Optimal allocation of water resources is an effective way to solve the supply and demand contradiction between users. Recently, rapid economic social development Handan has significantly increased in various industries. Superimposed on reduction incoming upstream rivers limitation total amount groundwater extraction, a large number sources such as South-to-North Water Diversion, Yellow River We...

Abstract Under the changing environment, problems of water cycle and resources in basin become extremely complex, coordination use efficiency fairness is difficult. This paper takes Yellow River Basin as key research area creates a balanced allocation method model that take into account use. The dynamic equilibrium increment brought by new source projects regulation realized, fine-tuning optimi...

Evapotranspiration is a central process of the hydrological cycle, and various water saving measures are based on it. However, there is little research work on evapotranspiration in the world. In particular, there is rare hydrological cycle-based research on the impact of channel lining on evapotranspiration in arid and semi-arid regions. This paper applies a hydrological cycle model to examine...

In jiangxi province, china, a new river will be excavated in the southern part of Qinglan Lake to drainage main flow Fuhe River into improve local flood prevention and navigation problems. A physic model is established analyze changes characteristics under different engineering schemes. The research shows that water level decreases 1.91m, velocity upstream increases 4.83 m/s, P=5% flood, which ...

Environmental legislation in the US (i.e. NEPA) requires defining baseline conditions on current rather than historical ecosystem conditions. For ecosystems with long histories of multiple environmental impacts, this baseline method can subsequently lead to a significantly altered environment; this has been termed a 'sliding baseline'. In river systems, cumulative effects caused by flow regulat...

Tertiary geological events and Quaternary climatic fluctuations have been proposed as important factors of speciation in the North American flora and fauna. Few studies, however, have rigorously tested hypotheses regarding the specific factors driving divergence of taxa. Here, we test explicit speciation hypotheses by correlating geologic events with divergence times among species in the contin...

—For populations of cutthroat trout Oncorhynchus clarkii, isolation in headwater streams may provide protection from invasion by nonnative species but also may enhance a population’s vulnerability to extirpation. We assessed the risk of extirpation for eight Colorado River cutthroat trout O. clarkii pleuriticus populations isolated above water diversion structures in the North Fork Little Snake...

River deltas belong to the most densely settled places on earth. Although they only account for 5% of the global land surface, over 550 million people live in deltas. These preferred livelihood locations, which feature flat terrain, fertile alluvial soils, access to fluvial and marine resources, a rich wetland biodiversity and other advantages are, however, threatened by numerous internal and e...

Taking Shahe and Dalang River aqueducts as an example, this paper introduces a movable reusable waterproof device for aqueduct construction, which is suitable construction scheme of structure repair waterstop belt replacement large-scale water delivery in South-to-North Water Diversion Project. It aims to solve structural damage leakage the Project, realizing with uninterrupted supply, waterles...