排序方式： 共有6条查询结果，搜索用时 93 毫秒
1
1.
Evaluation of MODIS NDVI and LST for indicating soil moisture of forest areas based on SWAT modeling
Park Jong-Yoon Ahn So-Ra Hwang Soon-Jin Jang Cheol-Hee Park Geun-Ae Kim Seong-Joon 《Paddy and Water Environment》2014,12(1):77-88
This study examined the capability of remotely sensed information gained using the terra moderate resolution imaging spectroradiometer (MODIS) normalized difference vegetation index (NDVI) and land surface temperature (LST) to explain forest soil moisture. The soil and water assessment tool (SWAT) was used for the analysis. Nine years (2000–2008) of monthly MODIS NDVI and LST data from a 2,694.4 km2 watershed consisting of forest-dominant areas in South Korea were compared with SWAT simulated soil moisture. Before the analysis, the SWAT model was calibrated and verified using 9 years of daily streamflow at three gauging stations and 6 years (2003–2008) of daily measured soil moisture at three locations within the watershed. The average Nash–Sutcliffe model efficiency during the streamflow calibration and validation was 0.72 and 0.70, respectively. The SWAT soil moisture showed a higher correlation with MODIS LST during the forest leaf growing period (March–June) and with MODIS NDVI during the leaf falling period (September–December). Low correlation was observed in the year of frequent rains, regardless of the leaf periods. 相似文献
2.
Jung Chung-Gil Park Jong-Yoon Kim Seong-Joon Park Geun-Ae 《Paddy and Water Environment》2014,12(1):251-261
Paddy and Water Environment - In this study, a potential system for achieving rice intensification (SRI) water management in an agricultural watershed of South Korea was evaluated using the... 相似文献
3.
In-Kyun Jung Jong-Yoon Park Geun-Ae Park Mi-Seon Lee Seong-Joon Kim 《Paddy and Water Environment》2011,9(3):275-290
A grid-based, KIneMatic wave STOrm Runoff Model (KIMSTORM) is described. The model adopts the single flow-path algorithm and
routes the water balance during the storm period. Manning’s roughness coefficient adjustment function of the paddy cell was
applied to simulate the flood mitigation effect of the paddy fields for the grid-based, distributed rainfall-runoff modeling.
The model was tested in 2296 km2 dam watershed in South Korea using six typhoon storm events occurring between 2000 and 2007 with 500 m spatial resolution,
and the results were tested through the automatic model evaluation functions in the model. The average values of the Nash–Sutcliffe
model efficiency (ME), the volume conservation index (VCI), the relative error of peak runoff rate (EQp), and the absolute error of peak runoff (ETp) were 0.974, 1.016, 0.019, and 0.45 h for calibrated storm events and 0.975, 0.951, 0.029, and 0.50 h for verified storm
events, respectively. In the simulation of the flood mitigation effect of the paddy fields, the average values of the percentage
changes for peak runoff, total runoff volume, and time to peak runoff were only −1.95, −0.93, and 0.19%, respectively. 相似文献
4.
Seong-Joon Kim Hyung-Joong Kwon In-Kyun Jung Geun-Ae Park 《Paddy and Water Environment》2003,1(3):149-155
The simulated streamflow from Thiessen average rainfall (T) and spatially distributed rainfall (R) may be significantly different from each other. To identify the hydrologic effects quantitatively, the grid-based kinematic wave storm runoff model was adopted. The model predicts temporal and spatial variations of surface and subsurface flow at each cell by calculating the water balance, and routes the streamflow to the outlet. The model was tested at the Yeoncheondam watershed (1,875 km2), one third of which belongs to North Korea. The watershed is elongated to north and south directions crossing the border. Four rain gauges cover the watershed within the territory of South Korea, while no records from North Korea are given. The simulated results showed the large differences in runoff volume and peak flow rates between T and R when rain moves in a north to south direction. The simulated results of east-to-west-direction storms showed little difference in the hydrographs. The hydrograph was strongly affected by the spatial variations of the rainfall moving along the stream of the watershed. 相似文献
5.
Geun-Ae Park Hyung-Jin Shin Mi-Seon Lee Woo-Yong Hong Seong-Joon Kim 《Paddy and Water Environment》2009,7(4):271-282
This study is to assess the climate change impact on the temporal variation of paddy rice irrigation reservoir water level
from the future evaluated watershed inflow, and to suggest an adaptation method of the future reservoir water level management
for stable water supply of paddy irrigation demands. A 366.5 km2 watershed including two irrigation reservoirs located in the upper middle part of South Korea was adopted. For the future
evaluation, the SLURP model was set up using 9 years daily reservoir water level and streamflow records at the watershed outlet.
The average Nash-Sutcliffe model efficiencies for calibration and validation were 0.69 and 0.65, respectively. For the future
climate condition, the NIES MIROC3.2 hires data by SRES A1B and B1 scenarios of the IPCC was adopted. The future data were
downscaled by applying Change Factor statistical method through bias-correction using 30 years past weather data. The results
of future impact showed that the future reservoir storages of autumn and winter season after completion of irrigation period
decreased for 2080s A1B scenario. Considering the future decrease of summer and autumn reservoir inflows, the reservoir operation
has to be more conservative for preparing the water supply of paddy irrigation, and there should be a more prudent decision
making for the reservoir release by storm events. Therefore, as the future adaptation strategy, the control of reservoir release
by decreasing in August and September could secure the reservoir water level in autumn and winter season by reaching the water
level to almost 100% like the present reservoir water level management. 相似文献
6.
Jung In-Kyun Lee Dong-Ryul Park Jong-Yoon Park Geun-Ae Kim Seong-Joon 《Paddy and Water Environment》2015,13(2):167-177
Paddy and Water Environment - This study describes the application of distributed hydrologic model, KIneMatic wave STOrm Runoff Model (grid-based KIMSTORM) to simulate the flood discharge... 相似文献
1