scholarly journals Study on the water resources optimal operation based on riverbed wind erosion control in West Liaohe River plain

2018 ◽  
Vol 379 ◽  
pp. 443-453
Author(s):  
Sun Wanguang ◽  
Li Chengzhen ◽  
Fan Baoshan
Keyword(s):  
Water Resources ◽  
Objective Function ◽  
Wind Erosion ◽  
River Flow ◽  
Optimal Operation ◽  
Water Volume ◽  
The West ◽  
Liaohe River ◽  
River Plain ◽  
Liaohe River Plain

Abstract. Rivers are drying up most frequently in West Liaohe River plain and the bare river beds present fine sand belts on land. These sand belts, which yield a dust heavily in windy days, stress the local environment deeply as the riverbeds are eroded by wind. The optimal operation of water resources, thus, is one of the most important methods for preventing the wind erosion of riverbeds. In this paper, optimal operation model for water resources based on riverbed wind erosion control has been established, which contains objective function, constraints, and solution method. The objective function considers factors which include water volume diverted into reservoirs, river length and lower threshold of flow rate, etc. On the basis of ensuring the water requirement of each reservoir, the destruction of the vegetation in the riverbed by the frequent river flow is avoided. The multi core parallel solving method for optimal water resources operation in the West Liaohe River Plain is proposed, which the optimal solution is found by DPSA method under the POA framework and the parallel computing program is designed in Fork/Join mode. Based on the optimal operation results, the basic rules of water resources operation in the West Liaohe River Plain are summarized. Calculation results show that, on the basis of meeting the requirement of water volume of every reservoir, the frequency of reach river flow which from Taihekou to Talagan Water Diversion Project in the Xinkai River is reduced effectively. The speedup and parallel efficiency of parallel algorithm are 1.51 and 0.76 respectively, and the computing time is significantly decreased. The research results show in this paper can provide technical support for the prevention and control of riverbed wind erosion in the West Liaohe River plain.

Large scale high resolution modelling of the West African rivers and aquifers

2020 ◽  
Author(s):  
Alban Depeyre ◽  
Jean-Martial Cohard ◽  
Basile Hector ◽  
Reed Maxwell ◽  
Thierry Pellarin
Keyword(s):  
Water Resources ◽  
West Africa ◽  
Large Scale ◽  
River Flow ◽  
Hydrological Cycle ◽  
Soil Parameters ◽  
Global Changes ◽  
The West ◽  
Main Challenge

<p>West Africa has been classified as one of the most vulnerable regions in the world for water resources to face global changes, both climatic and demographic. The population is expected to double by 2050 leading to increased pressure on the use of water resources. In this context, it is necessary to understand the dynamics of major African hydrosystems as large rivers (Niger river, Senegal river...) and transboundary aquifers in order to predict the fate of water resources for the next decades. The ParFlow-CLM physical-based model was chosen for its ability to simulate surface water and groundwater dynamics in a coupled manner. This type of modelling makes it possible to represent the main hydrological processes observed over the whole West Africa region. It operates at a relatively fine spatial resolution (1 km²). The main challenge is to determine the hydrodynamic parameters of the soil for the entire region and on a 100 m thickness (i.e. 3.5 million pixels times 11 layers).</p><p>As a first step, the model was implemented on two catchments monitored by the AMMA-CATCH observatory. These two watersheds are representative of the major and contrasted processes found in WA : being respectively representative of Sudanian and Sahelian climates. In order to assess the relevance of the regional databases (SoilGrids and GLHYMPS), simulations were carried out with original and adjusted (based on observations) soil parameters and results were evaluated with local measurements. It appears that the deep weathered lithology is not considered in databases for most of hard-rock areas in intertropical areas with no tectonic uplift. Aquifer thicknesses, permeabilities and porosities have to be significantly enhanced for the model to represent the correct flow paths. Furthermore, in the Sahel where most of the annual precipitation falls during a dozen events only, a crust layer (consistent with observations) has been added to represent the large runoff coefficients which lead to the early season floods.</p><p>In a second step, the model was implemented at the West Africa scale using the adjusted soil parameters. These parameters were obtained using a simple linear law that have been applied uniformly over the entire domain and a mask over a part of the Sahel representative of the crusting zones. Results will be compared with both remotely sensed and in situ data : GRACE provides water stock variations at a very large scale, MERRA and ERA reanalysis provide evapotranspiration data. Altimeters and in situ measurements provide river flow data. In the near future the launch of the SWOT satellite will bring new observations to complete the current one. The evaluation of the different compartments of the hydrological cycle should reveal spatial discrepancies in the model's ability to represent processes, highlighting the points on which further work should focus.</p>

Soil Inorganic Phosphorus Fractions as Affected by Fertilization

2011 ◽  
Vol 322 ◽  
pp. 108-111 ◽  
Author(s):  
Bao Tong Huang ◽  
Hua Zhou ◽  
Huai Xiang Ding
Keyword(s):  
Inorganic Phosphorus ◽  
Inorganic P ◽  
Liaohe River ◽  
Inorganic P Fractions ◽  
P Application ◽  
River Plain ◽  
P Addition ◽  
Liaohe River Plain ◽  
Different Levels ◽  
Inorganic Phosphorus Fractions

A fifteen-year field trial (started in 1990) was conducted to determine the inorganic P fractions under 8 classical modes of fertilization in the lower reach of Liaohe River Plain. The results showed that Ca2-P, Ca8-P, Al-P and Fe-P decreased in the absence of P application, while increased with supplemental P addition. Interestingly, O-P and Ca10-P, with low bioavailability, increased at different levels under all treatments after 15 years. The contents of inorganic P were low in crop stalk, indicating that P supplying capacity was weak. On the contrary, both fresh pig excretion and decomposed manure were huge inorganic P pools.

First record of the genus Aneuclis Förster (Hymenoptera, Ichneumonidae) from China

Zootaxa ◽  
2021 ◽  
Vol 4908 (2) ◽  
pp. 292-296
Author(s):  
YA-WEI WEI ◽  
YONG-BIN ZHOU ◽  
MAO-LING SHENG
Keyword(s):  
New Species ◽  
Forest Ecosystem ◽  
First Record ◽  
Liaoning Province ◽  
Research Station ◽  
Liaohe River ◽  
River Plain ◽  
Liaohe River Plain ◽  
A New Species

A new species of the genus Aneuclis Förster, 1869, A. flavopedes Sheng, Zhou & Wei, sp.nov. collected from the field of the Research Station of Liaohe-River Plain Forest Ecosystem, Zhangwu, Liaoning Province, China, is described and illustrated. The new species is inserted into the key provided by Khalaim (2004). 

Evaluation of Carbon Sequestration Potential in Cropland Soil of Lower Reaches of Liaohe River Plain

2013 ◽  
Vol 726-731 ◽  
pp. 4938-4944
Author(s):  
Dan Song ◽  
Shuang Yi Li ◽  
Chen Feng ◽  
Jiu Bo Pei ◽  
Jing Kuan Wang
Keyword(s):  
Carbon Sequestration ◽  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Paddy Field ◽  
Dry Land ◽  
Carbon Sequestration Potential ◽  
Liaohe River ◽  
Sequestration Potential ◽  
River Plain ◽  
Liaohe River Plain

Lower reaches of Liaohe River Plain is one of the areas where has a long history of planting in China, thus the enhancement of the capacity of soil carbon sequestration in cropland of this area has an important influence on global green house gases mitigation.Based on the 2nd National Soil Inventory data and the latest results from cropland productivity evaluation,the statistical model of soil carbon sequestration potential established by Qin et al. [, the soil organic carbon (SOC) sequestration potential was estimated and the differences of carbon sequestration ability between dry land and paddy field were compared according to the SOC spatio-temporal changes in cropland of Lower reaches of Liaohe River Plain over the last 30 years.The results show that the organic carbon density (SOCP) is 4.95 kg m-2 when the cropland soil organic carbon is saturated. The organic carbon storage in soil surface is 127.33 Tg in this area with an increase of 57.52 Tg. The organic carbon sequestration ability in paddy field is bigger than dry land in Lower reaches of Liaohe River Plain.

Research of Spatial-temporal Evolution of Groundwater Vulnerability in the Lower Reach of Liaohe River Plain

2016 ◽  
Vol 36 (10) ◽  
Author(s):  
奚旭 XI Xu ◽  
孙才志 SUN Caizhi ◽  
吴彤 WU Tong ◽  
郑德凤 ZHENG Defeng
Keyword(s):  
Temporal Evolution ◽  
Groundwater Vulnerability ◽  
Lower Reach ◽  
Liaohe River ◽  
River Plain ◽  
Liaohe River Plain
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