scholarly journals Evaluating the Dominant Controls of Water Erosion in Three Dry Valley Types Using the RUSLE and Geodetector Method

Land ◽  
2021 ◽  
Vol 10 (12) ◽  
pp. 1289
Author(s):  
Chao Yang ◽  
Jianrong Fan ◽  
Jiali Liu ◽  
Fubao Xu ◽  
Xiyu Zhang
Keyword(s):  
Environmental Sustainability ◽  
Water Erosion ◽  
Vegetation Coverage ◽  
Dominant Factor ◽  
Dry Valleys ◽  
A Value ◽  
Land Use Types ◽  
Dry Valley ◽  
Restoration Strategies ◽  
Factor Interactions

The dry valley is a unique geographic phenomenon in Southwest China with severe water erosion. However, little is known regarding its dominant controls and the discrepancies between dry valley subtypes, leading to the poor management of water erosion. To solve these problems, the revised universal soil loss equation (RUSLE) and Geodetector method were used in a dry temperate (DT), dry warm (DW), and dry hot (DH) valley. Results indicated that dry valleys suffer severe water erosion with a value of 64.78, 43.85, and 33.81 t·ha−1·yr−1. The Geodetector method is proven to be an efficient tool to quantify the dominant factor of water erosion. It was established that land use types (LUT) have the closest relationship with water erosion. The controls for water erosion could be better explained by multi-factor interactions analysis, particularly for the combination of slope and LUT in DW (q = 0.71) and DH (q = 0.66). Additionally, regions at high risk of water erosion were characterized by steep slope (>30°) and low vegetation coverage (<50%) in DT, while the opposite is shown in DH. These findings could provide insight for guiding soil erosion management and ecological restoration strategies that balance economic and environmental sustainability.

scholarly journals Impacts of climate and vegetation on actual evapotranspiration in typical arid mountainous regions using a Budyko-Based framework

2020 ◽  
Author(s):  
Yuanhui Yu ◽  
Yuyan Zhou ◽  
Weihua Xiao ◽  
Benqing Ruan ◽  
Fan Lu ◽  
...  
Keyword(s):  
Climatic Factor ◽  
Actual Evapotranspiration ◽  
Vegetation Coverage ◽  
Dominant Factor ◽  
Contributing Factors ◽  
Mountainous Regions ◽  
Production Improvement ◽  
Negative Effect ◽  
Reservoir Watershed ◽  
Seasonal Index

Abstract It is important to understand how actual evapotranspiration (ETa) changes and what the dominant contributing factors are. This study investigated the impacts of climatic factor and vegetation coverage on the variations of ETa using a Budyko-based framework. Climatic seasonal index and vegetation coverage index were selected as indicating factors. Two reservoir watersheds, i.e. the Wangkuai Reservoir Watershed and the Xidayang Reservoir Watershed, of the Daqing River Basin were selected as case studies. Also, relationships between the ETa and climatic and vegetation factors were analyzed. Results showed that the improved vegetation conditions positively contributed to the ETa changes, leading to an increase of 42.15 and 58.56 mm of ETa in the two watersheds, while the increasing climate seasonality had a negative effect, resulting in a drop of 11.48 and 13.47 mm of ETa. Vegetation coverage was recognized as the dominant factor to the changes of ETa, compared to the climatic factor. Our research could offer supporting information for water resources management, agricultural production improvement and eco-environment construction in arid regions.

scholarly journals Overland Flow Resistance Law under Sparse Stem Vegetation Coverage

Water ◽  
2021 ◽  
Vol 13 (12) ◽  
pp. 1657
Author(s):  
Jingzhou Zhang ◽  
Shengtang Zhang ◽  
Si Chen ◽  
Ming Liu ◽  
Xuefeng Xu ◽  
...  
Keyword(s):  
Flow Resistance ◽  
Overland Flow ◽  
Vegetation Coverage ◽  
Dominant Factor ◽  
Roughness Coefficient ◽  
Hydraulic Parameters ◽  
Slope Condition ◽  
Manning Roughness ◽  
The Relationship ◽  
Manning Roughness Coefficient

To explore the characteristics of overland flow resistance under the condition of sparse vegetative stem coverage and improve the basic theoretical research of overland flow, the resistance characteristics of overland flow were systematically investigated under four slope gradients (S), seven flow discharges (Q), and six degrees of vegetation coverage (Cr). The results show that the Manning roughness coefficient (n) changes with the ratio of water depth to vegetation height (h/hv) while the Reynolds number (Re), Froude number (Fr), and slope (S) are closely related to vegetation coverage. Meanwhile, h/hv, Re, and Cr have strong positive correlations with n, while Fr and S have strong negative correlations with n. Through data regression analysis, a power function relationship between n and hydraulic parameters was observed and sensitivity analysis was performed. It was concluded that the relationship between n and h/hv, Re, Cr, Q, and S shows the same law; in particular, for sparse stem vegetation coverage, Cr is the dominant factor affecting overland flow resistance under zero slope condition, while Cr is no longer the first dominant factor affecting overland flow resistance under non-zero slope condition. In the relationship between n and Fr, Cr has the least effect on overland flow resistance. This indicates that when Manning roughness coefficient is correlated with different hydraulic parameters, the same vegetation coverage has different effects on overland flow resistance. Therefore, it is necessary to study overland flow resistance under the condition of sparse stalk vegetation coverage.

scholarly journals Hubungan Kualitas Pelayanan Dimensi Servqual dengan Loyalitas Pasien di Poliklinik RSUD Arosuka Tahun 2018

2019 ◽  
Vol 19 (3) ◽  
pp. 694
Author(s):  
Titen Yasril ◽  
Dachriyanus Dachriyanus ◽  
Harmawati Harmawati
Keyword(s):  
Sampling Technique ◽  
Dominant Factor ◽  
Chi Square ◽  
Waiting Room ◽  
Cross Sectional ◽  
Old Patients ◽  
A Value ◽  
Patient Loyalty ◽  
Chi Square Test ◽  
The Cost

The lack of repeated visits of old patients will increase the cost of promotion to get new patients, one way to maintain old patients is to grow patient loyalty. Some patients in Arosuka General Hospital are still not loyal because they come to the hospital only for the first examination, then the patient goes to another hospital, some patients have not recommended the hospital to others, one of the factors that influence patient loyalty is the quality of service. This study aims to determine the relationship between service quality servqual dimensions and patient loyalty in Arosuka Hospital. The type of this study is cross sectional. The population in this study were all patients who came to the Arosuka Hospital polyclinic in 2018, a sample of 203 people with a proportional random sampling sampling technique conducted in April 2018 with the analysis used was the chi square test. The statistical test results obtained 60.1% of respondents not loyal, 61.6% of respondents stated that tangible was not good, 37.9% of respondents stated that reliability was not good, 51.2% of respondents stated that they were less responsive, 43.3% of respondents said assurace was not good, and 48.8% of respondents said empaty not good. There is a significant relationship between tangible, reliability, responsive, assurance, empathy and patient loyalty in Arosuka Hospital with a value of p <0.05 (p = 0.001, p = 0.015, p = 0.010, p = 0.002, p = 0.022). Tangible is the most dominant factor associated with patient loyalty. It is expected that the director will make a policy on service hours, sanctions for those who do not obey the service hours, coordinate with the local government in procuring transportation for patients, the head of the ward designing a comfortable waiting room, and providing suggestion boxes for patients.

scholarly journals Near-surface internal melting: a substantial mass loss on Antarctic Dry Valley glaciers

2014 ◽  
Vol 60 (220) ◽  
pp. 361-374 ◽  
Author(s):  
Matthew J. Hoffman ◽  
Andrew G. Fountain ◽  
Glen E. Liston
Keyword(s):  
Meteorological Data ◽  
Primary Source ◽  
Balance Model ◽  
Weathering Crust ◽  
Field Observations ◽  
Dry Valleys ◽  
Near Surface ◽  
Ice Surface ◽  
Dry Valley ◽  
Glacier Ablation

AbstractThe McMurdo Dry Valleys, southern Victoria Land, East Antarctica, are a polar desert, and melt from glacial ice is the primary source of water to streams, lakes and associated ecosystems. Previous work found that to adequately model glacier ablation and subsurface ice temperatures with a surface energy-balance model required including the transmission of solar radiation into the ice. Here we investigate the contribution of subsurface melt to the mass balance of (and runoff from) Dry Valley glaciers by including a drainage process in the model and applying the model to three glacier sites using 13 years of hourly meteorological data. Model results for the smooth glacier surfaces common to many glaciers in the Dry Valleys showed that sublimation was typically the largest component of surface lowering, with rare episodes of surface melting, consistent with anecdotal field observations. Results also showed extensive internal melting 5–15 cm below the ice surface, the drainage of which accounted for ~50% of summer ablation. This is consistent with field observations of subsurface streams and formation of a weathering crust. We identify an annual cycle of weathering crust formation in summer and its removal during the 10 months of winter sublimation.

scholarly journals ANALISIS KUALITAS MANAJER PROYEK TERHADAP PELAKSANAAN PROYEK KONSTRUKSI (STUDI KASUS : DI DENPASAR DAN BADUNG)

2017 ◽  
Vol 5 (1) ◽  
Author(s):  
I Gde Eka Dharsika ◽  
IN Budiartha ◽  
I W Yansen
Keyword(s):  
Construction Projects ◽  
Linear Regression Analysis ◽  
Construction Project ◽  
Project Managers ◽  
Project Manager ◽  
Project Work ◽  
Dominant Factor ◽  
Labor Costs ◽  
A Value

Abstract: Problems in construction projects caused by the extension of working time and an increase in labor costs. A limited ability of project management contribute to the decline in the quality of project work. The quality of project manager has an important role to smooth a construction project. Dedication in this profession requires project managers to carry out the work going according to plan. Analyzing the quality of the project manager for the implementation of construction projectsis one wayto measure the quality of a project. It needs  a right measurements way to providean accurate assessment of qualified and reliable project managers. This study aimed to obtain and analyze the factors that affect the quality of the project manager and its to construction projects.This used a sample of 45 respondents from several construction projects in the area of Badung and Denpasar during the period 2007-2012. The method used in this study is the method of multiple linear regression analysis by testing for the F-test and t-test. The results found 8 dominant factor that has a value eigen values??> 1. Sequentially, the factors that have been named are experience 41.63%,  education 9.278%, knowledge 7.240%, ability 5.088%, character 4.047%, network 3.843%, relationship communication 3.550%, confidence 3.357%. Influence the quality of the project manager on the performance fee of 51.9%, against 43.1% for quality performance, on-time performance, with a value of 57.9%. The results of this study prove that the powerful influence between the quality of the construction project manager to the implementation of construction projects.

scholarly journals Analysis of the Changes in the Water Yield Coefficient over the Past 50 Years in the Huang-Huai-Hai River Basin, China

2018 ◽  
Vol 2018 ◽  
pp. 1-20 ◽  
Author(s):  
Xiaoqing Shi ◽  
Tianling Qin ◽  
Denghua Yan ◽  
Ruochen Sun ◽  
Shuang Cao ◽  
...  
Keyword(s):  
Land Use ◽  
River Basin ◽  
Vegetation Index ◽  
Yellow River ◽  
Rate Of Change ◽  
Vegetation Coverage ◽  
Water Yield ◽  
Yield Coefficient ◽  
Positive Trend ◽  
Land Use Types

This study analysed the temporal and spatial changes in the water yield coefficient (WYC), which represents the ratio of the gross amount of water resources to precipitation. Factors such as precipitation, rainstorm days, rainless days, vegetation cover change, and land use/cover change were considered to determine the causes of these changes. The results led to the following conclusions: (1) The average annual WYC of the Huang-Huai-Hai River Basin is between 0.03 and 0.58, with an average value of 0.17, which is smaller than the national average WYC of 0.4. (2) Temporally, the WYC varied slightly, with the western part showing a negative trend and the eastern part showing a positive trend. The WYC is positively correlated with precipitation, rainstorm days, and the normalized difference vegetation index (NDVI) and negatively correlated with rainless days. However, a slower change in NDVI produced a faster change in WYC. In areas with land use types exhibiting a large evapotranspiration decrease, the rate of change in the WYC increased. (3) Spatially, the distribution is fairly regular, exhibiting a gradual increase from the northern part of the Yellow River Basin (WYC < 0.1) to the surrounding areas. When the WYC is correlated with precipitation, rainstorm days, rainless days, and NDVI, the R2 values of the linear fitting results are 0.98, 0.91, 0.96, and 0.73, respectively. The WYC is positively correlated with precipitation, rainstorm days, and vegetation coverage and negatively correlated with rainless days, but the correlation coefficient is greatly influenced by the precipitation characteristics and land use types. In areas featuring high proportions of land use types associated with high evapotranspiration, the average WYC is low.

scholarly journals Assessment of soil erosion in the Dongting Lake Basin, China: Patterns, drivers, and implications

PLoS ONE ◽  
2021 ◽  
Vol 16 (12) ◽  
pp. e0261842
Author(s):  
Jianyong Xiao ◽  
Binggeng Xie ◽  
Kaichun Zhou ◽  
Shana Shi ◽  
Junhan Li ◽  
...  
Keyword(s):  
Climate Change ◽  
Land Use ◽  
Soil Erosion ◽  
Human Activities ◽  
Dongting Lake ◽  
Vegetation Coverage ◽  
Lake Basin ◽  
Driving Mechanism ◽  
Land Use Types ◽  
Key Factor

Soil loss caused by erosion is a global problem. Therefore, the assessment of soil erosion and the its driving mechanism are of great significance to soil conservation. However, soil erosion is affected by both climate change and human activities, which have not been quantified, and few researchers studied the differences in the driving mechanisms of soil erosion depending on the land use type. Therefore, the spatiotemporal characteristics and changing trends of soil erosion in the Dongting Lake Basin were analyzed in this study. Geographic detectors were used to identify the dominant factors affecting soil erosion in different land use types. In this study, a sensitivity experiment was conducted to clarify the relative contributions of climate change and human activities to soil erosion changes. In addition, we studied the effects of different land use types and vegetation cover restoration on soil erosion. The results show that soil erosion in the Dongting Lake Basin decreased from 2000 to 2018. Human activities represented by land use types and vegetation coverage significantly contributed to the alleviation of soil erosion in the Dongting Lake Basin, whereas climate change represented by rainfall slightly aggravated soil erosion in the study area. The restoration of grassland vegetation and transfer of cultivated land to woodlands in the study area improved the soil erosion. The slope steepness is the key factor affecting the intensity of soil erosion in dry land, paddy fields, and unused land, whereas the vegetation coverage is the key factor affecting the intensity of soil erosion in woodland, garden land, and grassland. Detailed spatiotemporally mapping of soil erosion was used to determine the connections between soil erosion and potential drivers, which have important implications for vegetation restoration and the optimization of land use planning.

scholarly journals Experimental Comparison of Straight Flanging and Rotary Die Bending Based on Springback

2021 ◽  
Author(s):  
Haydar Livatyali ◽  
Salih Emrah Turan ◽  
Feriha Birol ◽  
Mevlüt Türköz
Keyword(s):  
Rolling Direction ◽  
Dominant Factor ◽  
Experimental Comparison ◽  
Steel Sheets ◽  
430 Stainless Steel ◽  
Method Effects ◽  
Home Appliance ◽  
Full Factorial Experimental Design ◽  
Factor Interactions ◽  
Geometric Variation

Abstract Springback in sheet bending is a well-defined phenomenon; however, variation of springback is difficult to control causing quality problems in especially mass-produced goods such as home appliances. As an alternative to straight flanging, the rotary die bending process offers reduced springback as well as reduced geometric variation; however, there is little knowledge in the literature. The effects of process parameters on the springback behavior of straight flanging and rotary die bending as applied to home appliance side panels are investigated experimentally. For each flange bending method, effects of die radius, punch-die clearance, rolling direction, flange length, and material supplier on springback are tested on EN DC01 carbon and SAE 430 stainless steel sheets. A full factorial experimental design was applied to investigate the factor interactions as well as the main effects using ANOVA. In both methods, die radius was the most dominant factor on springback, clearance being the second, and the inevitable material property variations being the third one. Nevertheless, in rotary die bending, springback values were smaller with significantly less scatter compared to straight flanging. Consequently, rotary die bending is a much more preferable process especially in mass production performed with narrow profit margins.

scholarly journals PENGARUH KUALITAS PELAYANAN (ASPEK FISIK, KEANDALAN, INTERAKSI PRIBADI, PEMECAHAN MASALAH, DAN KEBIJAKAN) TERHADAP KEPUASAN KONSUMEN MIROTA KAMPUS DI YOGYAKARTA

2014 ◽  
Vol 4 (1) ◽  
pp. 41
Author(s):  
Wisnu Suryono ◽  
Hendro Setyono
Keyword(s):  
Problem Solving ◽  
Customer Satisfaction ◽  
Statistical Data ◽  
T Test ◽  
Test Reliability ◽  
Dominant Factor ◽  
A Value ◽  
Personal Interaction ◽  
Quality Dimension ◽  
Interaction Problem

This study aims to determine whether that service quality dimension in the physical aspects, reliability, personal interaction, problem solving and policy affects customer satisfaction supermarket Mirota Campus in Yogyakarta and analyze the most dominant factor in influencing customer satisfaction Supermarket Mirota Campus. The population in this study are consumers/customers supermarket Mirota Campus. Samples taken as many as 300 respondents by using incidental sampling and purposive sampling. Based on the analysis of statistical data, indicators in this study are valid and are reliable variables. The sequence individually from each of the most influential variables is the variable with the problem-solving test value t for 5.608, the personal interaction with the t test value of 4.826, followed by policy variables with a value of 3.845 t test and physical aspects variables with the value of the t test for 2.595, whereas the lowest variable that is variable with a value of t-test reliability sebesar 1.886.

scholarly journals The factors correlated to nurses’ decision activating code blue team in hospital

2021 ◽  
Vol 10 (1) ◽  
pp. 202
Author(s):  
Ekwantoro Ekwantoro ◽  
Kuswantoro Rusca Putra ◽  
Setyoadi Setyoadi
Keyword(s):  
Decision Making ◽  
Organizational Culture ◽  
Dominant Factor ◽  
P Value ◽  
Cross Sectional ◽  
Cultural Organization ◽  
Code Blue ◽  
A Value ◽  
Government Hospitals ◽  
Test Result

The success and hindrances of the blue-code activation were based on nurses’ readiness to request assistance once a patient’s clinical condition decreases. This research aimed to determine the nurses’ hindrance factors in making the blue code activation at hospitals. This research is analytical-observational with a cross-sectional approach. The samples consisted of 93 nurses taken randomly. The data were collected by questionnaire from March until April 2020 at one of the Nganjuk Government Hospitals. The Pearson test result showed a correlation between experience with p-value 0.022, education with a p-value 0.000, cognition with p-value 0.006, and organizational culture with a p-value 0.000 toward decision-making (p-value&lt;0.05). The multiple linear regression multivariate analysis shows an Exp. value (B) of education is 0.292, experience with a value 0.178, cognition with a value 0.194, and cultural organization with a score of 0.425. Thus, it could be concluded that the organizational culture was the most dominant factor of the nurses’ decision making. The hindrances and success of the nurses’ decision-making are based on the nurses’ characteristics, such as cognition, communication skill, and collaboration skill. The support from the leader of an organization would influence nurses’ confidence dealing with patients’ health.

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