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Preliminary study on assessment of nutrient transport in the Taihu Basin based on SWAT modeling

Science china Earth Sciences 2006年第Z1期49卷 135-145页

作者： LAI Geying, YU Ge & GUI Feng Nanjing Institute of Geography & Limnology, Chinese Academy of Sciences, Nanjing 210008, china The Graduate School of the Chinese Academy of Sciences, Beijing 100039, china key lab of poyang lake ecological environment and resource development, jiangxi normal university, nanchang 330027, china Nanjing Institute of Geography & Limnology Chinese Academy of Sciences Nanjing China The Graduate School of the Chinese Academy of Sciences Beijing China key lab of poyang lake ecological environment and resource development Jiangxi Normal University Nanchang China

With the Taihu Basin as a study area, using the spatially distributed and mechanism-based SWAT model, preliminary simulations of nutrient transport in the Taihu Basin during the period of 1995～2002 has been carried out. The topography, soil, meteorology and land use with industrial point pollution discharge, the loss of agricultural fertilizers, urban sewerage, and livestock drainages were all considered in the boundary conditions of the simulations. The model was calibrated and validated against water quality monitoring data from 2001 to 2002. The results show that the annual total productions of nitrogen (TN) and phosphorus (TP) into lake Taihu are 40000t and 2000t respectively. Nutrient from the Huxi Region is a major resource for lake Taihu. The non-point source (surface source) pollution is the main form of catchment sources of nutrients into lake Taihu,occupied TN 53% and TP 56% respectively. TN and TP nutrients from industrial point pollution discharge are 30% and 16%, and sewerage in both forms of point source and non-point source are TN 31% and TP 47%. Both the loss of agricultural fertilizers and livestock drainages from the catchment should be paid more attention as an important nutrient source. The results also show that SWAT is an effective model for the simulation of temporally and spatially nutrient changes and for the assessment of the trends in a catchment scale.

关键词： Taihu Basin, nutrients, catchment resource inputs, SWAT model, simulation.

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A preliminary knowledge-driven prediction model of snail distribution in the poyang lake region

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Chinese Science Bulletin 2008年第1期53卷 115-123页

作者： ZHAO An1,2,3 & BAO ShuMing1 1 The key lab of poyang lake ecological environment and resource development, jiangxi normal university, nanchang 330022, china 2 Institute of Geographic Sciences and resources Research, Chinese Academy of Sciences, Beijing 100101, china 3 School of Geography and environmental Sciences, jiangxi normal university, nanchang 330022, china The key lab of poyang lake ecological environment and resource development Jiangxi Normal University Nanchang China Institute of Geographic Sciences and resources Research Chinese Academy of Sciences Beijing China School of Geography and environmental Sciences Jiangxi Normal University Nanchang China

Present monitoring and prediction of schistosomiasis’s intermediate parasite, snail, are based on re-mote sensing image’s spectral signatures, and the calculation result is in fact an incom-plete-constraints solution. TM image of the poyang lake region on October 31, 2005 was combined with GIS thematic data (DEM, boundary of the poyang lake, vegetation, soil and land use) to make a prediction on snail spatial distribution in the region by remote sensing, geo-informatics and knowl-edge-driven modeling according to mechanism of snail occurrence. Result shows that with change of overall fuzzy membership of snail occurrence from high to low, snail occurrence of the snail samples of validation group goes up to 81% within 10% high fuzzy membership range, denoting high efficiency of the model in predicting snail occurrence.

关键词：鄱阳湖区域蜗牛分布模糊分类血吸虫病

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Atmospheric correction of HJ-1A/B CCD images over Chinese coastal waters using MODIS-Terra aerosol data

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Science china(Technological Sciences) 2010年第S1期53卷 191-195页

作者： TIAN LiQiao 1,LU JianZhong 1,CHEN XiaoLing 1,2,3,YU ZhiFeng 1,XIAO JingJing 1,QIU Feng 1 & ZHAO Xi 1 1 State key laboratory of Information Engineering in Surveying,Mapping and Remote Sensing,Wuhan university,Wuhan 430079,china 2key laboratory of poyang lake Wetland and Watershed Research,Ministry of Education,jiangxi normal university,nanchang 330022,china 3 The key laboratory of poyang lake environment and resource Utilization,Ministry of Education,nanchang university,nanchang 330031,china State key laboratory of Information Engineering in Surveying Mapping and Remote Sensing Wuhan University Wuhan China key laboratory of poyang lake Wetland and Watershed Research Ministry of Education Jiangxi Normal University Nanchang China The key laboratory of poyang lake environment and resource Utilization Ministry of Education Nanchang University Nanchang China

This paper demonstrates an atmospheric correction method to process HJ-1A/B CCD images over Chinese coastal waters with the aid of MODIS-Terra aerosol *** on the assumption of zero water-leaving radiance at the two near-infrared (NIR)bands or the shortwave infrared(SWIR)bands,the atmospheric aerosol optical depth(AOD)is firstly retrieved from MODIS-Terra with a simple extension of the NIR-SWIR combined atmospheric correction approach embedded in SeaDAS (SeaWiFS data analysis system).Then the"turbid"and"non-turbid"waters are separated by the turbid water *** probability of AOD at 551 nm band is derived based on the NIR information over"non-turbid"waters and FLAASH model is selected to do the atmospheric correction of the HJ-1A/B CCD imagery using the AOD values of highest probabilities as ***,according to the histogram of the AOD distribution at 551 nm band,the studied turbid water area is divided into several blocks and HJ-1A/B CCD imagery is corrected with the corresponding AOD values displayed with the highest frequency in each *** method has been applied to several HJ-1A/B images over Chinese coastal waters and validated by synchronous in-situ *** results have shown that this method is effective in the atmospheric correction process of HJ-1A/B CCD images for ocean color remote sensing study and application in the coastal waters.

关键词： ocean color remote sensing atmospheric correction turbid coastal waters HJ-1A/B MODIS

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