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The progress of China's fast-paced urbanization is a land development process. Driven by “land bonus”, many lands with high quality visual resources have been used to develop estate in an unsustainable way. In the basis of drawing the relevant theory and research approach both at home and abroad, the paper attempts to present some strategies of visual resources protection and reserve basing on the...
There exist the interaction between lake and ambient rivers. This study focuses on the total and bioavailable concentrations of trace elements in river sediments around the northern Taihu Lake. We can recognize the characteristics of trace elements in different sites by comparing the west, north and the east rivers and evaluate the contamination level of sediment. The concentrations of TP and TN in...
The object of this paper was carried out to detect distribution characteristics of two important heavy metal-Cu, Pb in surface sediment in Huangpu River which is the main stream situated in Shanghai city. All the 30 samples were classified into four types corresponding to the sediments from spring, summer, autumn and winter in 2006, respectively. The concentration of Cu and Pb in surface sediment...
Located in the central area of Dali in Yunnan Province, the Erhai Lake Basin is an important agricultural industry base in China with its unique geographical and climate conditions, etc. However, the agricultural structure and land-use patterns in the basin have had some impact on the water environment in Erhai Lake Basin, and soil and water loss and the agricultural area pollution are important factors...
Water surface temperature(WST) is an important parameter in aquatic ecology and environment. The WST in Lake Taihu has a good relationship with the algae bloom. Thermal infrared remote sensing will provide a effective tool for detecting the WST. China HJ satellite is another satellite monitoring environment pollution and natural disasters which is subsequent to China FY, CBERS and HY satellite launched...
Bosten Lake, which locates in arid and desert zone, is the largest lake in Xinjiang, and is the largest inland freshwater lake in China. It has giant value in environment, ecology and economy. The water level of Bosten Lake has taken place tremendously in the recent 50 years, the water level descended from 1048m above sea level in 1958 to that of 1045m in 1987, and ascended from 1045m to 1048.9m during...
Traditional field sampling methods are expensive and inadequate to resolve continuous sediment dynamics in complex lake, due mainly to the complex interactions among optically active substances. To address this problem, MODIS images were used to map total suspended solid (TSS)concentration, a linear regression model was developed between bands combination (band3-band1) MODIS Terra500m data and in...
Standing water extent is important information for the management of water resources. In the past, this information was collected by using aerial photos and ground surveys. These traditional methods are time-and cost-consuming. At present, satellite imagery is used for this purpose more and more extensively. In this paper, the western part of Hongze Lake and its adjacent upland were taken as test...
The contents and characteristics of ten heavy metals in surface sediments from Yangzonghai Lake in Yunnan, China were analyzed. Ecological risk index presented by Håkanson to assess the potential ecological risk of Yangzonghai Lake was utilized. The results showed that the average concentrations of titanium(Ti), manganese(Mn), zinc(Zn), vanadium(V), chromium(Cr), copper(Cu), nickel(Ni), cobalt(Co),...
To examine the abnormal runoff characteristics and their influencing factors along the mid-lower reaches of the Yangtze River (MLRYR) during the different extreme drought hydrological years of 1978 and 2006, history records of water levels and discharges were collected at Yichang, Hankou, Datong, Chenglingji, and Hukou stations. The Dongting and Poyang Lakes in the middle part play important roles...
Zhangze Reservoir, which plays significant role to fulfill industrial and municipal water supply, irrigation and flood control, is one of the water source of Changzhi City in Shanxi Province, China. At present, water pollution of Zhangze Reservoir has exerted enormous influences on sustainable development of the basin, and produced greater threat to the health of people surrounding the reservoir....
Nowadays, the harmful blue-green algae blooms on lakes or streams threaten the daily life of millions of people in China. In this paper, we demonstrate the sensor network system we built on Lake Tai for the surveillance and cleanup of the algae blooms which is at work in Wuxi City, Jiangsu Province. We designed the sensor device and algorithm to monitor the algae bloom and estimate the bloom area...
Contents of colloidal trace metals(1kD~1μm) in Meiliang Bay, an algal-bloom bay of Taihu Lake, and Gonghu Bay, a macrophytes dominanted bay of Taihu Lake, were investigated in April by using cross-flow ultrafiltration (CFF) technique. In each sampling site, 20 L surface water was pumped and filtrated by 63 μm nylon sieve. The filtered water was carried to laboratory in 2 hours, prefiltrated by 1μm...
In view of the characters of hydrologic and meteorological situation in the cold mountain areas, the paper dispersed the watershed into the minimum grids. Through analysis on the different effect of solar shortwave radiation flux on ground surfaces at the same elevation grid, the redistribution of surface cold and heat source due to topography variation and snowmelt runoff were studied. Then, topography...
On the basis of the datasets from the routine meteorological observations, radar, satellite and NCEP reanalysis and using numerical simulation and diagnostic analysis, this paper studies the mechanism of cold-air snowstorms and the cause of locally strong cold-air snowstorms in the north of Shandong Peninsula. The results indicate that the mechanism of cold-air snowstorms in the Shandong Peninsula...
The Chlorophyll-a (Chl-a) concentrations in water is of great importance for the monitoring of water quality and ecosystem balance. Remote sensing offers a convenient and systematical tool for the observations of water at a long time scale. In this paper, we present a study of Chl-a estimation using the reflectance models (MOD3 and MOD2) derived from the Medium Resolution Spectral Image (MERSI) onboard...
Extracting digital drainage network and physical descriptions of watershed based on DEM is the precondition of research on building distributed hydrological model and hydrological simulation. There're some traditional methods to extract digital drainage network based on DEM. Aiming at the deficiencies of those methods, many scholar provide improved methods such as extending virtual river network information...
Lake water is an essential renewable resource for mankind and the environment and it is important for civil drink water supply. Shitoukoumen reservoir, one of the most important drink water supplies, is taken as examples to assess the water quality by multi-temporal Landsat TM/ETM data. The multiple scattering model within the water is applied to simulate the radiative transfer for retrieval of the...
Using 5 periods' remote sensing images covering 20 years from 1987 to 2008 of Tianjin city, this paper extracted the coastline and the wetlands from different years utilizing different methods and techniques of data image processing and visual interpretation based on the characteristic of each RS image. The paper analyzed the law of the coastline and the wetlands changes in both spatial and temporal...
Qaidam Basin is one of the largest arid regions in the middle latitude Asia, which is surrounded by high mountains. The ecosystem of this region is fragile due to limited annual precipitation amounts in the interior basin and large temperature differentia between winter and summer on the surrounding mountains. Several researchers have reported vegetation cover in this area had degraded in the past...
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