Assessment of groundwater salinization using PEST and sensitivity analysis: case of Zeuss-Koutine and Mio-Plio-Quaternary aquifers

2020 ◽  
Vol 13 (19) ◽  
Author(s):  
Hanen Jarray ◽  
Mounira Zammouri ◽  
Mohamed Ouessar
Keyword(s):  
Sensitivity Analysis ◽  
Groundwater Salinization ◽  
Quaternary Aquifers

scholarly journals Hydrochemical and isotopic evidences for deciphering conceptual model of groundwater salinization processes in a coastal plain, north China

2017 ◽  
Author(s):  
Dongmei Han
Keyword(s):  
Surface Water ◽  
Coastal Plain ◽  
Saltwater Intrusion ◽  
North China ◽  
Anthropogenic Activities ◽  
Geothermal Water ◽  
Return Flow ◽  
Groundwater Salinization ◽  
Well Field ◽  
Quaternary Aquifers

Abstract. Groundwater is the important water resource for agricultural irrigation, urban and tourism development and industrial utilization in the coastal region of north China. In the past five decades, coastal groundwater salinization in the Yang-Dai River coastal plain has become more serious than ever before under natural climate change and anthropogenic activities. It is pivotal for the scientific management of coastal water resources to accurately understand groundwater salinization processes and its inducement. Hydrochemical and stable isotopic (δ18O and δ2H) analysis for the different water bodies (surface water, groundwater, geothermal water, and seawater) were applied to provide a better understanding of the processes of groundwater salinization in the Quaternary aquifers. Saltwater intrusion is the major aspect and can be caused by vertical infiltration along the riverbed at the downstream areas of rivers during the tide/surge period, and lateral inflow into fresh aquifer derived from intensively pumping groundwater. Seawater proportion can reach ~ 13 % in the well field. High mineralized geothermal water (TDS up to 10.6 g/L) with the indicator of paleoseawater relics (lower Cl / Br ratios relative to modern seawater) overflows into the cold Quaternary aquifers. Groundwater salinization can also be exacerbated by the anthropogenic activities (e.g., irrigation return-flow with solution of fertilizers, domestic wastewater discharge). Additionally, the interaction between surface water and groundwater can make the groundwater freshening or salinizing in different sections to locally modify the groundwater hydrochemistry. The cease of the well field and establishment of anti-tide dam in the Yang River estuary area have effective function to contain the development of saltwater intrusion. This study can guide the future water management practices, and provide research approaches and foundation for further investigation of seawater intrusion in this and similar region.

Aplikasi Metode Hungarian Dalam Optimalisasi Waktu Penugasan Karyawan dan Keuntungan Produksi Home Industry

2019 ◽  
Vol 2 (2) ◽  
Author(s):  
Empya Charlie ◽  
Siti Rusdiana ◽  
Rini Oktavia
Keyword(s):  
Sensitivity Analysis ◽  
Optimal Solution ◽  
Optimal Scheduling ◽  
Total Work ◽  
Work Time ◽  
Hungarian Method ◽  
Total Work Time

Penelitian ini bertujuan untuk mengoptimalkan penjadwalan karyawan di CV. Karya Indah Bordir dalam melakukan tugas-tugas tertentu menggunakan metode Hungaria, serta menganalisis sensitivitas solusi optimal jika ada pengurangan waktu karyawan untuk menyelesaikan tugas-tugas. Metode Hongaria diterapkan pada proses bordir yang melibatkan 11 karyawan dan 10 tugas. Hasil penjadwalan yang optimal meminimalkan waktu produksi bordir perusahaan. Hasil penjadwalan optimal yang ditemukan adalah: karyawan 1 mengerjakan tas Mambo, karyawan 2 mengerjakan tas Elli, karyawan 3 mengerjakan tas Lonjong, karyawan 4 mengerjakan tas Tampang bunga, karyawan 6 mengerjakan tas Ransel, karyawan 7 mengerjakan tas Tima, karyawan 8 mengerjakan tas Keong, karyawan 9 mengerjakan tas Alexa, karyawan 10 mengerjakan tas Luna, dan karyawan 11 mengerjakan tas Mikha, dengan total waktu kerja adalah 13,7 jam. Setelah metode Hongaria diterapkan, CV. Karya Indah Bordir mendapat peningkatan pendapatan sebanyak 9,09%. Analisis sensitivitas dilakukan dengan mengurangi waktu karyawan dalam menyulam tas. Hasil analisis sensitivitas adalah beberapa batasan untuk variabel basis dan non basis untuk mempertahankan solusi optimal.   This research has a purpose to optimize the scheduling of employees in CV. Karya Indah Bordir in doing certain tasks using Hungarian method, as well as analyzing the sensitivity of the optimal solution if there is a reduction on the employees time to finish the tasks. The Hungarian method was applied on the embroidery process involving 11 employees and 10 tasks. The optimal scheduling result minimize the time of the embroidery production of the company. The optimal scheduling result found is: employee 1 does the Mambo bag, employee 2 does the Elli bag, employee 3 does the Lonjong bag, employee 4 does the Tampang bunga bag, employee 6 does the Ransel, employee 7 does the Tima bag, employee 8 does the Keong bag, employee 9 does the Alexa bag, employees 10 does the Luna bag, and employee 11 does the Mikha bag, with the total work time is 13,7 hours. After the Hungarian method was applied, CV. Karya Indah Bordir got the increasing revenue as much as 9,09 %. The sensitivity analysis was conducted by reducing the time of the employees take in embroidery the bags. The results of the sensitivity analysis are some boundaries for basis and non basis variables to maintain the optimal solution. 

Sensitivity Analysis and Selection of Check Index of Signal Intersection Simulation Model Based on VISSIM

2019 ◽  
Vol 2 (5) ◽  
Author(s):  
Mengda Zhang ◽  
Chenjing Zhou ◽  
Tian-tian Zhang ◽  
Yan Han
Keyword(s):  
Sensitivity Analysis ◽  
Simulation Model ◽  
Optimal Process ◽  
Parameter Calibration ◽  
Index Set ◽  
The Core ◽  
Core Module ◽  
Simulation Parameter ◽  
Simulation Parameters ◽  
Selection Of

Selecting check index quantitatively is the core of the calibration of micro traffic simulation parameters at signal intersection. Five indexes in the node (intersection) module of VISSIM were selected as the check index set. Twelve simulation parameters in the core module were selected as the simulation parameters set. Optimal process of parameter calibration was proposed and model of the intersection of Huangcun west street and Xinghua street in Beijing was built in VISSIM to verify it. The sensitivity analysis between each check index and simulation parameter in their own set was conducted respectively. Sensitive parameter sets of different check indices were obtained and compared. The results show that different indexes have different size of set, and average vehicle delay's is maximum, so it's necessary to select index quantitatively. The results can provide references for scientific selection of the check indexes and improve the study efficiency of parameter calibration.

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