FACILITATING REGIONAL SUSTAINABLE DEVELOPMENT THROUGH INTEGRATED MULTI-OBJECTIVE UTILIZATION, MANAGEMENT OF WATER RESOURCES IN THE LANCANG-MEKONG RIVER BASIN

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A Numerical Model for Mixing Areas of Pollutant Discharging into Tidal Flows

- A combined numerical model for computing mixing areas of pollution vertical jet discharging into tidal flows has been developed. This numerical model is composed of a 2-D depth-averaged dynamic far-field numerical model and a 2-D vertical dynamic near-field numerical model. The former uses finite node method to compute velocity, and improved finite node method to compute pollutant concentration distribution; the latter is a k-e turbulence model, and uses SIMPLE (Semi-Implicit Method for Pressure Linked Equations) method to compute velocity. At the same time, the former provides boundary conditions for the latter. This model can simulate both far- field pollutant concentration distribution and near-field vertical recirculation quickly and precisely. This model has been verified by measured data of pollutant F of the Dachang reach of the Changjing River and test data presented by Chen el al. (1992). On the basis of verification, the authors use a designed hydrograph to compute this mixing area for a cer     

Velocity and Sediment Concentration Profiles in Sediment-Laden Flows

A theoretical analysis of velocity profiles in sediment-laden flows is presented by means of Prandtl-Karman mixing length theorem. The study shows that the upward velocity of liquid-phase caused by settling sediment leads to the invalidity of the log-law and Rouse equation. The theoretical analysis takes into account the upward velocity and shows: 1) the mean velocity in sediment-laden flows follows the log-law, but the Karman constant reduces in the main flow region, 2) sediment concentration reduces the mixing length of fluid particles, 3) flow resistance reduces with the presence of sediment concentration, and 4) the sediment concentration profile deviates from the well know Rouse equation. The experimental data agree well with the equations derived on the basis of non-zero wall velocity. It is found that the wall-normal velocity should not be neglected for density gradient flows because it induces more than for pure water flows.     

The responses of CO_2 to El Nino and La Nina in different seasons along 22°-18°N line

1 INTRoDUcTIONThe study results from Nov. 1986 to Aug. 1990 in sea area (ll5"E - 165"E, 20"N -l0"S) during TOGA experiments, indicated that there were outstanding responses of differenceof partial pressure of CO, between sea and air (APCO,) and total dissolved concentrationof CO, (TCO,) to El Nino and La Nina in NW region of the Western Tropical Pacific,including the cruise lines from ll4ofy 22"N to l30"E, l8"N and that from l8"N to 8"N,along l30"E. The characteristics of dis…     

A case study on fine weather in Western Antarctic Peninsula

1 INTRODUcrIONGreat Wall Station (62"I2'S, 58"57'W), the Chinese Antarctic statidn, situates atKing George IsIand of the western Antarctic Peninsula area with typicaI sulypolar oceancIimate. On the upper level, the area is in the polar front zone where the coId polar airand warm southern temper8te air meet; on the surface it is on one of the POlar cycIonepaths prevailing by cold westerly drift current. So it is frequentIy rainy and foggy insummer and bIowing-snowy and snow-stOrmy i…     

Characteristics and Environmental Significance of pH and EC in Summer Rainfall and Shallow Firn Profile at Yulong Snow Mountain,Lijiang City,China

The seasonal and inter-annual variations of pH and EC(electrical conductivity) at Yu-long(玉龙) Snow Mountain,Lijiang(丽江) City,are sensitive to precipitation variations and are important indicators of the atmospheric environment.The pH of summer rainfall at Lijiang City ranges from 6.7 to 7.4,and alkaline mineral salts dominate the variations of rainfall acidity.pH values in theshallow firn profile at Baishui(白水) Glacier No.1 range from 5.6 to 6.3,and EC values from 2.4 to 7.3 μs/cm.The ranges are lower than ...     

Observed Glaciohydrological Changes in China's Typical Monsoonal Temperate Glacier Region since 1980s

Under the background of significant climate warming since the 1980s,the glaciers in China's monsoonal temperate glacier region respond to the warming intensely.Based on the glaciohy-drological observations at some typical glaciers from Mts.Yulong(玉龙) and Gongga(贡嘎) of Heng-duan(横断) Mountains Range in the southeastern Tibetan plateau,the glaciohydrological changes in the temperate glacier region since the 1980s were investigated.First,the glacier terminus exhibited an accelerating retreat.Second,as the glaci...     

Detrital Zircon Geochronology and Provenance of Core Sediments in Zhoulao Town,Jianghan Plain,China

In our study,the U-Pb age spectrum of detrital zircons from terrigenous sediments is used to determine the sources.The Middle and Upper Reaches of the Yangtze River drain the western Yangtze craton and eastern Tibetan plateau,and take lots of sediments to the Jianghan (江汉) plain.Detrital zircons collected from Zhoulao (周老) core provide an ideal sample for the provenance studies.Here we report LA-ICP-MS U-Pb ages of 125 detrital zircons from one sand sample in the core sediments,which is recovered from a dep...     

重金属在碳酸钙—水界面间的沉淀反应特征

首先进行Cu^2 ,Pb^2 和Cd^2 等重金属离子溶液与方解石和轻质碳酸钙间的沉淀反应实验，然后对方解石与重金属离子的反应产物作了SEM观察与EDS能谱分析，研究表明，在本文的实验条件下，重金属与碳酸钙间的表面反应主要表现为表面沉淀，其中，Cd^2 离子在界面中的行为还涉及晶格扩散作用。