  
Pearl River ◽  
Flood Hazards ◽  
Pearl River Basin ◽  
East River ◽  
The Pearl River ◽  
The Pearl River Basin

Flood hazards result in enormous casualties and huge economic losses every year in the Pearl River Basin (PRB), China. It is, therefore, crucial to monitor floods in PRB for a better understanding of the flooding patterns and characteristics of the PRB. Previous studies, which utilized hydrological data were not successful in identifying flooding patterns in the rural and remote regions in PRB. Such regions are the key supplier of agricultural products and water resources for the entire PRB. Thus, an analysis of the impacts of floods could provide a useful tool to support mitigation strategies. Using 66 Sentinel-1 images, this study employed Otsu’s method to investigate floods and explore flood patterns across the PRB from 2017 to 2020. The results indicated that floods are mainly located in the central West River Basin (WRB), middle reaches of the North River (NR) and middle reaches of the East River (ER). WRB is more prone to flood hazards. In 2017, 94.0% flood-impacted croplands were located in WRB; 95.0% of inundated croplands (~9480 hectares) were also in WRB. The most vulnerable areas to flooding are sections of the Yijiang, Luoqingjiang, Qianjiang, and Xunjiang tributaries and the lower reaches of Liujiang. Our results highlight the severity of flood hazards in a rural region of the PRB and emphasize the need for policy overhaul to enhance flood control in rural regions in the PRB to ensure food safety.

scholarly journals The application of environmental governance for sustainable watershed-based management

2021 ◽  
Author(s):  
Seiichi Kagaya ◽  
Tetsuya Wada
Keyword(s):  
Environmental Protection ◽  
River Basin ◽  
Watershed Management ◽  
Water Use ◽  
Flood Control ◽  
Environmental Governance ◽  
Planning Process ◽  
Environment Assessment ◽  
Control Water

AbstractIn recent years, it has become popular for some of countries and regions to adapt the system of governance to varied and complex issues concerned with regional development and the environment. Watershed management is possibly the best example of this. It involves flood control, water use management and river environment simultaneously. Therefore, comprehensive watershed-based management should be aimed at balancing those aims. The objectives of this study are to introduce the notion of environmental governance into the planning process, to establish a method for assessing the alternatives and to develop a procedure for determining the most appropriate plan for environmental governance. The planning process here is based on strategic environment assessment (SEA). To verify the hypothetical approach, the middle river basin in the Tokachi River, Japan was selected as a case study. In practice, after workshop discussions, it was found to have the appropriate degree of consensus based on the balance of flood control and environmental protection in the watershed.

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