Yi L.,Nanjing University |
Yi L.,CAS Institute of Remote Sensing |
Zhang W.-C.,CAS Institute of Remote Sensing |
Yan C.-A.,Kunming Institute of Environmental Science
Hydrology Research | Year: 2017
Aiming at quantifying the impacts of soil properties on rainfall-runoff processes, the soil saturated hydraulic conductivity (Ks) and the soil erodibility factor (K) were selected and incorporated into the classical topographic index ln(α/tanβ) (TI) to construct a modified topographic index (TI0). Stream network extractions and performance evaluations of topography-based hydrological models based on TI and TI0 were carried out in three watersheds with different climate conditions. The investigations indicated that: (1) the changes of stream networks caused by the incorporation of Ks·K could correctly present the phenomenon that the points would show greater potential to be saturated to become contributing areas if their underlying soils possess higher hydraulic conductivities and stronger erodibility; and (2) the performances of the topography-based hydrological models TOPMODEL and TOPX were improved when simulating the daily rainfall-runoff processes with the input of ln(α/(tanβ·Ks·K) (TI3). TI3 was suitable for rainfall-runoff simulation in arid and semi-arid, humid and semi-humid, and humid regions. The performance improvements increased as the spatial heterogeneity of Ks·K enlarged. Based on these investigations, TI3 was recommended for the modified form of TI0. © IWA Publishing 2017.
Yan C.-A.,Nanjing University |
Yan C.-A.,Kunming Institute of Environmental Science |
Zhang W.,CAS Institute of Remote Sensing |
Zhang Z.,Nanjing University of Posts and Telecommunications |
And 6 more authors.
PLoS ONE | Year: 2015
Water quality assessment at the watershed scale requires not only an investigation of water pollution and the recognition of main pollution factors, but also the identification of polluted risky regions resulted in polluted surrounding river sections. To realize this objective, we collected water samplings from 67 sampling sites in the Honghe River watershed of China with Grid GIS method to analyze six parameters including dissolved oxygen (DO), ammonia nitrogen (NH3-N), nitrate nitrogen (NO3-N), nitrite nitrogen (NO2-N), total nitrogen (TN) and total phosphorus (TP). Single factor pollution index and comprehensive pollution index were adopted to explore main water pollutants and evaluate water quality pollution level. Based on two evaluate methods, Geo-statistical analysis and Geographical Information System (GIS) were used to visualize the spatial pollution characteristics and identifying potential polluted risky regions. The results indicated that the general water quality in the watershed has been exposed to various pollutants, in which TP, NO2-N and TN were the main pollutants and seriously exceeded the standard of Category III. The zones of TP, TN, DO, NO2-N and NH3-N pollution covered 99.07%, 62.22%, 59.72%, 37.34% and 13.82% of the watershed respectively, and they were from medium to serious polluted. 83.27% of the watershed in total was polluted by comprehensive pollutants. These conclusions may provide useful and effective information for watershed water pollution control and management. © 2015 Yan et al.
Bai Y.,CAS Research Center for Eco Environmental Sciences |
Bai Y.,Peking University |
Shi Q.,China University of Geosciences |
Wen D.,Peking University |
And 5 more authors.
PLoS ONE | Year: 2012
Bacteria play an important role in the decomposition and cycling of a variety of compounds in freshwater aquatic environments, particularly nutrient-rich eutrophic lakes. A unique Chinese eutrophic lake - Dianchi - was selected for study because it has two separate and distinct basins, Caohai with higher organic carbon levels and Waihai with lower organic carbon levels. Sediment bacterial communities were studied in the two basins using samples collected in each season from June 2010 to March 2011. Barcoded pyrosequencing based on the 16 S rRNA gene found that certain common phyla, Proteobacteria, Bacteroidetes, Firmicutes and Chloroflexi, were dominant in the sediments from both basins. However, from the class to genus level, the dominant bacterial groups found in the sediments were distinct between the two basins. Correlation analysis revealed that, among the environmental parameters examined, total organic carbon (TOC) accounted for the greatest proportion of variability in bacterial community. Interestingly, study results suggest that increasing allochthonous organic carbon could enhance bacterial diversity and biomass in the sediment. In addition, analysis of function genes (amoA and nosZ) demonstrated that ammonia-oxidizing bacteria (AOB) were dominant in sediments, with 99% belonging to Nitrosomonas. Denitrifying bacteria were comparatively diverse and were associated with some cultivatable bacteria. © 2012 Bai et al.
He J.,Beijing Normal University |
He J.,Kunming Institute of Environmental Science |
Deng W.,Kunming Institute of Environmental Science |
Chen C.,Kunming Institute of Environmental Science |
And 4 more authors.
Environmental Earth Sciences | Year: 2015
To determine the ammonia nitrogen adsorption and release characteristics of surface sediments in Dianchi Lake, 36 surface sediment (0–10 cm) samples were collected in 2013. Results showed that compared with other lakes in China (e.g. Erhai Lake and Taihu Lake), Dianchi Lake had high levels of ammonia nitrogen (NH4 +–N) adsorption capacity, release rate and release capacity. The ammonia nitrogen release risk of Dianchi sediments was relatively high. Comparison of the equilibrium ammonium concentration (ENC0) in surface sediments and the ammonium contents in the overlying water of Dianchi Lake indicated that ENC0 was high for most lake sections. Therefore, the sediments of Dianchi Lake would be a pollution source, and ammonia nitrogen release risk was high because the surface sediments of Dianchi Lake were heavily contaminated with nitrogen. The total nitrogen (TN) and NH4 +–N contents of the sediments of Dianchi Lake greatly influenced the ammonia nitrogen adsorption–release process. Aside from TN, nitrogen fractions should also be studied when assessing pollutant release risk from lake sediments. NH4 +–N was the main fraction of nitrogen released from sediments, which was highly significant when evaluating sedimentary release capacity. The sedimentary release capacity and release potential of nitrogen provided important information to assess release risks. © 2015, Springer-Verlag Berlin Heidelberg.
Huang B.,Kunming University of Science and Technology |
Zhu X.-M.,Kunming University of Science and Technology |
Zheng J.-L.,Kunming Institute of Environmental Science |
Xie L.-L.,Kunming University of Science and Technology |
Zhao H.-Y.,Kunming University of Science and Technology
2012 2nd International Conference on Remote Sensing, Environment and Transportation Engineering, RSETE 2012 - Proceedings | Year: 2012
A drainage Simulating for the effect of type of urban water consumption to the combined drainage networks based on the Storm Water Management Model was established. The type and period of urban water consumption base on residential area, marketplace, school area, and guesthouse area in Kunming Chuangfang river basin and two rainfall situation (P=1a and P=3a) in different periods were introduced into the model, and their effect to the sub-catchments was simulate. The results showed that the type and peak of urban water consumption have a great effect for the drainage ability of sub-catchments in the combined drainage networks, there are 9.1% and 21.4% nodes overflow, 54.4% and 65.2% conduits occured full conduits in biggest in two rainfall situations, and the different types of area and drainage peak time have been influenced to the flow of outlet in the same rainfall condition in Kunming Chuanfang river basin and the effect of water consumption in the marketplace is a greatest. The research harvest will provide strong technical support for rebuild drainage network in Kunming or other city. © 2012 IEEE.
Zhao L.L.,Kunming University of Science and Technology |
Yang Y.Z.,Kunming University of Science and Technology |
Zhang M.,Kunming Institute of Environmental Science |
Li Y.W.,Kunming University of Science and Technology |
Jiang Y.X.,Kunming University of Science and Technology
Advanced Materials Research | Year: 2014
Lanthanum-copper Composite Oxide Compounds were prepared from lanthanum chloride (LaCl3) and copper chloride (CuCl2), and used sodium hydroxide (NaOH) as precipitating agent. The research results showed that: the best preparation condition, which is the copper content3%;water bath temperature,70°C; agitation time,2 hours; calcination temperature,400°C; calcination time,1hour.The adsorption capacity of adsorbent was 63.88mg/g in this state. Analysis results indicate that Copper-doped crystal form dense granule in favour of phosphate adsorption. And La2O3 is very important on removing the phosphate. © (2014) Trans Tech Publications, Switzerland.
Zhang C.-N.,Kunming University of Science and Technology |
Zhang C.-N.,Kunming Institute of Environmental Science |
Ning P.,Kunming University of Science and Technology |
Ma C.-X.,Kunming University of Science and Technology
Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of Technology | Year: 2010
The mathematical physics models were founded to reflect the physical phenomenon in the air turbulent flow and dispersion with dense gases in the plateau mountainous city, according to the principles of CFD. The condition to determine the solution was given. They were solved by means of a method based on the SIMPLE algorithm. The influence of dense gas density, air pressure and air temperature on the process of dense gas dispersion was analyzed by this model, the simulation result of flow field and concentration field was verified by the wind tunnel experiment. It shows that the the larger the density of dense gas is, the more obvious the effect of dense gas is. With the same mass flow rate and other condition, the larger the air pressure is, the lower the air temperature is, and the higher the air turbulent dispersion coefficient is, the bigger the dense gas concentration at the same site is. The concentration of dense gas at the normal air pressure is less 6.2%~24.7%, average 19.8%, than plateau with 810 hPa, and the concentration of dense gas at 0°C is 6.9%~8.9% or average 8.2%, less than plateau with 23.5°C.
Zhou X.,Huazhong University of Science and Technology |
Zhou X.,Hubei Key Laboratory for Engineering Structural Analysis and Safety Assessment |
Wang F.,Huazhong University of Science and Technology |
Hu H.,Huazhong University of Science and Technology |
And 3 more authors.
Biomass and Bioenergy | Year: 2011
This paper assesses the sustainable biomass resource for energy in China. Assessment has been carried out for the following resources: (i) agricultural residues, (ii) forest residues, and (iii) municipal solid waste (MSW). The potential of each resource is estimated for the base years 2008, 2008, and 2007. The energy potentials of these resources in 2008, 2008, and 2007 are estimated to be 14.7, 3.9, and 0.2. EJ, respectively. The total potential including the energy of 6.4. EJ from the proposed low-input high-diversity (LIHD) grassland biomass on the untilled lands for the base years 1996 is equal to about 30.2% of China's energy consumption in 2008. Furthermore it is projected that sustainable biomass use for energy will reduce net emissions of green house gases (GHG) of 3276.7 million tonnes, and help in emission-reduction target of China and the world. © 2010 Elsevier Ltd.
Li S.,CAS Wuhan Institute of Geodesy and Geophysics |
Li S.,University of Chinese Academy of Sciences |
Zhang L.,CAS Wuhan Institute of Geodesy and Geophysics |
du Y.,CAS Wuhan Institute of Geodesy and Geophysics |
And 4 more authors.
Environmental Modeling and Assessment | Year: 2016
The identification of critical source areas (CSAs) and critical source periods (CSPs) are essential prerequisites for cost-effective practices of non-point source (NPS) pollution control. A simple empirical tool combining Export Coefficient Model (ECM) and a Geographic Information Systems (GIS)-based weighting scheme of watershed heterogeneity was proposed to estimate annual and monthly phosphorus loss, to identify critical source areas and periods, and to assess pollution control practices. The GIS-based weighting scheme was developed to represent the transport potential of runoff to move phosphorus from the land surfaces to waters, as a supplement to the source-based ECM. The empirical tool was applied to the Dianchi Lake watershed of China. The results showed that the total phosphorus loss from NPS in 2008 was 352.3 tons. The agricultural land was recognized as the largest and the most spatially various source type. The lakeside plain and the terraces of the watershed were identified as CSAs, which generated more than 90 % of non-point phosphorus. The early part of wet season (from May to August) was the CSPs, when about 70 % of non-point phosphorus was lost. The reduction of phosphorus fertilizers and the vegetated buffer strips (VBS) were effective in controlling phosphorus loss from NPS in the watershed. A reduction of 20 % in phosphorus fertilizer application combined with the set-up of VBS in both riparian area of the main watercourses and the lakeside areas would decrease 25 % of phosphorus loss. © 2016 Springer International Publishing Switzerland
Wang S.D.,Kunming Institute of Environmental Science |
Cheng S.,Kunming Institute of Environmental Science |
Zhang J.,Kunming Institute of Environmental Science |
Zhao H.Y.,Kunming Institute of Environmental Science |
And 2 more authors.
Applied Mechanics and Materials | Year: 2014
In the present study, organic-inorganic hybrid mesoporous material (HMC) were used to optimize the removal rate for Cr(VI) by applying Response Surface Methodological approach. Batch mode experiments were also carried out to assess the adsorption equilibrium in aqueous solution. The effect of three parameters, that is pH of the solution (1.5-2.5), initial concentration (100-500 mg/L) and adsorbent dose (0.05-0.15 g/ 50 mL) was studied for the removal of Cr(VI) by HMC. Box-Behnken model was used as an experimental design. The optimum pH, adsorbent dose and initial Cr(VI) concentration were found to be 2.0, 0.05 g/L and 500 mg/L, respectively. Under these conditions removal adsorption capacity of Cr(VI) was found to be 337. © (2014) Trans Tech Publications, Switzerland.