Impact of DEM mesh size and soil map scale on SWAT runoff, sediment, and NO3–N loads predictions

Chaplot, Vincent

doi:10.1016/j.jhydrol.2005.02.017

Cited by 207 publications

(131 citation statements)

References 16 publications

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“…The main two are lateritic red soil and rice soil, which account for 48.04% and 41.02% of the total study area, respectively. The use of detailed soil information is a crucial factor in enhancing the quality of simulation (Chaplot, 2005), so soil type and soil properties were reviewed based on data from the book Record of Guangdong Soil Types. The soil property data include sand, silt and clay contents (%), organic matter content (%), and total nitrogen (mg L -1 ), total phosphorus (mg L -1 ), available phosphorus (mg L -1 ) and bulk density (g cm -3 ).…”

Section: Data Preparationmentioning

confidence: 99%

“…We used SWAT and studied the NPS pollution from the land basin on the estuary under different temperature change scenarios for the lower Pearl River Delta. The average temperature increased by 0.74 • C over the last 100 years (1906-2005IPCC, 2007). Global temperatures are expected to rise by 1.1-6.4 • C by the end of the 21st century (2090-2099IPCC, 2007).…”

Section: Introductionmentioning

confidence: 99%

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Effects of temperature change on water discharge, and sediment and nutrient loading in the lower Pearl River basin based on SWAT modelling

Chen

Wang

et al. 2011

Hydrological Sciences Journal

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The impact of climate change on hydrological processes and nutrient input is one of the major uncertainties in projecting future global warming. The Soil and Water Assessment Tool (SWAT) model is applied to simulate the effects of temperature on the hydrology and sediment and nutrient load in the lower Pearl River Basin, South China. Calibration and validation results for SWAT showed that the Yamen estuary is appropriate for simulating the impacts of temperature change on both hydrological processes and nutrient input. The possible temperature change scenarios were set at T-2, T-1.5, T-1, T-0.5, T+0.5, T+1, T+1.5, T+2, T+2.5, T+3 • C compared to the current temperature, T• C. The results showed that the relative variation of discharge with temperature was slight. The sediment load at T+3• C is increased by 13.58% compared to that at T • C. Inorganic N and P inputs to the Yamen estuary showed an increasing trend with the temperature increase from T-2• C to T+3 • C. Global warming can reduce the vegetation land cover by slowing plant growth, which will aggravate the water and soil loss. Temperature changes would have an effect on mineralization and nitrification by changing soil temperature and temperatures. The warming is projected to cause an increase of sediment and nutrient load into the estuary and accelerate eutrophication in the coastal area.

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Section: Data Preparationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of temperature change on water discharge, and sediment and nutrient loading in the lower Pearl River basin based on SWAT modelling

Chen

Wang

et al. 2011

Hydrological Sciences Journal

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“…Resolution of 5-50 m is common for countrywide DEMs and finer than 1 m is used for local or regional areas. A DEM is used often in geographic information systems (GIS), as it is a valuable source of relief information and is simple to process; for example, meteorologists determine the relief slope and aspect for the needs of solar irradiation modeling [5], hydrologist determine sinks and river flow paths [6,7], archaeologist map the sites [8], etc.…”

Section: Introductionmentioning

confidence: 99%

Sky-View Factor as a Relief Visualization Technique

2011

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Abstract:Remote sensing has become the most important data source for the digital elevation model (DEM) generation. DEM analyses can be applied in various fields and many of them require appropriate DEM visualization support. Analytical hill-shading is the most frequently used relief visualization technique. Although widely accepted, this method has two major drawbacks: identifying details in deep shades and inability to properly represent linear features lying parallel to the light beam. Several authors have tried to overcome these limitations by changing the position of the light source or by filtering. This paper proposes a new relief visualization technique based on diffuse, rather than direct, illumination. It utilizes the sky-view factor-a parameter corresponding to the portion of visible sky limited by relief. Sky-view factor can be used as a general relief visualization technique to show relief characteristics. In particular, we show that this visualization is a very useful tool in archaeology as it improves the recognition of small scale features from high resolution DEMs.

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“…The impact of climate change and human activity on water cycle process has become one of the core contents and major issues in the study of global change [5][6][7][8]. At present, the human understanding of transformation of atmosphere water, surface water, soil water and groundwater in irrigation area under changing environment was poor, the research methods are also more concentrated in the traditional natural water-cycle model.…”

Section: Introductionmentioning

confidence: 99%

The exploration application of MIKE SHE model in Qingtongxia irrigation area water recycle

Wang¹,

Zhang²,

Chang³

2017

2nd Annual International Conference on Energy, Environmental &Amp; Sustainable Ecosystem Development (EESED 2016)

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The water diversion-transportation-drainage-return had become the dominant regional hydrological processes in Qingtongxia irrigation area. For the reason of systematically mastering water cycle rules of Qingtongxia irrigation area, this study chose MIKE SHE distributed hydrological model with physical basis to build water-cycle model of Qingtongxia irrigation area, calculated the parameters with data of underground water level and drainage flow from 2007 to 2009, and validated the parameters with same data from 2010 to 2012. Using this model, this study simulated and analyzed the conversion relationship of different water cycle factors in Qingtongxia irrigation area. The results shown that annual average evapotranspiration was 3.537 billion m³ , total drainage ditches flow was about 2.832 billion m³ , and the groundwater runoff into Yellow River was about 55 million m³ . This study firstly quantitative clarified the relationship between recharge and discharge of Qingtongxia irrigation area and the Yellow River. These will lay the foundation for studying the water circulation evolution mechanism and water resources efficient utilization under changing environment.

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Impact of DEM mesh size and soil map scale on SWAT runoff, sediment, and NO3–N loads predictions

Cited by 207 publications

References 16 publications

Effects of temperature change on water discharge, and sediment and nutrient loading in the lower Pearl River basin based on SWAT modelling

Effects of temperature change on water discharge, and sediment and nutrient loading in the lower Pearl River basin based on SWAT modelling

Sky-View Factor as a Relief Visualization Technique

The exploration application of MIKE SHE model in Qingtongxia irrigation area water recycle

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