scholarly journals Planning of River System Connection Project in Panggong District of Xiangyang

2018 ◽  
Vol 246 ◽  
pp. 02041
Author(s):  
Lingkai Sun ◽  
Wenlu Zhang ◽  
Hezhen Zheng

Panggong District, surrounded by the Han River on three sides, is close to Xiangyang Ancient City. It is the key area of strategic layout of Xiangyang’s urbanization development. The low-lying topography and high-level underground water with a lack of drainage channel and rainwater storage area cause a serious problem of drainage and waterlogging prevention in this region. A river system connection project was planned to solve this problem, in which new river systems were excavated and necessary gates and pumping stations were constructed to improve the capacity of drainage and waterlogging prevention of the region. Furthermore, the operation schemes of the connection project were determined in flood season and dry season, the project benefit was analysed, and related problems were discussed.

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-16
Author(s):  
Jiang-Feng Liu ◽  
Xu-Lou Cao ◽  
Hong-Yang Ni ◽  
Kai Zhang ◽  
Zhi-Xiao Ma ◽  
...  

During deep geological disposal of high-level and long-lived radioactive waste, underground water erosion into buffer materials, such as bentonite, and gas production around the canister are unavoidable. Therefore, understanding water and gas migration into buffer materials is important when it comes to determining the sealing ability of engineered barriers in deep geological repositories. The main aim of our study is to provide insights into the water/gas transport in a compacted bentonite sample under constant volume conditions. The results of our study indicate that water saturation is obtained after 450 hours, which is similar to experimental results. Gas migration testing shows that the degree of water saturation in the samples is very sensitive to the gas pressure. As soon as 2 MPa or higher gas pressure was applied, the water saturation degree decreased quickly. Laboratory experiments indicate that gas breakthrough occurs at 4 MPa, with water being expelled from the downstream side. This indicates that gas pressure has a significant effect on the sealing ability of Gaomizozi (GMZ) bentonite.


Rural China ◽  
2016 ◽  
Vol 13 (1) ◽  
pp. 77-102

The natural environment—climate, topography, water and the like—influences and shapes rural development and peasant life. At the same time, social and economic development acts on and changes the local natural environment. The development of an agrarian economy is the result of the interactions among environmental, social, and economic factors—it cannot be explained as simply a causal relationship. This article analyzes the village of Houjiaying in eastern Hebei province to show how interactions among the natural environment, social factors, political forces, and economic conditions shaped the village’s development path. Before 1949, in consideration of Houjiaying’s natural constraints—sandy loam soil, a high level of underground water, and a poor irrigation infrastructure—sorghum, which requires little irrigation and is drought tolerant, was planted as the staple crop. During the collectivization period (1950s–1970s), improvement in water conservancy and drainage alleviated some of the constraints imposed by the natural environment. However, additional labor input was needed to achieve a smooth transition to growing different crops. Since China’s reform and opening up (1978), the planting of water-intensive crops and rapid urbanization have led to sinking water tables in North China. Houjiaying has been especially affected since its soil is sandy loam. This, combined with the rising costs of labor resulting from competition with work outside agriculture, has not only restricted Houjiaying’s transformation from “old farming” to “new agriculture,” but has also led to the rapid, although not complete, decline of crop farming and the “forced” development of a risky livestock industry.气候、地形、水利等自然环境影响和支配着农村发展和农民生活,同时,社会经济的发展也作用于、改变着当地的自然环境条件。农业经济是在自然、社会、经济等多种因素的互动下不断发展的,而非简单的因果关系可以解释。本文以侯家营为例,纳入其自然环境约束,探讨自然、社会、政治、经济等各种因素的互动如何影响该村的农业发展路径。解放前,沙壤土质、地下水位高、缺乏灌溉等自然环境约束导致侯家营村民依赖耐涝、低灌溉需要的高粱种植来满足生存需要;集体化时期,农田水利建设一定程度上缓解了自然环境条件的制约,但也必须投入更多劳动力才能实现作物的顺利改种;改革开放以后,高灌溉需求的作物种植和城镇化发展导致华北地下水位下降,侯家营因沙壤土质受影响明显,加之非农就业引致劳动力成本上升,不仅制约了其从“旧农业”到“新农业”的转型,而且在种植业内部也发生了迅速而不彻底的退出,“被迫”从事的养殖业发展曲折、投机性很强。 (This article is in English.)


2019 ◽  
Vol 11 (4) ◽  
pp. 1521-1538
Author(s):  
Muhammad Zia ur Rahman Hashmi ◽  
Amjad Masood ◽  
Haris Mushtaq ◽  
Syed Ahsan Ali Bukhari ◽  
Burhan Ahmad ◽  
...  

Abstract In transboundary river basins, climate change is being considered as a concern of higher degree than it is in other parts of the world. The Kabul River Basin, a sub-basin of the Indus River system shared by Pakistan and Afghanistan, is no exception. High level of sensitivity of its flow to temperature makes it imperative to analyse climate change impacts on the flow regime of this important river for efficient water resources management on both sides of the border. The snowmelt runoff model integrated with remote sensing snow cover product MODIS was selected to simulate daily discharges. Future projections were generated for two selected time slices, 2011–2030 (near future) and 2031–2050 (far future), based on output of an ensemble of four GCMs' RCP 4.5 and RCP 8.5 scenarios. Analysis shows a significant temperature increase under both scenarios in the near and far future at a high-altitude region of the basin which mostly receives snowfall that is also found increasing over time. Consequently, it causes a change in the flow regime and more frequent and heavier flooding events, thus calling for a joint strategy of the two riparian countries to mitigate the anticipated impacts in the basin for safety of people and overall prosperity.


1996 ◽  
Vol 465 ◽  
Author(s):  
D. O. Russo ◽  
N. B. Messi de Bernasconi ◽  
M. E. Sterba ◽  
A. D. Heredia ◽  
M. Sanfilippo ◽  
...  

ABSTRACTThe objective of the work was to evaluate the long-term capacity of sintered glass to retain high-level nuclear wastes (HLW) in near-repository conditions. We have studied the corrosion behavior of waste forms partially devitrified (43 vol.%) in different aqueous media. Devitrified samples were irradiated at doses (γ radiation from a Co 60 source) ranging from 1.4 × 106 Gy to 2.0 × 108 Gy, in order to study their aqueous corrosion resistance in simulated underground water. The results show little or no effect of irradiation on the density, microstructure and corrosion resistance. The global dissolution rate was almost constant around a value of 5×10−5 g. cm−2 d−1. Elemental dissolution rates were also unaffected by radiation.


Water ◽  
2021 ◽  
Vol 13 (18) ◽  
pp. 2477
Author(s):  
Mohammad Haroon Hairan ◽  
Nor Rohaizah Jamil ◽  
Mohammad Noor Amal Azmai ◽  
Ley Juen Looi ◽  
Moriken Camara

Tropical rivers and wetlands are recognized as one of the greatest and most abundant ecosystems in terms of ecological and social benefits. However, climate change, damming, overfishing, water pollution, and the introduction of exotic species threaten these ecosystems, which puts about 65% of river flow and aquatic ecosystems under a moderate to high level of threat. This paper aims to assess the environmental flow of the Selangor River based on the hydrological index method using the Global Environmental Flow Calculator (GEFC) and Indicators of Hydrological Alterations (IHA) software. The daily flow data collected by the Department of Irrigation and Drainage (DID), Malaysia, over a 60-year period (1960–2020) was used in this study to assess the Selangor River flow alterations. As per the results, the river flow has had two distinct periods over the last 60 years. In the first period, the river flows without any alteration and has a natural flow with high flood pulses and low flow pulses. While in the second, or post-impact, period, the flow of the river has a steady condition throughout the year with very little fluctuations between the dry and wet seasons of the year. From the overall comparison of the pre- and post-impact periods, it can be concluded that the minimum flow in the dry seasons of the year has increased, while the maximum flow has decreased in the monsoon seasons during the post-impact period. As a result, the Flow Duration Curve (FDC) and Environmental Management Class (EMC) analysis of the river flow recommends that the Selangor River be managed under EMC “C” to provide sufficient water for both human use and ecosystem conservation, which would also help to avoid a water level drop in the reservoirs. However, further holistic studies are suggested for a detailed analysis of the effects of the dams on aquatic biodiversity and ecosystem services in the Selangor River Basin.


Author(s):  
Vladislav Morozov ◽  
Sergey Belov ◽  
Ilya Kolesnikov ◽  
Victor Tatarinov

The possibility of using deep geological formations to dispose of high-level radioactive waste (HLW) is a subject raising heated debate among scientists. In Russia, the idea of constructing HLW repository in the Niznekansky granitoid massif (NKM) in Krasnoyarsk area is widely discussed. To solve this problem we are elaborating a technology associated with time - space stability prediction of the geological environment, which is subject to geodynamic processes evolutionary effects. It is based on the prediction of isolation properties stability in a structural tectonic block of the Earth’s crust for a given time. The danger is in the possibility that the selected structural block may be broken by new tectonic faults or movements on a passive fault may be activated and thus underground water may penetrate to HLW containers. 


Author(s):  
Vladislav Morozov ◽  
Victor Tatarinov ◽  
Ilya Kolesnikov ◽  
Alexander Kagan ◽  
Tatiana Tatarinova

The possibility of using deep geological formations to dispose of high-level radioactive waste (HLW) is a subject raising heated debate among scientists. In Russia, the idea of constructing HLW repository in the Niznekansky granitoid massif (NKM) in Krasnoyarsk area is widely discussed. To solve this problem we are elaborating a technology associated with time – space stability prediction of the geological environment, which is subject to geodynamic processes evolutionary effects. It is based on the prediction of isolation properties stability in a structural tectonic block of the Earth’s crust for a given time. The danger is in the possibility that the selected structural block may be broken by new tectonic faults or movements on a passive fault may be activated and thus underground water may penetrate to HLW containers.


2008 ◽  
Vol 30 (3) ◽  
Author(s):  
Nguyen Tien Cuong ◽  
Trinh Thu Phuong

Da river is the biggest one of three rivers: Da, Thao and Lo which flow into Hong river, so calculating and forecasting correctly the discharge to Hoa Binh reservoir take an important role in managing the task of flood preventing in the Hong - Thai Binh river system. In this paper, a connected hydraulic-hydrological model is developed. The model was applied to forecast the discharge into Hoa Binh reservoir in the flood season 2006. The difference of this connected hydraulic-hydrological model in comparison with the other hydrological models is using the complete Saint-Venant 1D to simulate flow in rivers. Results of verification of the model show that it is good enough for practice.


2016 ◽  
Vol 20 (1) ◽  
pp. 89-100
Author(s):  
Klaudia Rakocz ◽  
Agata Rosińska

Abstract This paper presents research aimed at the assessment of biodegradable organic carbon content changes (BDOC) during water disinfection process. The water samples examined in the research came from intakes, pumping stations at treatment plants situated in the Silesia district and water consumers. The examined water was underground water. One water sample was disinfected by sodium sub chloride while the other one by ozone. BDOC was determined using the Joret method, which involves observation of dissolved organic carbon (DOC) decrease in the examined water. The research has shown that BDOC content fluctuates at every stage of the treatment process and distribution of the examined water. Another analyzed parameter was biological stability of water.


2009 ◽  
Vol 6 (2) ◽  
pp. 2679-2732 ◽  
Author(s):  
D. Wisser ◽  
B. M. Fekete ◽  
C. J. Vörösmarty ◽  
A. H. Schumann

Abstract. This paper presents a new reconstruction of the 20th Century global hydrography using fully coupled water balance and transport model in a flexible modeling framework. The modeling framework allows a high level of configurability both in terms of input forcings and model structure. Spatial and temporal trends in hydrological cycle components are assessed under "pre-industrial" conditions (without modern-day human activities) and contemporary conditions (incorporating the effects of irrigation and reservoir operations). The two sets of simulations allow the isolation of the trends arising from variations in the climate input driver alone and from human interventions. Our findings confirm that the expansion of irrigation and the construction has significantly and gradually impacted hydrological components in individual river basins. Variations in the volume of water entering the oceans, however, are governed by variations in the climate signal alone with human activities playing secondary role. Globally, we do find a significant trend in the terrestrial discharge over the last century. The largest impact of human intervention on the hydrological cycle arises from the operation of reservoirs that drastically changes the seasonal pattern of horizontal water transport in the river system and thereby directly and indirectly affects a number of processes.


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